t t analog signal digital signal - nptel · 2017. 8. 4. · digital circuits t t analog signal 0 1...
TRANSCRIPT
![Page 1: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/1.jpg)
Digital circuits
t t
analog signal
0
1high
low
digital signal
* An analog signal x(t) is represented by a real number at a given time point.
* A digital signal is “binary” in nature, i.e., it takes on only two values: low (0) or high (1).
* Although we have shown 0 and 1 as constant levels, in reality, that is not required. Any value in the low(high) band will be interpreted as 0 (1) by digital circuits.
* The definition of low and high bands depends on the technology used, e.g.,
TTL (Transitor-Transitor Logic)
CMOS (Complementary MOS)
ECL (Emitter-Coupled Logic)
M. B. Patil, IIT Bombay
![Page 2: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/2.jpg)
Digital circuits
t t
analog signal
0
1high
low
digital signal
* An analog signal x(t) is represented by a real number at a given time point.
* A digital signal is “binary” in nature, i.e., it takes on only two values: low (0) or high (1).
* Although we have shown 0 and 1 as constant levels, in reality, that is not required. Any value in the low(high) band will be interpreted as 0 (1) by digital circuits.
* The definition of low and high bands depends on the technology used, e.g.,
TTL (Transitor-Transitor Logic)
CMOS (Complementary MOS)
ECL (Emitter-Coupled Logic)
M. B. Patil, IIT Bombay
![Page 3: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/3.jpg)
Digital circuits
t t
analog signal
0
1high
low
digital signal
* An analog signal x(t) is represented by a real number at a given time point.
* A digital signal is “binary” in nature, i.e., it takes on only two values: low (0) or high (1).
* Although we have shown 0 and 1 as constant levels, in reality, that is not required. Any value in the low(high) band will be interpreted as 0 (1) by digital circuits.
* The definition of low and high bands depends on the technology used, e.g.,
TTL (Transitor-Transitor Logic)
CMOS (Complementary MOS)
ECL (Emitter-Coupled Logic)
M. B. Patil, IIT Bombay
![Page 4: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/4.jpg)
Digital circuits
t t
analog signal
0
1high
low
digital signal
* An analog signal x(t) is represented by a real number at a given time point.
* A digital signal is “binary” in nature, i.e., it takes on only two values: low (0) or high (1).
* Although we have shown 0 and 1 as constant levels, in reality, that is not required. Any value in the low(high) band will be interpreted as 0 (1) by digital circuits.
* The definition of low and high bands depends on the technology used, e.g.,
TTL (Transitor-Transitor Logic)
CMOS (Complementary MOS)
ECL (Emitter-Coupled Logic)
M. B. Patil, IIT Bombay
![Page 5: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/5.jpg)
Digital circuits
t t
analog signal
0
1high
low
digital signal
* An analog signal x(t) is represented by a real number at a given time point.
* A digital signal is “binary” in nature, i.e., it takes on only two values: low (0) or high (1).
* Although we have shown 0 and 1 as constant levels, in reality, that is not required. Any value in the low(high) band will be interpreted as 0 (1) by digital circuits.
* The definition of low and high bands depends on the technology used, e.g.,
TTL (Transitor-Transitor Logic)
CMOS (Complementary MOS)
ECL (Emitter-Coupled Logic)
M. B. Patil, IIT Bombay
![Page 6: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/6.jpg)
A simple digital circuit
0 1 2 3 4 5
1
2
3
4
5
0
RB
RC
Vo
VCC
Vi
Vo(Volts)
Vi (Volts)
5 V
* If Vi is low (“0”), Vo is high (“1”).If Vi is high (“1”), Vo is low (“0”).
* The circuit is called an “inverter” because it inverts the logic level of the input. If the input is 0, it makesthe output 1, and vice versa.
* Digital circuits are made using a variety of devices. The simple BJT inverter is only an illustration.
* Most of the VLSI circuits today employ the MOS technology because of the high packing density, highspeed, and low power consumption it offers.
M. B. Patil, IIT Bombay
![Page 7: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/7.jpg)
A simple digital circuit
0 1 2 3 4 5
1
2
3
4
5
0
RB
RC
Vo
VCC
Vi
Vo(Volts)
Vi (Volts)
5 V
* If Vi is low (“0”), Vo is high (“1”).If Vi is high (“1”), Vo is low (“0”).
* The circuit is called an “inverter” because it inverts the logic level of the input. If the input is 0, it makesthe output 1, and vice versa.
* Digital circuits are made using a variety of devices. The simple BJT inverter is only an illustration.
* Most of the VLSI circuits today employ the MOS technology because of the high packing density, highspeed, and low power consumption it offers.
M. B. Patil, IIT Bombay
![Page 8: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/8.jpg)
A simple digital circuit
0 1 2 3 4 5
1
2
3
4
5
0
RB
RC
Vo
VCC
Vi
Vo(Volts)
Vi (Volts)
5 V
* If Vi is low (“0”), Vo is high (“1”).If Vi is high (“1”), Vo is low (“0”).
* The circuit is called an “inverter” because it inverts the logic level of the input. If the input is 0, it makesthe output 1, and vice versa.
* Digital circuits are made using a variety of devices. The simple BJT inverter is only an illustration.
* Most of the VLSI circuits today employ the MOS technology because of the high packing density, highspeed, and low power consumption it offers.
M. B. Patil, IIT Bombay
![Page 9: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/9.jpg)
A simple digital circuit
0 1 2 3 4 5
1
2
3
4
5
0
RB
RC
Vo
VCC
Vi
Vo(Volts)
Vi (Volts)
5 V
* If Vi is low (“0”), Vo is high (“1”).If Vi is high (“1”), Vo is low (“0”).
* The circuit is called an “inverter” because it inverts the logic level of the input. If the input is 0, it makesthe output 1, and vice versa.
* Digital circuits are made using a variety of devices. The simple BJT inverter is only an illustration.
* Most of the VLSI circuits today employ the MOS technology because of the high packing density, highspeed, and low power consumption it offers.
M. B. Patil, IIT Bombay
![Page 10: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/10.jpg)
A simple digital circuit
0 1 2 3 4 5
1
2
3
4
5
0
RB
RC
Vo
VCC
Vi
Vo(Volts)
Vi (Volts)
5 V
* If Vi is low (“0”), Vo is high (“1”).If Vi is high (“1”), Vo is low (“0”).
* The circuit is called an “inverter” because it inverts the logic level of the input. If the input is 0, it makesthe output 1, and vice versa.
* Digital circuits are made using a variety of devices. The simple BJT inverter is only an illustration.
* Most of the VLSI circuits today employ the MOS technology because of the high packing density, highspeed, and low power consumption it offers.
M. B. Patil, IIT Bombay
![Page 11: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/11.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 12: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/12.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 13: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/13.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 14: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/14.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 15: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/15.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 16: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/16.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 17: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/17.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.
- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 18: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/18.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 19: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/19.jpg)
Digital circuits
toriginal data
V1
tcorrupted data
V2
comparator
V3
V2
Vref
Vref
t
recovered data
V3
* A major advantage of digital systems is that, even if the original data gets distorted (e.g., in transmittingthrough optical fibre or storing on a CD) due to noise, attenuation, etc., it can be retrieved easily.
* There are several other benefits of using digital representation:
- can use computers to process the data.- can store in a variety of storage media.
- can program the functionality. For example, the behaviour of a digital filter can be changed simply
by changing its coefficients.
M. B. Patil, IIT Bombay
![Page 20: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/20.jpg)
Logical operations
Gate
Truth table
Notation
Operation NOT AND OR
10
01
YA
Y = A
A Y
1
1
1 1 1
0 0 0
0
0 0
0
A B Y
= AB
Y = A · B
B
AY
1
1
1 1 1
0 0 0
0
0
A B Y
1
1
Y = A+ B
A
BY
M. B. Patil, IIT Bombay
![Page 21: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/21.jpg)
Logical operations
Gate
Truth table
Notation
Operation NOT AND OR
10
01
YA
Y = A
A Y
1
1
1 1 1
0 0 0
0
0 0
0
A B Y
= AB
Y = A · B
B
AY
1
1
1 1 1
0 0 0
0
0
A B Y
1
1
Y = A+ B
A
BY
M. B. Patil, IIT Bombay
![Page 22: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/22.jpg)
Logical operations
Gate
Truth table
Notation
Operation NOT AND OR
10
01
YA
Y = A
A Y
1
1
1 1 1
0 0 0
0
0 0
0
A B Y
= AB
Y = A · B
B
AY
1
1
1 1 1
0 0 0
0
0
A B Y
1
1
Y = A+ B
A
BY
M. B. Patil, IIT Bombay
![Page 23: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/23.jpg)
Logical operations
Gate
Truth table
Notation
Operation NOT AND OR
10
01
YA
Y = A
A Y
1
1
1 1 1
0 0 0
0
0 0
0
A B Y
= AB
Y = A · B
B
AY
1
1
1 1 1
0 0 0
0
0
A B Y
1
1
Y = A+ B
A
BY
M. B. Patil, IIT Bombay
![Page 24: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/24.jpg)
Logical operations
Gate
Truth table
Notation
Operation NORNAND XOR
1
1
1 1
0 0
0
0
A B Y
1
1
1
0
Y = A · B= AB
YA
B
1
1
1 1
0 0
0
0 0
0
A B Y
1
0
Y = A+ B
B
AY
1
1
1 1
0 0 0
0
0
A B Y
1
1
0
Y = A⊕ B
= AB+ AB
A
BY
M. B. Patil, IIT Bombay
![Page 25: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/25.jpg)
Logical operations
Gate
Truth table
Notation
Operation NORNAND XOR
1
1
1 1
0 0
0
0
A B Y
1
1
1
0
Y = A · B= AB
YA
B
1
1
1 1
0 0
0
0 0
0
A B Y
1
0
Y = A+ B
B
AY
1
1
1 1
0 0 0
0
0
A B Y
1
1
0
Y = A⊕ B
= AB+ AB
A
BY
M. B. Patil, IIT Bombay
![Page 26: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/26.jpg)
Logical operations
Gate
Truth table
Notation
Operation NORNAND XOR
1
1
1 1
0 0
0
0
A B Y
1
1
1
0
Y = A · B= AB
YA
B
1
1
1 1
0 0
0
0 0
0
A B Y
1
0
Y = A+ B
B
AY
1
1
1 1
0 0 0
0
0
A B Y
1
1
0
Y = A⊕ B
= AB+ AB
A
BY
M. B. Patil, IIT Bombay
![Page 27: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/27.jpg)
Logical operations
Gate
Truth table
Notation
Operation NORNAND XOR
1
1
1 1
0 0
0
0
A B Y
1
1
1
0
Y = A · B= AB
YA
B
1
1
1 1
0 0
0
0 0
0
A B Y
1
0
Y = A+ B
B
AY
1
1
1 1
0 0 0
0
0
A B Y
1
1
0
Y = A⊕ B
= AB+ AB
A
BY
M. B. Patil, IIT Bombay
![Page 28: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/28.jpg)
Logical operations
* The AND operation is commutative.
→ A · B = B · A.
* The AND operation is associative.
→ (A · B) · C = A · (B · C).
* The OR operation is commutative.
→ A + B = B + A.
* The OR operation is associative.
→ (A + B) + C = A + (B + C).
M. B. Patil, IIT Bombay
![Page 29: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/29.jpg)
Logical operations
* The AND operation is commutative.
→ A · B = B · A.
* The AND operation is associative.
→ (A · B) · C = A · (B · C).
* The OR operation is commutative.
→ A + B = B + A.
* The OR operation is associative.
→ (A + B) + C = A + (B + C).
M. B. Patil, IIT Bombay
![Page 30: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/30.jpg)
Logical operations
* The AND operation is commutative.
→ A · B = B · A.
* The AND operation is associative.
→ (A · B) · C = A · (B · C).
* The OR operation is commutative.
→ A + B = B + A.
* The OR operation is associative.
→ (A + B) + C = A + (B + C).
M. B. Patil, IIT Bombay
![Page 31: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/31.jpg)
Logical operations
* The AND operation is commutative.
→ A · B = B · A.
* The AND operation is associative.
→ (A · B) · C = A · (B · C).
* The OR operation is commutative.
→ A + B = B + A.
* The OR operation is associative.
→ (A + B) + C = A + (B + C).
M. B. Patil, IIT Bombay
![Page 32: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/32.jpg)
Boolean algebra (George Boole, 1815-1864)
* Theorem: A = A.
The theorem can be proved by constructing a truth table:
A A A
0 1 0
1 0 1
Therefore, for all possible values that A can take (i.e., 0 and 1), A is the same as A.
⇒ A = A.
* Similarly, the following theorems can be proved:
A + 0 = A A · 1 = A
A + 1 = 1 A · 0 = 0
A + A = A A · A = A
A + A = 1 A · A = 0
Note the duality: (+←→ ·) and (1←→ 0).
M. B. Patil, IIT Bombay
![Page 33: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/33.jpg)
Boolean algebra (George Boole, 1815-1864)
* Theorem: A = A.
The theorem can be proved by constructing a truth table:
A A A
0 1 0
1 0 1
Therefore, for all possible values that A can take (i.e., 0 and 1), A is the same as A.
⇒ A = A.
* Similarly, the following theorems can be proved:
A + 0 = A A · 1 = A
A + 1 = 1 A · 0 = 0
A + A = A A · A = A
A + A = 1 A · A = 0
Note the duality: (+←→ ·) and (1←→ 0).
M. B. Patil, IIT Bombay
![Page 34: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/34.jpg)
Boolean algebra (George Boole, 1815-1864)
* Theorem: A = A.
The theorem can be proved by constructing a truth table:
A A A
0 1 0
1 0 1
Therefore, for all possible values that A can take (i.e., 0 and 1), A is the same as A.
⇒ A = A.
* Similarly, the following theorems can be proved:
A + 0 = A A · 1 = A
A + 1 = 1 A · 0 = 0
A + A = A A · A = A
A + A = 1 A · A = 0
Note the duality: (+←→ ·) and (1←→ 0).
M. B. Patil, IIT Bombay
![Page 35: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/35.jpg)
Boolean algebra (George Boole, 1815-1864)
* Theorem: A = A.
The theorem can be proved by constructing a truth table:
A A A
0 1 0
1 0 1
Therefore, for all possible values that A can take (i.e., 0 and 1), A is the same as A.
⇒ A = A.
* Similarly, the following theorems can be proved:
A + 0 = A A · 1 = A
A + 1 = 1 A · 0 = 0
A + A = A A · A = A
A + A = 1 A · A = 0
Note the duality: (+←→ ·) and (1←→ 0).
M. B. Patil, IIT Bombay
![Page 36: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/36.jpg)
Boolean algebra (George Boole, 1815-1864)
* Theorem: A = A.
The theorem can be proved by constructing a truth table:
A A A
0 1 0
1 0 1
Therefore, for all possible values that A can take (i.e., 0 and 1), A is the same as A.
⇒ A = A.
* Similarly, the following theorems can be proved:
A + 0 = A A · 1 = A
A + 1 = 1 A · 0 = 0
A + A = A A · A = A
A + A = 1 A · A = 0
Note the duality: (+←→ ·) and (1←→ 0).
M. B. Patil, IIT Bombay
![Page 37: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/37.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0
0 1 1 1 1 0 1 1
0 1
1 0 1 0 0 0 1 1
1 0
1 0 0 1 0 0 1 1
1 1
1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 38: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/38.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0
1 1 1 1 0 1 1
0 1 1
0 1 0 0 0 1 1
1 0 1
0 0 1 0 0 1 1
1 1 1
0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 39: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/39.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1
1 1 1 0 1 1
0 1 1 0
1 0 0 0 1 1
1 0 1 0
0 1 0 0 1 1
1 1 1 0
0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 40: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/40.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1
1 1 0 1 1
0 1 1 0 1
0 0 0 1 1
1 0 1 0 0
1 0 0 1 1
1 1 1 0 0
0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 41: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/41.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1
1 0 1 1
0 1 1 0 1 0
0 0 1 1
1 0 1 0 0 1
0 0 1 1
1 1 1 0 0 0
0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 42: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/42.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1
0 1 1
0 1 1 0 1 0 0
0 1 1
1 0 1 0 0 1 0
0 1 1
1 1 1 0 0 0 0
1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 43: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/43.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0
1 1
0 1 1 0 1 0 0 0
1 1
1 0 1 0 0 1 0 0
1 1
1 1 1 0 0 0 0 1
0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 44: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/44.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1
1
0 1 1 0 1 0 0 0 1
1
1 0 1 0 0 1 0 0 1
1
1 1 1 0 0 0 0 1 0
0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 45: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/45.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 46: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/46.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 47: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/47.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 48: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/48.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 49: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/49.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 50: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/50.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 51: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/51.jpg)
De Morgan’s theorems
A B A + B A + B A B A · B A · B A · B A + B
0 0 0 1 1 1 1 0 1 1
0 1 1 0 1 0 0 0 1 1
1 0 1 0 0 1 0 0 1 1
1 1 1 0 0 0 0 1 0 0
* Comparing the truth tables for A + B and AB, we conclude that A + B = AB.
* Similiarly, A · B = A + B.
* Similar relations hold for more than two variables, e.g.,
A · B · C = A + B + C ,
A + B + C + D = A · B · C · D,
(A + B) · C = (A + B) + C = A · B + C .
M. B. Patil, IIT Bombay
![Page 52: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/52.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0
0 0 0 0 0
0 0 1
1 0 0 0 0
0 1 0
1 0 0 0 0
0 1 1
1 0 0 0 0
1 0 0
0 0 0 0 0
1 0 1
1 1 0 1 1
1 1 0
1 1 1 0 1
1 1 1
1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 53: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/53.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0
0 0 0 0 0
0 0 1
1 0 0 0 0
0 1 0
1 0 0 0 0
0 1 1
1 0 0 0 0
1 0 0
0 0 0 0 0
1 0 1
1 1 0 1 1
1 1 0
1 1 1 0 1
1 1 1
1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 54: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/54.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0
0 0 0 0
0 0 1 1
0 0 0 0
0 1 0 1
0 0 0 0
0 1 1 1
0 0 0 0
1 0 0 0
0 0 0 0
1 0 1 1
1 0 1 1
1 1 0 1
1 1 0 1
1 1 1 1
1 1 1 1
M. B. Patil, IIT Bombay
![Page 55: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/55.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0 0
0 0 0
0 0 1 1 0
0 0 0
0 1 0 1 0
0 0 0
0 1 1 1 0
0 0 0
1 0 0 0 0
0 0 0
1 0 1 1 1
0 1 1
1 1 0 1 1
1 0 1
1 1 1 1 1
1 1 1
M. B. Patil, IIT Bombay
![Page 56: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/56.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0 0 0
0 0
0 0 1 1 0 0
0 0
0 1 0 1 0 0
0 0
0 1 1 1 0 0
0 0
1 0 0 0 0 0
0 0
1 0 1 1 1 0
1 1
1 1 0 1 1 1
0 1
1 1 1 1 1 1
1 1
M. B. Patil, IIT Bombay
![Page 57: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/57.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0 0 0 0
0
0 0 1 1 0 0 0
0
0 1 0 1 0 0 0
0
0 1 1 1 0 0 0
0
1 0 0 0 0 0 0
0
1 0 1 1 1 0 1
1
1 1 0 1 1 1 0
1
1 1 1 1 1 1 1
1
M. B. Patil, IIT Bombay
![Page 58: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/58.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0 0 0 0 0
0 0 1 1 0 0 0 0
0 1 0 1 0 0 0 0
0 1 1 1 0 0 0 0
1 0 0 0 0 0 0 0
1 0 1 1 1 0 1 1
1 1 0 1 1 1 0 1
1 1 1 1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 59: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/59.jpg)
Distributive laws
1. A · (B + C) = AB + AC .
A B C B + C A · (B + C) AB AC AB + AC
0 0 0 0 0 0 0 0
0 0 1 1 0 0 0 0
0 1 0 1 0 0 0 0
0 1 1 1 0 0 0 0
1 0 0 0 0 0 0 0
1 0 1 1 1 0 1 1
1 1 0 1 1 1 0 1
1 1 1 1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 60: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/60.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0
0 0 0 0 0
0 0 1
0 0 0 1 0
0 1 0
0 0 1 0 0
0 1 1
1 1 1 1 1
1 0 0
0 1 1 1 1
1 0 1
0 1 1 1 1
1 1 0
0 1 1 1 1
1 1 1
1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 61: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/61.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0
0 0 0 0 0
0 0 1
0 0 0 1 0
0 1 0
0 0 1 0 0
0 1 1
1 1 1 1 1
1 0 0
0 1 1 1 1
1 0 1
0 1 1 1 1
1 1 0
0 1 1 1 1
1 1 1
1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 62: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/62.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0
0 0 0 0
0 0 1 0
0 0 1 0
0 1 0 0
0 1 0 0
0 1 1 1
1 1 1 1
1 0 0 0
1 1 1 1
1 0 1 0
1 1 1 1
1 1 0 0
1 1 1 1
1 1 1 1
1 1 1 1
M. B. Patil, IIT Bombay
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Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0 0
0 0 0
0 0 1 0 0
0 1 0
0 1 0 0 0
1 0 0
0 1 1 1 1
1 1 1
1 0 0 0 1
1 1 1
1 0 1 0 1
1 1 1
1 1 0 0 1
1 1 1
1 1 1 1 1
1 1 1
M. B. Patil, IIT Bombay
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Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0 0 0
0 0
0 0 1 0 0 0
1 0
0 1 0 0 0 1
0 0
0 1 1 1 1 1
1 1
1 0 0 0 1 1
1 1
1 0 1 0 1 1
1 1
1 1 0 0 1 1
1 1
1 1 1 1 1 1
1 1
M. B. Patil, IIT Bombay
![Page 65: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/65.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0 0 0 0
0
0 0 1 0 0 0 1
0
0 1 0 0 0 1 0
0
0 1 1 1 1 1 1
1
1 0 0 0 1 1 1
1
1 0 1 0 1 1 1
1
1 1 0 0 1 1 1
1
1 1 1 1 1 1 1
1
M. B. Patil, IIT Bombay
![Page 66: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/66.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0 0 0 0 0
0 0 1 0 0 0 1 0
0 1 0 0 0 1 0 0
0 1 1 1 1 1 1 1
1 0 0 0 1 1 1 1
1 0 1 0 1 1 1 1
1 1 0 0 1 1 1 1
1 1 1 1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 67: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/67.jpg)
Distributive laws
2. A + B · C = (A + B) · (A + C).
A B C B C A + B C A + B A + C (A + B) (A + C)
0 0 0 0 0 0 0 0
0 0 1 0 0 0 1 0
0 1 0 0 0 1 0 0
0 1 1 1 1 1 1 1
1 0 0 0 1 1 1 1
1 0 1 0 1 1 1 1
1 1 0 0 1 1 1 1
1 1 1 1 1 1 1 1
M. B. Patil, IIT Bombay
![Page 68: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/68.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 69: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/69.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 70: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/70.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 71: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/71.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 72: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/72.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 73: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/73.jpg)
Useful theorems
* A + AB = A.
To prove this theorem, we can follow two approaches:
(a) Construct truth tables for LHS and RHS for all possible input combinations, and show that they arethe same.
(b) Use identities and theorems stated earlier to show that LHS=RHS.
A + AB = A · 1 + A · B= A · (1 + B)= A · (1)= A
* A · (A + B) = A.
Proof: A · (A + B) = A · A + A · B= A + AB= A
M. B. Patil, IIT Bombay
![Page 74: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/74.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 75: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/75.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 76: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/76.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 77: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/77.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 78: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/78.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 79: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/79.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 80: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/80.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 81: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/81.jpg)
Duality
A + AB = A ←→ A · (A + B) = A.
Note the duality between OR and AND.
Dual of A + (AB) (LHS): AB → A + BA + AB → A · (A + B).
Dual of A (RHS) = A (since there are no operations ivolved).
⇒ A · (A + B) = A.
Similarly, consider A + A = 1, with (+←→ .) and (1←→ 0).
Dual of LHS = A · A.
Dual of RHS = 0.
⇒ A · A = 0.
M. B. Patil, IIT Bombay
![Page 82: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/82.jpg)
Useful theorems
* A + AB = A + B.
Proof: A + AB = (A + A) · (A + B) (by distributive law)
= 1 · (A + B)
= A + B
Dual theorem: A · (A + B) = AB.
* AB + AB = A.
Proof: AB + AB = A · (B + B) (by distributive law)
= A · 1= A
Dual theorem: (A + B) · (A + B) = A.
M. B. Patil, IIT Bombay
![Page 83: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/83.jpg)
Useful theorems
* A + AB = A + B.
Proof: A + AB = (A + A) · (A + B) (by distributive law)
= 1 · (A + B)
= A + B
Dual theorem: A · (A + B) = AB.
* AB + AB = A.
Proof: AB + AB = A · (B + B) (by distributive law)
= A · 1= A
Dual theorem: (A + B) · (A + B) = A.
M. B. Patil, IIT Bombay
![Page 84: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/84.jpg)
Useful theorems
* A + AB = A + B.
Proof: A + AB = (A + A) · (A + B) (by distributive law)
= 1 · (A + B)
= A + B
Dual theorem: A · (A + B) = AB.
* AB + AB = A.
Proof: AB + AB = A · (B + B) (by distributive law)
= A · 1= A
Dual theorem: (A + B) · (A + B) = A.
M. B. Patil, IIT Bombay
![Page 85: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/85.jpg)
Useful theorems
* A + AB = A + B.
Proof: A + AB = (A + A) · (A + B) (by distributive law)
= 1 · (A + B)
= A + B
Dual theorem: A · (A + B) = AB.
* AB + AB = A.
Proof: AB + AB = A · (B + B) (by distributive law)
= A · 1= A
Dual theorem: (A + B) · (A + B) = A.
M. B. Patil, IIT Bombay
![Page 86: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/86.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 87: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/87.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 88: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/88.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 89: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/89.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 90: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/90.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 91: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/91.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 92: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/92.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 93: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/93.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 94: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/94.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 95: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/95.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 96: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/96.jpg)
A game of words
In an India-Australia match, India will win if one or more of the following conditions are met:
(a) Tendulkar scores a century.
(b) Tedulkar does not score a century AND Warne fails (to get wickets).
(c) Tedulkar does not score a century AND Sehwag scores a century.
Let T ≡ Tendulkar scores a century.
S ≡ Sehwag scores a century.
W ≡ Warne fails.
I ≡ India wins.
I = T + T W + T S
= T + T + T W + T S
= (T + T W ) + (T + T S)
= (T + T ) · (T + W ) + (T + T ) · (T + S)
= T + W + T + S
= T + W + S
i.e., India will win if one or more of the following hold:
(a) Tendulkar strikes, (b) Warne fails, (c) Sehwag strikes.
M. B. Patil, IIT Bombay
![Page 97: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/97.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 98: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/98.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 99: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/99.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 100: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/100.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 101: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/101.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 102: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/102.jpg)
Logical functions in standard forms
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C + AB C
≡ X1 + X2 + X3 + X4
This form is called the “sum of products” form (“sum” corresponding to ORand “product” corresponding to AND).
We can construct the truth table for X in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate X1 = AB C , etc. Note that X1 is 1 only if A=B =C = 1 (i.e., A= 0, B = 1, C = 0),and 0 otherwise.
(3) Since X = X1 + X2 + X3 + X4,X is 1 if any of X1, X2, X3, X4 is 1; else X is 0.→ tabulate X .
M. B. Patil, IIT Bombay
![Page 103: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/103.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 104: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/104.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 105: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/105.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 106: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/106.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 107: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/107.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 108: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/108.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 109: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/109.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 110: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/110.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 111: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/111.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 112: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/112.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 113: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/113.jpg)
“Sum of products” form
XCBA X4X3X2X1
X = X1 + X2 + X3 + X4 = ABC+ ABC+ ABC+ ABC
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
M. B. Patil, IIT Bombay
![Page 114: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/114.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 115: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/115.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 116: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/116.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 117: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/117.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 118: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/118.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 119: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/119.jpg)
Logical functions in standard forms
Consider a function Y of three variables A, B, C :
Y = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)
≡ Y1 · Y2 · Y3 · Y4
This form is called the “product of sums” form (“sum” corresponding to OR,and “product” corresponding to AND).
We can construct the truth table for Y in a systematic manner:
(1) Enumerate all possible combinations of A, B, C .Since each of A, B, C can take two values (0 or 1), we have 23 possibilities.
(2) Tabulate Y1 = A + B + C , etc. Note that Y1 is 0 only if A=B =C = 0;Y1 is 1 otherwise.
(3) Since Y = Y1 Y2 Y3 Y4,Y is 0 if any of Y1, Y2, Y3, Y4 is 0; else Y is 1.→ tabulate Y .
M. B. Patil, IIT Bombay
![Page 120: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/120.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 121: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/121.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 122: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/122.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 123: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/123.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 124: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/124.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 125: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/125.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 126: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/126.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 127: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/127.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 128: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/128.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 129: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/129.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 130: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/130.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 131: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/131.jpg)
“Product of sums” form
YCBA Y4Y3Y2Y1
Y = Y1 Y2 Y3 Y4 = (A+ B+ C) (A+ B+ C) (A+ B+ C) (A+ B+ C)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
Note that Y is identical to X (seen two slides back). This is an example of how the same function can be written in two
seemingly different forms (in this case, the sum-of-products form and the product-of-sums form).
M. B. Patil, IIT Bombay
![Page 132: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/132.jpg)
Standard sum-of-products form
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C
This form is called the standard sum-of-products form, and each individual term (consisting of all threevariables) is called a “minterm.”
In the truth table for X , the numbers of 1s is the same as the number of minterms, as we have seen in anexample.
X can be rewritten as,
X = AB C + AB (C + C)
= AB C + AB.
This is also a sum-of-products form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 133: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/133.jpg)
Standard sum-of-products form
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C
This form is called the standard sum-of-products form, and each individual term (consisting of all threevariables) is called a “minterm.”
In the truth table for X , the numbers of 1s is the same as the number of minterms, as we have seen in anexample.
X can be rewritten as,
X = AB C + AB (C + C)
= AB C + AB.
This is also a sum-of-products form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 134: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/134.jpg)
Standard sum-of-products form
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C
This form is called the standard sum-of-products form, and each individual term (consisting of all threevariables) is called a “minterm.”
In the truth table for X , the numbers of 1s is the same as the number of minterms, as we have seen in anexample.
X can be rewritten as,
X = AB C + AB (C + C)
= AB C + AB.
This is also a sum-of-products form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 135: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/135.jpg)
Standard sum-of-products form
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C
This form is called the standard sum-of-products form, and each individual term (consisting of all threevariables) is called a “minterm.”
In the truth table for X , the numbers of 1s is the same as the number of minterms, as we have seen in anexample.
X can be rewritten as,
X = AB C + AB (C + C)
= AB C + AB.
This is also a sum-of-products form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 136: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/136.jpg)
Standard sum-of-products form
Consider a function X of three variables A, B, C :
X = AB C + AB C + AB C
This form is called the standard sum-of-products form, and each individual term (consisting of all threevariables) is called a “minterm.”
In the truth table for X , the numbers of 1s is the same as the number of minterms, as we have seen in anexample.
X can be rewritten as,
X = AB C + AB (C + C)
= AB C + AB.
This is also a sum-of-products form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 137: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/137.jpg)
Standard product-of-sums form
Consider a function X of three variables A, B, C :
X = (A + B + C) (A + B + C) (A + B + C)
This form is called the standard product-of-sums form, and each individual term (consisting of all threevariables) is called a “maxterm.”
In the truth table for X , the numbers of 0s is the same as the number of maxterms, as we have seen in anexample.
X can be rewritten as,
X = (A + B + C) (A + B + C) (A + B + C)
= (A + B + C) (A + C + B) (A + C + B)
= (A + B + C) (A + C + B B)
= (A + B + C) (A + C).
This is also a product-of-sums form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 138: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/138.jpg)
Standard product-of-sums form
Consider a function X of three variables A, B, C :
X = (A + B + C) (A + B + C) (A + B + C)
This form is called the standard product-of-sums form, and each individual term (consisting of all threevariables) is called a “maxterm.”
In the truth table for X , the numbers of 0s is the same as the number of maxterms, as we have seen in anexample.
X can be rewritten as,
X = (A + B + C) (A + B + C) (A + B + C)
= (A + B + C) (A + C + B) (A + C + B)
= (A + B + C) (A + C + B B)
= (A + B + C) (A + C).
This is also a product-of-sums form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 139: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/139.jpg)
Standard product-of-sums form
Consider a function X of three variables A, B, C :
X = (A + B + C) (A + B + C) (A + B + C)
This form is called the standard product-of-sums form, and each individual term (consisting of all threevariables) is called a “maxterm.”
In the truth table for X , the numbers of 0s is the same as the number of maxterms, as we have seen in anexample.
X can be rewritten as,
X = (A + B + C) (A + B + C) (A + B + C)
= (A + B + C) (A + C + B) (A + C + B)
= (A + B + C) (A + C + B B)
= (A + B + C) (A + C).
This is also a product-of-sums form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 140: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/140.jpg)
Standard product-of-sums form
Consider a function X of three variables A, B, C :
X = (A + B + C) (A + B + C) (A + B + C)
This form is called the standard product-of-sums form, and each individual term (consisting of all threevariables) is called a “maxterm.”
In the truth table for X , the numbers of 0s is the same as the number of maxterms, as we have seen in anexample.
X can be rewritten as,
X = (A + B + C) (A + B + C) (A + B + C)
= (A + B + C) (A + C + B) (A + C + B)
= (A + B + C) (A + C + B B)
= (A + B + C) (A + C).
This is also a product-of-sums form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 141: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/141.jpg)
Standard product-of-sums form
Consider a function X of three variables A, B, C :
X = (A + B + C) (A + B + C) (A + B + C)
This form is called the standard product-of-sums form, and each individual term (consisting of all threevariables) is called a “maxterm.”
In the truth table for X , the numbers of 0s is the same as the number of maxterms, as we have seen in anexample.
X can be rewritten as,
X = (A + B + C) (A + B + C) (A + B + C)
= (A + B + C) (A + C + B) (A + C + B)
= (A + B + C) (A + C + B B)
= (A + B + C) (A + C).
This is also a product-of-sums form, but not the standard one.
M. B. Patil, IIT Bombay
![Page 142: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/142.jpg)
The “don’t care” condition
I want to design a box (with inputs A, B, C , and output S) which will help in scheduling my appointments.
A ≡ I am in town, and the time slot being suggested for the appointment is free.
B ≡ My favourite player is scheduled to play a match (which I can watch on TV).
C ≡ The appointment is crucial for my business.
S ≡ Schedule the appointment.
The following truth table summarizes the expected functioning of the box.
A B C S
0 X X 0
1 0 X 1
1 1 0 0
1 1 1 1
Note that we have a new entity called X in the truth table.
X can be 0 or 1 (it does not matter) and is therefore called the “don’t care” condition.
Don’t care conditions can often be used to get a more efficient implementation of a logical function.
M. B. Patil, IIT Bombay
![Page 143: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/143.jpg)
The “don’t care” condition
I want to design a box (with inputs A, B, C , and output S) which will help in scheduling my appointments.
A ≡ I am in town, and the time slot being suggested for the appointment is free.
B ≡ My favourite player is scheduled to play a match (which I can watch on TV).
C ≡ The appointment is crucial for my business.
S ≡ Schedule the appointment.
The following truth table summarizes the expected functioning of the box.
A B C S
0 X X 0
1 0 X 1
1 1 0 0
1 1 1 1
Note that we have a new entity called X in the truth table.
X can be 0 or 1 (it does not matter) and is therefore called the “don’t care” condition.
Don’t care conditions can often be used to get a more efficient implementation of a logical function.
M. B. Patil, IIT Bombay
![Page 144: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/144.jpg)
The “don’t care” condition
I want to design a box (with inputs A, B, C , and output S) which will help in scheduling my appointments.
A ≡ I am in town, and the time slot being suggested for the appointment is free.
B ≡ My favourite player is scheduled to play a match (which I can watch on TV).
C ≡ The appointment is crucial for my business.
S ≡ Schedule the appointment.
The following truth table summarizes the expected functioning of the box.
A B C S
0 X X 0
1 0 X 1
1 1 0 0
1 1 1 1
Note that we have a new entity called X in the truth table.
X can be 0 or 1 (it does not matter) and is therefore called the “don’t care” condition.
Don’t care conditions can often be used to get a more efficient implementation of a logical function.
M. B. Patil, IIT Bombay
![Page 145: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/145.jpg)
The “don’t care” condition
I want to design a box (with inputs A, B, C , and output S) which will help in scheduling my appointments.
A ≡ I am in town, and the time slot being suggested for the appointment is free.
B ≡ My favourite player is scheduled to play a match (which I can watch on TV).
C ≡ The appointment is crucial for my business.
S ≡ Schedule the appointment.
The following truth table summarizes the expected functioning of the box.
A B C S
0 X X 0
1 0 X 1
1 1 0 0
1 1 1 1
Note that we have a new entity called X in the truth table.
X can be 0 or 1 (it does not matter) and is therefore called the “don’t care” condition.
Don’t care conditions can often be used to get a more efficient implementation of a logical function.
M. B. Patil, IIT Bombay
![Page 146: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/146.jpg)
The “don’t care” condition
I want to design a box (with inputs A, B, C , and output S) which will help in scheduling my appointments.
A ≡ I am in town, and the time slot being suggested for the appointment is free.
B ≡ My favourite player is scheduled to play a match (which I can watch on TV).
C ≡ The appointment is crucial for my business.
S ≡ Schedule the appointment.
The following truth table summarizes the expected functioning of the box.
A B C S
0 X X 0
1 0 X 1
1 1 0 0
1 1 1 1
Note that we have a new entity called X in the truth table.
X can be 0 or 1 (it does not matter) and is therefore called the “don’t care” condition.
Don’t care conditions can often be used to get a more efficient implementation of a logical function.
M. B. Patil, IIT Bombay
![Page 147: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/147.jpg)
Karnaugh maps
* A Karnaugh map (“K-map”) is a representation of the truth table of a logicalfunction.
* A K-map can be used to obtain a “minimal” expression of a function in thesum-of-products form or in the product-of-sums form.
* A “minimal” expression has a minimum number of terms, each with a minimumnumber of variables. (For some functions, it is possible to have more than oneminimal expressions, i.e., more than one expressions with the same complexity.)
* A minimal expression can be implemented with fewer gates.
M. B. Patil, IIT Bombay
![Page 148: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/148.jpg)
Karnaugh maps
* A Karnaugh map (“K-map”) is a representation of the truth table of a logicalfunction.
* A K-map can be used to obtain a “minimal” expression of a function in thesum-of-products form or in the product-of-sums form.
* A “minimal” expression has a minimum number of terms, each with a minimumnumber of variables. (For some functions, it is possible to have more than oneminimal expressions, i.e., more than one expressions with the same complexity.)
* A minimal expression can be implemented with fewer gates.
M. B. Patil, IIT Bombay
![Page 149: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/149.jpg)
Karnaugh maps
* A Karnaugh map (“K-map”) is a representation of the truth table of a logicalfunction.
* A K-map can be used to obtain a “minimal” expression of a function in thesum-of-products form or in the product-of-sums form.
* A “minimal” expression has a minimum number of terms, each with a minimumnumber of variables. (For some functions, it is possible to have more than oneminimal expressions, i.e., more than one expressions with the same complexity.)
* A minimal expression can be implemented with fewer gates.
M. B. Patil, IIT Bombay
![Page 150: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/150.jpg)
Karnaugh maps
* A Karnaugh map (“K-map”) is a representation of the truth table of a logicalfunction.
* A K-map can be used to obtain a “minimal” expression of a function in thesum-of-products form or in the product-of-sums form.
* A “minimal” expression has a minimum number of terms, each with a minimumnumber of variables. (For some functions, it is possible to have more than oneminimal expressions, i.e., more than one expressions with the same complexity.)
* A minimal expression can be implemented with fewer gates.
M. B. Patil, IIT Bombay
![Page 151: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/151.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 152: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/152.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 153: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/153.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 154: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/154.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1
X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 155: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/155.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 156: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/156.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 157: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/157.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 158: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/158.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 159: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/159.jpg)
K-maps
YCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
X
0
0
0
0
AB
C 00 01 11 10
1
0
1
1 X
1
AB
C 00 01 11 10
1 1
1
1
X0 0
00
0
* A K-map is the same as the truth table of a function except for the way the entries are arranged.
* In a K-map, the adjacent rows or columns differ only in one variable. For example, in going from thecolumn AB = 01 to AB = 11, there is only one change, viz., A= 0 → A= 1.
M. B. Patil, IIT Bombay
![Page 160: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/160.jpg)
K-maps: example with four variables
YDCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
1
0
0
0
X
0
1
0
0
0
1
AB
00
1
1
1
0
00 01 11 10
0
1
0
0 0 0
11
0 X
00
0
CD
01
11
10
M. B. Patil, IIT Bombay
![Page 161: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/161.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
0
CD
01
11
10
X1 = ABCD
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0
CD
01
11
10
X2 = ACD
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
X3 = AC
*No. of variables No. of 1’s
4 20
3 21
2 22
* The 1’s can be enclosed by a rectangle in each case.
M. B. Patil, IIT Bombay
![Page 162: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/162.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
0
CD
01
11
10
X1 = ABCD
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0
CD
01
11
10
X2 = ACD
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
X3 = AC
*No. of variables No. of 1’s
4 20
3 21
2 22
* The 1’s can be enclosed by a rectangle in each case.
M. B. Patil, IIT Bombay
![Page 163: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/163.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
0
CD
01
11
10
X1 = ABCD
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0
CD
01
11
10
X2 = ACD
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
X3 = AC
*No. of variables No. of 1’s
4 20
3 21
2 22
* The 1’s can be enclosed by a rectangle in each case.
M. B. Patil, IIT Bombay
![Page 164: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/164.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
0
CD
01
11
10
X1 = ABCD
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0
CD
01
11
10
X2 = ACD
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
X3 = AC
*No. of variables No. of 1’s
4 20
3 21
2 22
* The 1’s can be enclosed by a rectangle in each case.
M. B. Patil, IIT Bombay
![Page 165: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/165.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
0
CD
01
11
10
X1 = ABCD
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0
CD
01
11
10
X2 = ACD
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
X3 = AC
*No. of variables No. of 1’s
4 20
3 21
2 22
* The 1’s can be enclosed by a rectangle in each case.
M. B. Patil, IIT Bombay
![Page 166: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/166.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0 0
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
CD
01
11
10
CD
01
11
10
X3 = ACX2 = ACDX1 = ABCD
AB00 01 11 10
00 0 1 0
0011
0
0
0 1
1
1
1
0
0
CD
01
11
10
Y = X1 + X2 + X3
* We are interested in identifying a minimal expression from the given K-map.
* Minimal: smallest number of terms, smallest number of variables in each term→ smallest number of rectangles containing 2k 1’s, each as large as possible
M. B. Patil, IIT Bombay
![Page 167: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/167.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0 0
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
CD
01
11
10
CD
01
11
10
X3 = ACX2 = ACDX1 = ABCD
AB00 01 11 10
00 0 1 0
0011
0
0
0 1
1
1
1
0
0
CD
01
11
10
Y = X1 + X2 + X3
* We are interested in identifying a minimal expression from the given K-map.
* Minimal: smallest number of terms, smallest number of variables in each term→ smallest number of rectangles containing 2k 1’s, each as large as possible
M. B. Patil, IIT Bombay
![Page 168: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/168.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0 0
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
CD
01
11
10
CD
01
11
10
X3 = ACX2 = ACDX1 = ABCD
AB00 01 11 10
00 0 1 0
0011
0
0
0 1
1
1
1
0
0
CD
01
11
10
Y = X1 + X2 + X3
* We are interested in identifying a minimal expression from the given K-map.
* Minimal: smallest number of terms, smallest number of variables in each term→ smallest number of rectangles containing 2k 1’s, each as large as possible
M. B. Patil, IIT Bombay
![Page 169: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/169.jpg)
K-maps
AB00 01 11 10
00 0 1 0
0000
0
0
0 0
0
0
0
0
AB00 01 11 10
00 0 0 0
0011
0
0
0 0
0
0
0
0
0 0
AB00 01 11 10
00 0 0 0
0000
0
0
0 1
1
1
1
0
0
CD
01
11
10
CD
01
11
10
CD
01
11
10
X3 = ACX2 = ACDX1 = ABCD
AB00 01 11 10
00 0 1 0
0011
0
0
0 1
1
1
1
0
0
CD
01
11
10
Y = X1 + X2 + X3
* We are interested in identifying a minimal expression from the given K-map.
* Minimal: smallest number of terms, smallest number of variables in each term→ smallest number of rectangles containing 2k 1’s, each as large as possible
M. B. Patil, IIT Bombay
![Page 170: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/170.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 171: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/171.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 172: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/172.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 173: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/173.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 174: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/174.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 175: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/175.jpg)
K-maps
AB
C
0 0 1 1 0
00001
00 01 11 10
What is the logical function (Y ) represented by this K-map?
* There are 21 1’s forming a rectangle → we can combine them.
* The product term is 1 if B = 1, and C = 0.
* The product term does not depend on A.
→ Y =B C
M. B. Patil, IIT Bombay
![Page 176: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/176.jpg)
K-maps
AB00 01 11 10C
0
1 0
0 0 1 0
100
Can the 1s shown in the K-map be combined?
Although the number of 1’s is a power of 2 (21), they cannot be combined because they are not adjacent(i.e., they do not form a rectangle).
→ the function (AB C + AB C) cannot be minimized.
M. B. Patil, IIT Bombay
![Page 177: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/177.jpg)
K-maps
AB00 01 11 10C
0
1 0
0 0 1 0
100
Can the 1s shown in the K-map be combined?
Although the number of 1’s is a power of 2 (21), they cannot be combined because they are not adjacent(i.e., they do not form a rectangle).
→ the function (AB C + AB C) cannot be minimized.
M. B. Patil, IIT Bombay
![Page 178: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/178.jpg)
K-maps
AB00 01 11 10C
0
1 0
0 0 1 0
100
Can the 1s shown in the K-map be combined?
Although the number of 1’s is a power of 2 (21), they cannot be combined because they are not adjacent(i.e., they do not form a rectangle).
→ the function (AB C + AB C) cannot be minimized.
M. B. Patil, IIT Bombay
![Page 179: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/179.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 180: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/180.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 181: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/181.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 182: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/182.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 183: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/183.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 184: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/184.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 185: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/185.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 186: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/186.jpg)
K-maps
AB
C
1 0 0 0 0
00
00 01 11 10
110
AB
C
0 1 1 0 0
00001
10 00 01 11
Can the 1’s shown in the K-map be combined?
Let us redraw the K-map by changing the order of the columns cyclically.
The two 1’s are, in fact, adjacent and can be combined to give B C .
→ Columns AB = 00 and AB = 10 in the K-map on the left are indeed “logically adjacent” (although they arenot geometrically adjacent) since they differ only in one variable (A).
We could have therefore combined the 1’s without actually redrawing the K-map.
M. B. Patil, IIT Bombay
![Page 187: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/187.jpg)
K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00 01 11 10
00
1
0
0
1 0
0
0
0
0
0
0
0
1
0
0
1
AB
CD
01
11
10
X1 = BD
1 1
1 1
0
0
0
0
0
0
0
000
0 0
00
AB00 01 11 10
01
11
10
CD
X2 = BC
M. B. Patil, IIT Bombay
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K-maps
00
0
0
0
0
00 01 11 10
0
0
0 0 0
00
0
0
AB
CD
01
11
10
Standard sum-of-products form:
Since the number of minterms is not a power of 2, they cannot be combined
into a single term; however, they can be combined into two terms:
X1 = ABCD+ ABCD + ABCD
1
1 1
= ABC (D+ D) + BCD (A+ A)
X1 = ABCD + ABCD+ ABCD+ ABCD (using Y=Y+Y)
= ABC+ BCD
* A minterm can be combined with others more than once.
M. B. Patil, IIT Bombay
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K-maps
00
0
0
0
0
00 01 11 10
0
0
0 0 0
00
0
0
AB
CD
01
11
10
Standard sum-of-products form:
Since the number of minterms is not a power of 2, they cannot be combined
into a single term; however, they can be combined into two terms:
X1 = ABCD+ ABCD + ABCD
1
1 1
= ABC (D+ D) + BCD (A+ A)
X1 = ABCD + ABCD+ ABCD+ ABCD (using Y=Y+Y)
= ABC+ BCD
* A minterm can be combined with others more than once.
M. B. Patil, IIT Bombay
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K-maps
00
0
0
0
0
00 01 11 10
0
0
0 0 0
00
0
0
AB
CD
01
11
10
Standard sum-of-products form:
Since the number of minterms is not a power of 2, they cannot be combined
into a single term; however, they can be combined into two terms:
X1 = ABCD+ ABCD + ABCD
1
1 1
= ABC (D+ D) + BCD (A+ A)
X1 = ABCD + ABCD+ ABCD+ ABCD (using Y=Y+Y)
= ABC+ BCD
* A minterm can be combined with others more than once.
M. B. Patil, IIT Bombay
![Page 196: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/196.jpg)
K-maps
00
0
0
0
0
00 01 11 10
0
0
0 0 0
00
0
0
AB
CD
01
11
10
Standard sum-of-products form:
Since the number of minterms is not a power of 2, they cannot be combined
into a single term; however, they can be combined into two terms:
X1 = ABCD+ ABCD + ABCD
1
1 1
= ABC (D+ D) + BCD (A+ A)
X1 = ABCD + ABCD+ ABCD+ ABCD (using Y=Y+Y)
= ABC+ BCD
* A minterm can be combined with others more than once.
M. B. Patil, IIT Bombay
![Page 197: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/197.jpg)
K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1:
X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1:
X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1:
X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1:
X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1:
X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1
11
1
1
1
1
00 0
0
0 0 0
0 0 0
01
11
10
00 01 11 10AB
CD
X1: X1 = AC+ BC+ ABCD + ABD
M. B. Patil, IIT Bombay
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K-maps
1 1 1
1 1
00 01 11 10
00 X
X
0 0 0
00
0 000
01
11
10
AB
CD
Z:
1 1 1
1
1
1
AB00 01 11 10
00 0 0 0
00
0 000
0
01
11
10
CD
Z = CD + ACD
Since X represents a “don’t care” condition, we can assign 0 or 1 to the corresponding minterm to arrive at aminimal expression.
M. B. Patil, IIT Bombay
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K-maps
1 1 1
1 1
00 01 11 10
00 X
X
0 0 0
00
0 000
01
11
10
AB
CD
Z:
1 1 1
1
1
1
AB00 01 11 10
00 0 0 0
00
0 000
0
01
11
10
CD
Z = CD + ACD
Since X represents a “don’t care” condition, we can assign 0 or 1 to the corresponding minterm to arrive at aminimal expression.
M. B. Patil, IIT Bombay
![Page 205: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/205.jpg)
K-maps
1 1 1
1 1
00 01 11 10
00 X
X
0 0 0
00
0 000
01
11
10
AB
CD
Z:
1 1 1
1
1
1
AB00 01 11 10
00 0 0 0
00
0 000
0
01
11
10
CD
Z = CD + ACD
Since X represents a “don’t care” condition, we can assign 0 or 1 to the corresponding minterm to arrive at aminimal expression.
M. B. Patil, IIT Bombay
![Page 206: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/206.jpg)
K-maps
1 1 1
1 1
00 01 11 10
00 X
X
0 0 0
00
0 000
01
11
10
AB
CD
Z:
1 1 1
1
1
1
AB00 01 11 10
00 0 0 0
00
0 000
0
01
11
10
CD
Z = CD + ACD
Since X represents a “don’t care” condition, we can assign 0 or 1 to the corresponding minterm to arrive at aminimal expression.
M. B. Patil, IIT Bombay
![Page 207: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/207.jpg)
K-maps
1 1 1
1 1
00 01 11 10
00 X
X
0 0 0
00
0 000
01
11
10
AB
CD
Z:
1 1 1
1
1
1
AB00 01 11 10
00 0 0 0
00
0 000
0
01
11
10
CD
Z = CD + ACD
Since X represents a “don’t care” condition, we can assign 0 or 1 to the corresponding minterm to arrive at aminimal expression.
M. B. Patil, IIT Bombay
![Page 208: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/208.jpg)
Binary numbers
3 1 7 = 3× 102 + 1× 101 + 7× 100
101102 100
Decimal (base 10) system
* Digits: 0,1,2,..,9
* example: 4 1 5 3
most significantdigit
least significantdigit
Binary (base 2) system
1 0 1 1 1 = 1× 24 + 0× 23 + 1 × 22 + 1× 21 + 1× 20
21 20
222324
= 23 (in decimal)
* Bits: 0,1
* example: 1 0 0 1 1 0
most significant
bit (MSB)
least significant
bit (LSB)
M. B. Patil, IIT Bombay
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Binary numbers
3 1 7 = 3× 102 + 1× 101 + 7× 100
101102 100
Decimal (base 10) system
* Digits: 0,1,2,..,9
* example: 4 1 5 3
most significantdigit
least significantdigit
Binary (base 2) system
1 0 1 1 1 = 1× 24 + 0× 23 + 1 × 22 + 1× 21 + 1× 20
21 20
222324
= 23 (in decimal)
* Bits: 0,1
* example: 1 0 0 1 1 0
most significant
bit (MSB)
least significant
bit (LSB)
M. B. Patil, IIT Bombay
![Page 210: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/210.jpg)
Binary numbers
3 1 7 = 3× 102 + 1× 101 + 7× 100
101102 100
Decimal (base 10) system
* Digits: 0,1,2,..,9
* example: 4 1 5 3
most significantdigit
least significantdigit
Binary (base 2) system
1 0 1 1 1 = 1× 24 + 0× 23 + 1 × 22 + 1× 21 + 1× 20
21 20
222324
= 23 (in decimal)
* Bits: 0,1
* example: 1 0 0 1 1 0
most significant
bit (MSB)
least significant
bit (LSB)
M. B. Patil, IIT Bombay
![Page 211: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/211.jpg)
Binary numbers
3 1 7 = 3× 102 + 1× 101 + 7× 100
101102 100
Decimal (base 10) system
* Digits: 0,1,2,..,9
* example: 4 1 5 3
most significantdigit
least significantdigit
Binary (base 2) system
1 0 1 1 1 = 1× 24 + 0× 23 + 1 × 22 + 1× 21 + 1× 20
21 20
222324
= 23 (in decimal)
* Bits: 0,1
* example: 1 0 0 1 1 0
most significant
bit (MSB)
least significant
bit (LSB)
M. B. Patil, IIT Bombay
![Page 212: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/212.jpg)
Addition of binary numbers
49111
9
5
7
1
1
1
0
3
8
weight
first number
second number
carry
sum
1
104 103 102 101 100
Decimal (base 10) system
1
1
weight
carry
1 0 1 1
1 1 0
1
11 0 0 1
first number (dec. 11)
sum (dec. 25)
second number (dec. 14)
1
2021222324
Binary (base 2) system
* 0+ 1 = 1+ 0 = 1 → S = 1, C = 0
* 1+ 1 = 10 (dec. 2) → S = 0, C = 1
* 1+ 1+ 1 = 11 (dec. 3) → S = 1,C = 1
M. B. Patil, IIT Bombay
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Addition of binary numbers
49111
9
5
7
1
1
1
0
3
8
weight
first number
second number
carry
sum
1
104 103 102 101 100
Decimal (base 10) system
1
1
weight
carry
1 0 1 1
1 1 0
1
11 0 0 1
first number (dec. 11)
sum (dec. 25)
second number (dec. 14)
1
2021222324
Binary (base 2) system
* 0+ 1 = 1+ 0 = 1 → S = 1, C = 0
* 1+ 1 = 10 (dec. 2) → S = 0, C = 1
* 1+ 1+ 1 = 11 (dec. 3) → S = 1,C = 1
M. B. Patil, IIT Bombay
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Addition of binary numbers
49111
9
5
7
1
1
1
0
3
8
weight
first number
second number
carry
sum
1
104 103 102 101 100
Decimal (base 10) system
1
1
weight
carry
1 0 1 1
1 1 0
1
11 0 0 1
first number (dec. 11)
sum (dec. 25)
second number (dec. 14)
1
2021222324
Binary (base 2) system
* 0+ 1 = 1+ 0 = 1 → S = 1, C = 0
* 1+ 1 = 10 (dec. 2) → S = 0, C = 1
* 1+ 1+ 1 = 11 (dec. 3) → S = 1,C = 1
M. B. Patil, IIT Bombay
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Addition of binary numbers
49111
9
5
7
1
1
1
0
3
8
weight
first number
second number
carry
sum
1
104 103 102 101 100
Decimal (base 10) system
1
1
weight
carry
1 0 1 1
1 1 0
1
11 0 0 1
first number (dec. 11)
sum (dec. 25)
second number (dec. 14)
1
2021222324
Binary (base 2) system
* 0+ 1 = 1+ 0 = 1 → S = 1, C = 0
* 1+ 1 = 10 (dec. 2) → S = 0, C = 1
* 1+ 1+ 1 = 11 (dec. 3) → S = 1,C = 1
M. B. Patil, IIT Bombay
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Addition of binary numbers
49111
9
5
7
1
1
1
0
3
8
weight
first number
second number
carry
sum
1
104 103 102 101 100
Decimal (base 10) system
1
1
weight
carry
1 0 1 1
1 1 0
1
11 0 0 1
first number (dec. 11)
sum (dec. 25)
second number (dec. 14)
1
2021222324
Binary (base 2) system
* 0+ 1 = 1+ 0 = 1 → S = 1, C = 0
* 1+ 1 = 10 (dec. 2) → S = 0, C = 1
* 1+ 1+ 1 = 11 (dec. 3) → S = 1,C = 1
M. B. Patil, IIT Bombay
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Addition of binary numbers
0
0 −
example
1
1
weight
carry
1 0 1 1
1 1
1
11 0 0 1
1
first number
second number
sum
2021222324
weight
first number
second number
carry
sum
general procedure
CN
20
AN
BN
CN−1
2122
A2
B2
C1
S2 S1
C0
B1
A1
2N
A0
B0
S0SN
· · ·
· · ·
· · ·
A
B
S
A
B
S
A
B
S
FA
A
B
S
FA FA HA
CinCin Cin CoCoCo CoCNCN−1
BNAN
S2
C1
B2A2
S1
C0
A1 B1
S0
B0A0
SN
* The rightmost block (corresponding to the LSB) adds two bits A0 and B0; there is no input carry.This block is called a “half adder.”
* Each of the subsequent blocks adds three bits (Ai , Bi , Ci−1) and is called a “full adder.”
M. B. Patil, IIT Bombay
![Page 218: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/218.jpg)
Addition of binary numbers
0
0 −
example
1
1
weight
carry
1 0 1 1
1 1
1
11 0 0 1
1
first number
second number
sum
2021222324 weight
first number
second number
carry
sum
general procedure
CN
20
AN
BN
CN−1
2122
A2
B2
C1
S2 S1
C0
B1
A1
2N
A0
B0
S0SN
· · ·
· · ·
· · ·
A
B
S
A
B
S
A
B
S
FA
A
B
S
FA FA HA
CinCin Cin CoCoCo CoCNCN−1
BNAN
S2
C1
B2A2
S1
C0
A1 B1
S0
B0A0
SN
* The rightmost block (corresponding to the LSB) adds two bits A0 and B0; there is no input carry.This block is called a “half adder.”
* Each of the subsequent blocks adds three bits (Ai , Bi , Ci−1) and is called a “full adder.”
M. B. Patil, IIT Bombay
![Page 219: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/219.jpg)
Addition of binary numbers
0
0 −
example
1
1
weight
carry
1 0 1 1
1 1
1
11 0 0 1
1
first number
second number
sum
2021222324 weight
first number
second number
carry
sum
general procedure
CN
20
AN
BN
CN−1
2122
A2
B2
C1
S2 S1
C0
B1
A1
2N
A0
B0
S0SN
· · ·
· · ·
· · ·
A
B
S
A
B
S
A
B
S
FA
A
B
S
FA FA HA
CinCin Cin CoCoCo CoCNCN−1
BNAN
S2
C1
B2A2
S1
C0
A1 B1
S0
B0A0
SN
* The rightmost block (corresponding to the LSB) adds two bits A0 and B0; there is no input carry.This block is called a “half adder.”
* Each of the subsequent blocks adds three bits (Ai , Bi , Ci−1) and is called a “full adder.”
M. B. Patil, IIT Bombay
![Page 220: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/220.jpg)
Addition of binary numbers
0
0 −
example
1
1
weight
carry
1 0 1 1
1 1
1
11 0 0 1
1
first number
second number
sum
2021222324 weight
first number
second number
carry
sum
general procedure
CN
20
AN
BN
CN−1
2122
A2
B2
C1
S2 S1
C0
B1
A1
2N
A0
B0
S0SN
· · ·
· · ·
· · ·
A
B
S
A
B
S
A
B
S
FA
A
B
S
FA FA HA
CinCin Cin CoCoCo CoCNCN−1
BNAN
S2
C1
B2A2
S1
C0
A1 B1
S0
B0A0
SN
* The rightmost block (corresponding to the LSB) adds two bits A0 and B0; there is no input carry.This block is called a “half adder.”
* Each of the subsequent blocks adds three bits (Ai , Bi , Ci−1) and is called a “full adder.”
M. B. Patil, IIT Bombay
![Page 221: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/221.jpg)
Addition of binary numbers
0
0 −
example
1
1
weight
carry
1 0 1 1
1 1
1
11 0 0 1
1
first number
second number
sum
2021222324 weight
first number
second number
carry
sum
general procedure
CN
20
AN
BN
CN−1
2122
A2
B2
C1
S2 S1
C0
B1
A1
2N
A0
B0
S0SN
· · ·
· · ·
· · ·
A
B
S
A
B
S
A
B
S
FA
A
B
S
FA FA HA
CinCin Cin CoCoCo CoCNCN−1
BNAN
S2
C1
B2A2
S1
C0
A1 B1
S0
B0A0
SN
* The rightmost block (corresponding to the LSB) adds two bits A0 and B0; there is no input carry.This block is called a “half adder.”
* Each of the subsequent blocks adds three bits (Ai , Bi , Ci−1) and is called a “full adder.”
M. B. Patil, IIT Bombay
![Page 222: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/222.jpg)
Half adder implementation
A
B
S
HA
Co
SCoA
C0
B
S0
B0
A0
1
0
1 0
1
0 0
1
0
0
0
1 0
1
1
0
S = AB+ AB = A⊕ B
Co = AB
Implementation 1
Co
A
B
A
B
AB
AB
S
Implementation 2
Co
A+ B
AB
S
A
B
M. B. Patil, IIT Bombay
![Page 223: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/223.jpg)
Half adder implementation
A
B
S
HA
Co
SCoA
C0
B
S0
B0
A0
1
0
1 0
1
0 0
1
0
0
0
1 0
1
1
0S = AB+ AB = A⊕ B
Co = AB
Implementation 1
Co
A
B
A
B
AB
AB
S
Implementation 2
Co
A+ B
AB
S
A
B
M. B. Patil, IIT Bombay
![Page 224: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/224.jpg)
Half adder implementation
A
B
S
HA
Co
SCoA
C0
B
S0
B0
A0
1
0
1 0
1
0 0
1
0
0
0
1 0
1
1
0S = AB+ AB = A⊕ B
Co = AB
Implementation 1
Co
A
B
A
B
AB
AB
S
Implementation 2
Co
A+ B
AB
S
A
B
M. B. Patil, IIT Bombay
![Page 225: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/225.jpg)
Half adder implementation
A
B
S
HA
Co
SCoA
C0
B
S0
B0
A0
1
0
1 0
1
0 0
1
0
0
0
1 0
1
1
0S = AB+ AB = A⊕ B
Co = AB
Implementation 1
Co
A
B
A
B
AB
AB
S
Implementation 2
Co
A+ B
AB
S
A
B
M. B. Patil, IIT Bombay
![Page 226: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/226.jpg)
Full adder implementation
A
B
S
FA
Co SCin
Co Cin
BA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
S:
00 01 11 10
0 0 1 0 1
1 1 0 1 0
AB
S = ABCin + ABCin + ABCin + ABCin
Cin
AB
00 01 11 10
0 0 0 1 0
1 0 1 11
Co = AB + BCin + ACin
Co:
Cin
M. B. Patil, IIT Bombay
![Page 227: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/227.jpg)
Full adder implementation
A
B
S
FA
Co SCin
Co Cin
BA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
S:
00 01 11 10
0 0 1 0 1
1 1 0 1 0
AB
S = ABCin + ABCin + ABCin + ABCin
Cin
AB
00 01 11 10
0 0 0 1 0
1 0 1 11
Co = AB + BCin + ACin
Co:
Cin
M. B. Patil, IIT Bombay
![Page 228: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/228.jpg)
Full adder implementation
A
B
S
FA
Co SCin
Co Cin
BA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
S:
00 01 11 10
0 0 1 0 1
1 1 0 1 0
AB
S = ABCin + ABCin + ABCin + ABCin
Cin
AB
00 01 11 10
0 0 0 1 0
1 0 1 11
Co = AB + BCin + ACin
Co:
Cin
M. B. Patil, IIT Bombay
![Page 229: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/229.jpg)
Implementation of functions with only NAND gates
The NOT, AND, OR operations can be realised by using only NAND gates:
NOT
A = A · A
A A
AND
A · B = A · B
ABA
B
OR
A+ B = A · B
A
B
A+ B
M. B. Patil, IIT Bombay
![Page 230: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/230.jpg)
Implementation of functions with only NAND gates
The NOT, AND, OR operations can be realised by using only NAND gates:
NOT
A = A · A
A A
AND
A · B = A · B
ABA
B
OR
A+ B = A · B
A
B
A+ B
M. B. Patil, IIT Bombay
![Page 231: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/231.jpg)
Implementation of functions with only NAND gates
The NOT, AND, OR operations can be realised by using only NAND gates:
NOT
A = A · A
A A
AND
A · B = A · B
ABA
B
OR
A+ B = A · B
A
B
A+ B
M. B. Patil, IIT Bombay
![Page 232: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/232.jpg)
Implementation of functions with only NAND gates
The NOT, AND, OR operations can be realised by using only NAND gates:
NOT
A = A · A
A A
AND
A · B = A · B
ABA
B
OR
A+ B = A · B
A
B
A+ B
M. B. Patil, IIT Bombay
![Page 233: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/233.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 234: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/234.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 235: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/235.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 236: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/236.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 237: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/237.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 238: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/238.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 239: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/239.jpg)
Implementation of functions with only NAND gates
Implement Y = AB+ BCD+ AD using only NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = AB · BCD · AD
AB
BCDY
AD
A
B
D
BC
A
D
M. B. Patil, IIT Bombay
![Page 240: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/240.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 241: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/241.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 242: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/242.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 243: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/243.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 244: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/244.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 245: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/245.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 246: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/246.jpg)
Implementation of functions with only NAND gates
A · B = A · B
A = A · A
A+ B = A · B
Implement Y = AB+ BCD+ AD using only NAND gates.
A
B
B
C
D
D
A
Y
M. B. Patil, IIT Bombay
![Page 247: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/247.jpg)
Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
![Page 248: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/248.jpg)
Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
![Page 249: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/249.jpg)
Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
C
C
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NAND gates
Implement Y = A+ B+ C using only 2-input NAND gates.
A · B = A · B
A = A · A
A+ B = A · B
Y = (A+ B) + C
= (A+ B) · C
A+ B
Y
CC
= A · B · C
A+ B
B
AA
B
M. B. Patil, IIT Bombay
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Implementation of functions with only NOR gates
The NOT, AND, OR operations can be realised by using only NOR gates:
NOT
A = A+ A
AA
AND
A · B = A+ B
A
B
AB
OR
A+ B = A+ B
A
BA+ B
Implementation of functions with only NOR (or only NAND) gates is more than a theoretical curiosity. There
are chips which provide a “sea of gates” (say, NOR gates) which can be configured by the user (through
programming) to implement functions.
M. B. Patil, IIT Bombay
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Implementation of functions with only NOR gates
The NOT, AND, OR operations can be realised by using only NOR gates:
NOT
A = A+ A
AA
AND
A · B = A+ B
A
B
AB
OR
A+ B = A+ B
A
BA+ B
Implementation of functions with only NOR (or only NAND) gates is more than a theoretical curiosity. There
are chips which provide a “sea of gates” (say, NOR gates) which can be configured by the user (through
programming) to implement functions.
M. B. Patil, IIT Bombay
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Implementation of functions with only NOR gates
The NOT, AND, OR operations can be realised by using only NOR gates:
NOT
A = A+ A
AA
AND
A · B = A+ B
A
B
AB
OR
A+ B = A+ B
A
BA+ B
Implementation of functions with only NOR (or only NAND) gates is more than a theoretical curiosity. There
are chips which provide a “sea of gates” (say, NOR gates) which can be configured by the user (through
programming) to implement functions.
M. B. Patil, IIT Bombay
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Implementation of functions with only NOR gates
The NOT, AND, OR operations can be realised by using only NOR gates:
NOT
A = A+ A
AA
AND
A · B = A+ B
A
B
AB
OR
A+ B = A+ B
A
BA+ B
Implementation of functions with only NOR (or only NAND) gates is more than a theoretical curiosity. There
are chips which provide a “sea of gates” (say, NOR gates) which can be configured by the user (through
programming) to implement functions.
M. B. Patil, IIT Bombay
![Page 259: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/259.jpg)
Implementation of functions with only NOR gates
The NOT, AND, OR operations can be realised by using only NOR gates:
NOT
A = A+ A
AA
AND
A · B = A+ B
A
B
AB
OR
A+ B = A+ B
A
BA+ B
Implementation of functions with only NOR (or only NAND) gates is more than a theoretical curiosity. There
are chips which provide a “sea of gates” (say, NOR gates) which can be configured by the user (through
programming) to implement functions.
M. B. Patil, IIT Bombay
![Page 260: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/260.jpg)
Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Implement Y = AB+ BCD+ AD using only NOR gates.
A+ B = A+ B
A = A+ A
A · B = A+ B
Y = AB+ BCD+ AD
BCDY
AB
AD
= (A+ B) + (B+ C+ D) + (A+ D)
A
B
A
B
CC
D
DD
A
M. B. Patil, IIT Bombay
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Multiplexers
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
S1 S0
SW0
SW1
SW2
SW3
I0
I1
I2
I3Z
* A multiplexer or data selector (MUX in short) has N Select lines, 2N input lines, and it routes one of theinput lines to the output.
* Conceptually, a MUX may be thought of as 2N switches. For a given combination of the select inputs,only one of the switches closes (makes contact), and the others are open.
* SEQUEL file: mux test 1.sqproj
M. B. Patil, IIT Bombay
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Multiplexers
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
S1 S0
SW0
SW1
SW2
SW3
I0
I1
I2
I3Z
* A multiplexer or data selector (MUX in short) has N Select lines, 2N input lines, and it routes one of theinput lines to the output.
* Conceptually, a MUX may be thought of as 2N switches. For a given combination of the select inputs,only one of the switches closes (makes contact), and the others are open.
* SEQUEL file: mux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 270: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/270.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
S1 S0
SW0
SW1
SW2
SW3
I0
I1
I2
I3Z
* A multiplexer or data selector (MUX in short) has N Select lines, 2N input lines, and it routes one of theinput lines to the output.
* Conceptually, a MUX may be thought of as 2N switches. For a given combination of the select inputs,only one of the switches closes (makes contact), and the others are open.
* SEQUEL file: mux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 271: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/271.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
S1 S0
SW0
SW1
SW2
SW3
I0
I1
I2
I3Z
* A multiplexer or data selector (MUX in short) has N Select lines, 2N input lines, and it routes one of theinput lines to the output.
* Conceptually, a MUX may be thought of as 2N switches. For a given combination of the select inputs,only one of the switches closes (makes contact), and the others are open.
* SEQUEL file: mux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 272: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/272.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
S1 S0
SW0
SW1
SW2
SW3
I0
I1
I2
I3Z
* A multiplexer or data selector (MUX in short) has N Select lines, 2N input lines, and it routes one of theinput lines to the output.
* Conceptually, a MUX may be thought of as 2N switches. For a given combination of the select inputs,only one of the switches closes (makes contact), and the others are open.
* SEQUEL file: mux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 273: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/273.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
S1
Z
S0
I0
I1
I2
I3
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
* A 4-to-1 MUX can be implemented as,
Z = I0 S1 S0 + I1 S1 S0 + I2 S1 S0 + I3 S1 S0.
For a given combination of S1 and S0, only one of the terms survives (the others being 0). For example, with S1 = 0,S0 = 1, we have Z = I1.
* Multiplexers are available as ICs, e.g., 74151 is an 8-to-1 MUX.
* ICs with arrays of multiplexers (and other digital blocks) are also available. These blocks can be configured (“wired”) bythe user in a programmable manner to realise the functionality of interest.
M. B. Patil, IIT Bombay
![Page 274: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/274.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
S1
Z
S0
I0
I1
I2
I3
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
* A 4-to-1 MUX can be implemented as,
Z = I0 S1 S0 + I1 S1 S0 + I2 S1 S0 + I3 S1 S0.
For a given combination of S1 and S0, only one of the terms survives (the others being 0). For example, with S1 = 0,S0 = 1, we have Z = I1.
* Multiplexers are available as ICs, e.g., 74151 is an 8-to-1 MUX.
* ICs with arrays of multiplexers (and other digital blocks) are also available. These blocks can be configured (“wired”) bythe user in a programmable manner to realise the functionality of interest.
M. B. Patil, IIT Bombay
![Page 275: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/275.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
S1
Z
S0
I0
I1
I2
I3
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
* A 4-to-1 MUX can be implemented as,
Z = I0 S1 S0 + I1 S1 S0 + I2 S1 S0 + I3 S1 S0.
For a given combination of S1 and S0, only one of the terms survives (the others being 0). For example, with S1 = 0,S0 = 1, we have Z = I1.
* Multiplexers are available as ICs, e.g., 74151 is an 8-to-1 MUX.
* ICs with arrays of multiplexers (and other digital blocks) are also available. These blocks can be configured (“wired”) bythe user in a programmable manner to realise the functionality of interest.
M. B. Patil, IIT Bombay
![Page 276: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/276.jpg)
Multiplexers
I0
I1
I2
I3
S1 S0
S1
Z
S0
I0
I1
I2
I3
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
* A 4-to-1 MUX can be implemented as,
Z = I0 S1 S0 + I1 S1 S0 + I2 S1 S0 + I3 S1 S0.
For a given combination of S1 and S0, only one of the terms survives (the others being 0). For example, with S1 = 0,S0 = 1, we have Z = I1.
* Multiplexers are available as ICs, e.g., 74151 is an 8-to-1 MUX.
* ICs with arrays of multiplexers (and other digital blocks) are also available. These blocks can be configured (“wired”) bythe user in a programmable manner to realise the functionality of interest.
M. B. Patil, IIT Bombay
![Page 277: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/277.jpg)
Active high and active low inputs/outputs
Select inputs are active high.
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
Select inputs are active low.
I0
I1
I2
I3
Z
S0S1
S0
Z
S1
11
1
0
0
1
00
I1
I2
I3
I0
M. B. Patil, IIT Bombay
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Active high and active low inputs/outputs
Select inputs are active high.
I0
I1
I2
I3
S1 S0
Z
S0S1 Z
1
0
1 0
1
0 0
1 I1
I2
I3
I0
Select inputs are active low.
I0
I1
I2
I3
Z
S0S1
S0
Z
S1
11
1
0
0
1
00
I1
I2
I3
I0
M. B. Patil, IIT Bombay
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Enable (E) pin
inputs outputs
Active high enable pin
inputs outputs
Active low enable pin
EE
* Many digital ICs have an “Enable” (E) pin. If the Enable pin is active, the IC functions as desired; else, itis “disabled,” i.e., the outputs are set to some default values.
* The Enable pin can be active high or active low.
* If the Enable pin is active low, it is denoted by Enable or E. When E = 0, the IC functions normally; else,it is disabled.
M. B. Patil, IIT Bombay
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Enable (E) pin
inputs outputs
Active high enable pin
inputs outputs
Active low enable pin
EE
* Many digital ICs have an “Enable” (E) pin. If the Enable pin is active, the IC functions as desired; else, itis “disabled,” i.e., the outputs are set to some default values.
* The Enable pin can be active high or active low.
* If the Enable pin is active low, it is denoted by Enable or E. When E = 0, the IC functions normally; else,it is disabled.
M. B. Patil, IIT Bombay
![Page 281: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/281.jpg)
Enable (E) pin
inputs outputs
Active high enable pin
inputs outputs
Active low enable pin
EE
* Many digital ICs have an “Enable” (E) pin. If the Enable pin is active, the IC functions as desired; else, itis “disabled,” i.e., the outputs are set to some default values.
* The Enable pin can be active high or active low.
* If the Enable pin is active low, it is denoted by Enable or E. When E = 0, the IC functions normally; else,it is disabled.
M. B. Patil, IIT Bombay
![Page 282: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/282.jpg)
Enable (E) pin
inputs outputs
Active high enable pin
inputs outputs
Active low enable pin
EE
* Many digital ICs have an “Enable” (E) pin. If the Enable pin is active, the IC functions as desired; else, itis “disabled,” i.e., the outputs are set to some default values.
* The Enable pin can be active high or active low.
* If the Enable pin is active low, it is denoted by Enable or E. When E = 0, the IC functions normally; else,it is disabled.
M. B. Patil, IIT Bombay
![Page 283: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/283.jpg)
Using two 8-to-1 MUXs to make a 16-to-1 MUX
D1
D2
D3
D5
D9
D11
D15
D0
D4
D6
D7
D8
D10
D12
D13
D14
I0
I1
I2
I3
I4
I5
I6
I7
S2 S1 S0
I0
I1
I2
I3
I4
I5
I6
I7
S2 S1 S0
S2 S1S3 S0
X
X2
X174151 Z
74151 Z
S0 XS1S2S3
E
E
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
D15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
0
0
1
1
1
1
0
0
0
0
1
1
1
M. B. Patil, IIT Bombay
![Page 284: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/284.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 285: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/285.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 286: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/286.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 287: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/287.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 288: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/288.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 289: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/289.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 290: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/290.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 291: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/291.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 292: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/292.jpg)
Implement X = AB C D + AB C D using a 16-to-1 MUX.
MUX
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
I0I1I2I3I4I5I6I7I8I9I10I11I12I13I14I15
S3 S2
A B C D
0
0
1
1
1
1
0
0
0
0
1
1
1
0
Z X
S1 S0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
* When AB C D = 1, we want X = 1.
AB C D = 1→ A= 1, B = 0, C = 0,D = 1, i.e., the input line corresponding to1001 (I9) gets selected.→ Make I9 = 1.
* Similarly, when AB C D = 1, we wantX = 1.→ Make I4 = 1.
* In all other cases, X should be 0.→ connect all other pins to 0.
* In this example, since the truth table isorganized in terms of ABCD, with A asthe MSB and D as the LSB (the sameorder in which A, B, C , D are connectedto the select pins), the design is simple:connectI0 to X(0 0 0 0),I1 to X(0 0 0 1),I2 to X(0 0 1 0), etc.
M. B. Patil, IIT Bombay
![Page 293: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/293.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 294: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/294.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 295: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/295.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 296: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/296.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 297: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/297.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 298: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/298.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 299: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/299.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 300: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/300.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 301: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/301.jpg)
Implement X = AB C D + AB C D using an 8-to-1 MUX.
MUX
C XBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
0
0
1
1
1
1
0
S1 S0
Z X
D
D
D
D
0
0
0
0
0
0
* When AB C = 1, i.e., A= 1, B = 0, C = 0, we have X =D.→ connect the input line corresponding to 100 (I4) to D.
* When AB C = 1, i.e., A= 0, B = 1, C = 0, we have X =D.→ connect the input line corresponding to 010 (I2) to D.
* In all other cases, X should be 0.→ connect all other pins to 0.
* Home work: Implement the same function (X ) with S2 =B, S1 =C , S0 =D.
M. B. Patil, IIT Bombay
![Page 302: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/302.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 303: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/303.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 304: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/304.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 305: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/305.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 306: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/306.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 307: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/307.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 308: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/308.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 309: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/309.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 310: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/310.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 311: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/311.jpg)
D XCBA
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
00
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0 0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
I7
I6
I5
I4
I3
I2
I1
I0
S2
A B C
MUX Z X
S1 S0
1
0
D
1
1
1
D
1
0
0
0
D
0
0
0
1
1
0
1
1
0
0
0
0
Implement the function X using an 8-to-1 MUX.
* When ABC = 000, X =D → I0 =D.
* When ABC = 001, X = 1→ I1 = 1,and so on.
* Home work: repeat with S2 =B, S1 =C ,S0 =D.
M. B. Patil, IIT Bombay
![Page 312: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/312.jpg)
Demultiplexers
DEMUX
S0 O7O0 O2 O3 O4 O5 O6O1S1S2
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
S2
O0
O1
O2
O3
O4
O5
O6
O7
0
0
1
1
1
1
I
S1 S0
* A demultiplexer takes a single input (I) and routes it to one of the output lines (O0, O1,· · · ).
* For N Select inputs (S0, S1,· · · ), the number of output lines is 2N .
* SEQUEL file: demux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 313: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/313.jpg)
Demultiplexers
DEMUX
S0 O7O0 O2 O3 O4 O5 O6O1S1S2
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
S2
O0
O1
O2
O3
O4
O5
O6
O7
0
0
1
1
1
1
I
S1 S0
* A demultiplexer takes a single input (I) and routes it to one of the output lines (O0, O1,· · · ).
* For N Select inputs (S0, S1,· · · ), the number of output lines is 2N .
* SEQUEL file: demux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 314: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/314.jpg)
Demultiplexers
DEMUX
S0 O7O0 O2 O3 O4 O5 O6O1S1S2
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
S2
O0
O1
O2
O3
O4
O5
O6
O7
0
0
1
1
1
1
I
S1 S0
* A demultiplexer takes a single input (I) and routes it to one of the output lines (O0, O1,· · · ).
* For N Select inputs (S0, S1,· · · ), the number of output lines is 2N .
* SEQUEL file: demux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 315: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/315.jpg)
Demultiplexers
DEMUX
S0 O7O0 O2 O3 O4 O5 O6O1S1S2
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0 0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
0
0
0
0
0
0
I
0
0
0
0
0
0
0
0
I
0
0
0
0
0
0
0
I
S2
O0
O1
O2
O3
O4
O5
O6
O7
0
0
1
1
1
1
I
S1 S0
* A demultiplexer takes a single input (I) and routes it to one of the output lines (O0, O1,· · · ).
* For N Select inputs (S0, S1,· · · ), the number of output lines is 2N .
* SEQUEL file: demux test 1.sqproj
M. B. Patil, IIT Bombay
![Page 316: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/316.jpg)
Demultiplexer: gate-level diagram
O0
O1
O2
O3
O4
O5
O6
O7S2
DEMUX
I
I
S1 S0
O0
O1
O2
O3
O4
O5
O6
O7
S2 S1 S0 M. B. Patil, IIT Bombay
![Page 317: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/317.jpg)
Decoders
N inputs Decoder M outputs
A0
A1
AN−1
O0
O1
OM−1
* For each input combination, an associated bit pattern appears at the output.
M. B. Patil, IIT Bombay
![Page 318: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/318.jpg)
Decoders
N inputs Decoder M outputs
A0
A1
AN−1
O0
O1
OM−1
* For each input combination, an associated bit pattern appears at the output.
M. B. Patil, IIT Bombay
![Page 319: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/319.jpg)
3-to-8 decoder (1-of-8 decoder)
O0
O1
O2
O3
O4
O5
O6
O7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Decoder
A0
A1
A2
A0 O7O6O5O4O3O2O1O0A1A2
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
M. B. Patil, IIT Bombay
![Page 320: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/320.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 321: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/321.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 322: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/322.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 323: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/323.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 324: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/324.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 325: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/325.jpg)
Binary-Coded-Decimal (BCD) encoding
* Example:
Decimal 75
Binary 1001011
BCD 0111 0101
* BCD coding is commonly used to display numbers in electronic systems.
7−segment
display
decoder
BCD
input
BCD−to−7−seg
01010111
* In some electronic systems (e.g., calculators), all computations are performed in BCD.
M. B. Patil, IIT Bombay
![Page 326: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/326.jpg)
7-segment display
common
anode
g
a
b
c
d
e
f
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001
VCC
a
b
c
d
e
f
g
M. B. Patil, IIT Bombay
![Page 327: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/327.jpg)
BCD-to-7 segment decoder
D
C
B
A
common
anode
MSB
LSB
g
7446
a
b
c
d
e
f
VCC
a
b
d
e
f
g
0000 0001 0010 0011 0100 0101 0110 0111 1000 1111111011011100101110101001
c
* The resistors serve to limit the diodecurrent. For VCC = 5V , VD = 2V , andID = 10 mA, R = 300 Ω.
* Home work: Write the truth table forc (in terms of D, C , B, A). Obtain aminimized expression for c using a Kmap.
M. B. Patil, IIT Bombay
![Page 328: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/328.jpg)
BCD-to-7 segment decoder
D
C
B
A
common
anode
MSB
LSB
g
7446
a
b
c
d
e
f
VCC
a
b
d
e
f
g
0000 0001 0010 0011 0100 0101 0110 0111 1000 1111111011011100101110101001
c
* The resistors serve to limit the diodecurrent. For VCC = 5V , VD = 2V , andID = 10 mA, R = 300 Ω.
* Home work: Write the truth table forc (in terms of D, C , B, A). Obtain aminimized expression for c using a Kmap.
M. B. Patil, IIT Bombay
![Page 329: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/329.jpg)
BCD-to-7 segment decoder
D
C
B
A
common
anode
MSB
LSB
g
7446
a
b
c
d
e
f
VCC
a
b
d
e
f
g
0000 0001 0010 0011 0100 0101 0110 0111 1000 1111111011011100101110101001
c
* The resistors serve to limit the diodecurrent. For VCC = 5V , VD = 2V , andID = 10 mA, R = 300 Ω.
* Home work: Write the truth table forc (in terms of D, C , B, A). Obtain aminimized expression for c using a Kmap.
M. B. Patil, IIT Bombay
![Page 330: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/330.jpg)
BCD-to-decimal decoder
none
Active output
7442
none
none
none
none
none
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
O1
O2
O3
O4
O5
O6
O7
O8
O9
O0
O0
O1
O2
O3
O4
O5
O6
O7
O8
O9
A0
A1
A2
A3
A0A1A2A3
* Note that the combinations A3A2A1A0 = 1010 onwards are “don’t care” conditions since a BCD (binary coded decimal)number is expected to be less than 1010 (i.e., decimal 10).
M. B. Patil, IIT Bombay
![Page 331: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/331.jpg)
BCD-to-decimal decoder
none
Active output
7442
none
none
none
none
none
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
O1
O2
O3
O4
O5
O6
O7
O8
O9
O0
O0
O1
O2
O3
O4
O5
O6
O7
O8
O9
A0
A1
A2
A3
A0A1A2A3
* Note that the combinations A3A2A1A0 = 1010 onwards are “don’t care” conditions since a BCD (binary coded decimal)number is expected to be less than 1010 (i.e., decimal 10).
M. B. Patil, IIT Bombay
![Page 332: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/332.jpg)
Encoders
M inputs Encoder N outputs
O0
O1
ON−1
A0
A1
AM−1
* Only one input line is assumed to be active. The binary number corresponding to the active input lineappears at the output pins.
* The N output lines can represent 2N binary numbers, each corresponding to one of the M input lines, i.e.,we can have M = 2N . Some encoders have M < 2N .
* As an example, for N = 3, we can have a maximum of 23 = 8 input lines.
M. B. Patil, IIT Bombay
![Page 333: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/333.jpg)
Encoders
M inputs Encoder N outputs
O0
O1
ON−1
A0
A1
AM−1
* Only one input line is assumed to be active. The binary number corresponding to the active input lineappears at the output pins.
* The N output lines can represent 2N binary numbers, each corresponding to one of the M input lines, i.e.,we can have M = 2N . Some encoders have M < 2N .
* As an example, for N = 3, we can have a maximum of 23 = 8 input lines.
M. B. Patil, IIT Bombay
![Page 334: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/334.jpg)
Encoders
M inputs Encoder N outputs
O0
O1
ON−1
A0
A1
AM−1
* Only one input line is assumed to be active. The binary number corresponding to the active input lineappears at the output pins.
* The N output lines can represent 2N binary numbers, each corresponding to one of the M input lines, i.e.,we can have M = 2N . Some encoders have M < 2N .
* As an example, for N = 3, we can have a maximum of 23 = 8 input lines.
M. B. Patil, IIT Bombay
![Page 335: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/335.jpg)
Encoders
M inputs Encoder N outputs
O0
O1
ON−1
A0
A1
AM−1
* Only one input line is assumed to be active. The binary number corresponding to the active input lineappears at the output pins.
* The N output lines can represent 2N binary numbers, each corresponding to one of the M input lines, i.e.,we can have M = 2N . Some encoders have M < 2N .
* As an example, for N = 3, we can have a maximum of 23 = 8 input lines.
M. B. Patil, IIT Bombay
![Page 336: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/336.jpg)
Encoders
O0
O1
O2
A0
A1
A2
A3
A4
A5
A6
A7
8−to−3 encoder example
Encoder
A0 A1 A2 A3 A4 A5 A6 A7 O0O1O2
1 0 0 0 0 0 0 0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0 0 0 0
00000
0
0
0
0
0
0
0
0
0 0 0 0
00
0
0 0 0 0
0
0
0
0
00
00
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
* Note that only one of the input lines is assumed to be active.
* What if two input lines become simultaneously active?→ There are “priority encoders” which assign a priority to each of the input lines.
M. B. Patil, IIT Bombay
![Page 337: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/337.jpg)
Encoders
O0
O1
O2
A0
A1
A2
A3
A4
A5
A6
A7
8−to−3 encoder example
Encoder
A0 A1 A2 A3 A4 A5 A6 A7 O0O1O2
1 0 0 0 0 0 0 0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0 0 0 0
00000
0
0
0
0
0
0
0
0
0 0 0 0
00
0
0 0 0 0
0
0
0
0
00
00
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
* Note that only one of the input lines is assumed to be active.
* What if two input lines become simultaneously active?→ There are “priority encoders” which assign a priority to each of the input lines.
M. B. Patil, IIT Bombay
![Page 338: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/338.jpg)
Encoders
O0
O1
O2
A0
A1
A2
A3
A4
A5
A6
A7
8−to−3 encoder example
Encoder
A0 A1 A2 A3 A4 A5 A6 A7 O0O1O2
1 0 0 0 0 0 0 0
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0 0 0 0
00000
0
0
0
0
0
0
0
0
0 0 0 0
00
0
0 0 0 0
0
0
0
0
00
00
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
* Note that only one of the input lines is assumed to be active.
* What if two input lines become simultaneously active?→ There are “priority encoders” which assign a priority to each of the input lines.
M. B. Patil, IIT Bombay
![Page 339: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/339.jpg)
74147 decimal-to-BCD priority encoder
74147
A9A8A7A6A5A4A3A2A1 O3 O2 O1 O0
1 1 1 1 1 1 1 1 1
X X 0
0
0
0
0
0
0
0
0
X X X X X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
11
1 1 1
0 01 1
0 111
01 00
1 0 0 1
1 0 01
1 0 1 1
1
1
1
1
1
1 1 0
0 1
0 0
1
O0
O1
O2
O3
A1
A2
A3
A4
A5
A6
A7
A8
A9
* Note that the higher input lines get priority over the lower ones.
For example, A7 gets priority over A1, A2, A3, A4, A5, A6. If A7 is active (low), the binary output is 1000(i.e., 0111 inverted bit-by-bit) which corresponds to decimal 7, irrespective of
A1, A2, A3, A4, A5, A6.
* The lower input lines are therefore shown as “don’t care” (X) conditions.
M. B. Patil, IIT Bombay
![Page 340: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/340.jpg)
74147 decimal-to-BCD priority encoder
74147
A9A8A7A6A5A4A3A2A1 O3 O2 O1 O0
1 1 1 1 1 1 1 1 1
X X 0
0
0
0
0
0
0
0
0
X X X X X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
11
1 1 1
0 01 1
0 111
01 00
1 0 0 1
1 0 01
1 0 1 1
1
1
1
1
1
1 1 0
0 1
0 0
1
O0
O1
O2
O3
A1
A2
A3
A4
A5
A6
A7
A8
A9
* Note that the higher input lines get priority over the lower ones.
For example, A7 gets priority over A1, A2, A3, A4, A5, A6. If A7 is active (low), the binary output is 1000(i.e., 0111 inverted bit-by-bit) which corresponds to decimal 7, irrespective of
A1, A2, A3, A4, A5, A6.
* The lower input lines are therefore shown as “don’t care” (X) conditions.
M. B. Patil, IIT Bombay
![Page 341: t t analog signal digital signal - NPTEL · 2017. 8. 4. · Digital circuits t t analog signal 0 1 high low digital signal * An analog signal x(t) is represented by a real number](https://reader035.vdocuments.mx/reader035/viewer/2022071508/6128f817ec6fde61517d9dc4/html5/thumbnails/341.jpg)
74147 decimal-to-BCD priority encoder
74147
A9A8A7A6A5A4A3A2A1 O3 O2 O1 O0
1 1 1 1 1 1 1 1 1
X X 0
0
0
0
0
0
0
0
0
X X X X X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
11
1 1 1
0 01 1
0 111
01 00
1 0 0 1
1 0 01
1 0 1 1
1
1
1
1
1
1 1 0
0 1
0 0
1
O0
O1
O2
O3
A1
A2
A3
A4
A5
A6
A7
A8
A9
* Note that the higher input lines get priority over the lower ones.
For example, A7 gets priority over A1, A2, A3, A4, A5, A6. If A7 is active (low), the binary output is 1000(i.e., 0111 inverted bit-by-bit) which corresponds to decimal 7, irrespective of
A1, A2, A3, A4, A5, A6.
* The lower input lines are therefore shown as “don’t care” (X) conditions.
M. B. Patil, IIT Bombay