2)nand nor prac 2
TRANSCRIPT
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Logic Design & Switching Circuits NAND-NOR GatesInstitute of Industrial Electronics
Engineering
Lab Session 02
NAND NOR Gates
OBJECTIVE
To Study the behavior of NAND & NOR gates.
APPARATUS
Power Supply
Resistors
LEDs
Jumper wires
DIP switches
Dual input NAND Gate (74LS00)
Dual input NOR Gate (74LS02)
THEORY:
NAND Gate:NAND Gate is a gate that has two or more than two input but only a single output.
Low output is obtained only and only if both the inputs are high. In all the other conditionhigh output is obtained.
INPUT OUTPUT
A B X
0 0 1
0 1 1
1 0 1
1 1 0
The Internal Structure of NAND Gate is Shown Below.
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7400 NAND Gate
22
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Logic Design & Switching Circuits NAND-NOR GatesInstitute of Industrial Electronics
Engineering
NOR Gate:
OR gate is a gate that has two or more than two input but only a single output. LOWoutput is obtained only and only if both the inputs are low. In all the other condition highoutput is obtained.
INPUT OUTPUT
A B X
0 0 1
0 1 0
1 0 0
1 1 0
The Internal Structure of NOR Gate is Shown Below.
7402 NOR Gate
Circuit Diagram:
For NAND Gate:
0V1
5 V
J1
2
0
R1
100
LED1
34
0
0
U1
74LS00N
1A
1B
1Y
2A
2B
2Y
GND 3Y
3B
3A
4Y
4B
4A
VCC
J2
0
1
5
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Logic Design & Switching Circuits NAND-NOR GatesInstitute of Industrial Electronics
Engineering
For NOR Gate:
0
V1
5 V
J1
2
0
R1
100
LED1
34
0
0
J2
0
5
U1
74LS02N
1A
1B
1Y
2A
2B
2Y
GND
3Y
3B
3A
4Y
4B
4A
VCC
6
PROCEDURE:
Construct the circuit as shown below.
Now close the dip switch and power-on the voltage source.
Observe the status of the LED.
Now open the dip switch and placed to ground state one by one and observe the
status of the LED.
SIMULATION RESULTS:NAND-Gate:
NOR-Gate:
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Logic Design & Switching Circuits NAND-NOR GatesInstitute of Industrial Electronics
Engineering
OBSERVATIONS:
NAND-Gate:From the circuit It is being observed that the results are in accordance with the truth
table, when we close one or both the dip switches the LED turns off while it is luminescentwhen the both the switches are open. Hence we have the Truth Table as our ObservationTable:
INPUT OUTPUT
A B X
0 0 1
0 1 1
1 0 1
1 1 0
NOR-Gate:We observed that the results are in accordance with the truth table, when we closes
both the dip switches the LED turns off while it is luminescent when one or both theswitches are open. Hence we have the Truth Table as our Observation Table:
INPUT OUTPUT
A B X
0 0 1
0 1 0
1 0 0
1 1 0
CONCLUSION:We conclude that both the gates reacted as predicted by their respective truth table.