logic laboratory report manuscript

8/3/2019 Logic Laboratory Report Manuscript

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PROCEDURESPart A. AND FunctionStep1.

Turn the logic trainer off.

Step2.Insert the 7408 logic IC at the trainer. Connect data switches to the A and B Inputs of

one of the AND gates .See figure1. Do not forget the connecting wires to supply terminals of

the ICs.

Step3.Turn the trainer on. Move the data switches to high and/or low positions as indicated in

table1. Observe the LED and measure the voltage at the output using a DVN. Record

observations in Table1

Step4.Turn the logic trainer off before removing the IC and connecting wires.

PART B .OR FunctionStep1.


Step2.Insert the 7432 logic IC at the trainer. Connect the data switches to the A and B inputs

of one of the OR gates. See figure2. Do not forget the connecting wires to the supply terminals

of the ICs.






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PART C. NOT FunctionStep1.



of one of the NOT gates. See figure3. Do not forget the connecting wires to the supply

terminals of the ICs.





PART D. N AND FunctionStep1.



of one of the N AND gates. See figure4. Do not forget the connecting wires to the supply







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PARTE. NOR FunctionStep1.



of one of the NOR gates. See figure5. Do not forget the connecting wires to the supply






PART F. XOR FunctionStep1.



of one of the XOR gates. See figure6. Do not forget the connecting wires to the supply







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Review Questions:

1. What is the output voltage of a TTL IC for logic 1? For logic 0?

-The output voltage for logic 1 is 4v and 0v for logic 0.

2. Compare the output voltage of a TTL IC with the voltages obtained in

the experiment?

-The maximum or high voltage obtained is 4v and 0v for low or minimum voltage.

3. What is the only combination that will produced a HIGH logic label at

the output of a five input AND gate?

-When all the inputs are Logic 1

4. What is the only input combination that will produced a LOW logic

level at the output of five inputs OR gate?

-When all the inputs are Logic 0

5. Is an AND gate output always different from an OR gate output for the

same input condition? Prove.

-on a same condition of inputs there are two moments that they will be having the sameoutput, that is when the input are both the same or if inputs are both logic 1 and both

logic 0.

6. If the output of a NOT gate is connected to the input of a second NOT,

what is the output level of the second not gate?


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-the output on the second level will be the opposite of the output on the first level of the

NOT gate.

7. Determine the waveform at the output of the NAND gate for the input

waveform shown in the figure?

DATA RESULTS

Figure 1

Table 1

A B OUT V out

0 0 0 00 1 1 41 0 1 41 1 1 4

Figure 2


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Table 2

A B OUT V out

0 0 0 0

0 1 1 4

1 0 1 4

1 1 1 4

Figure 3

Table 3

A OUT V out

0 1 3.81 0 0

Figure 4


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Table 4

A B OUT V out

0 0 1 4

0 1 1 4

1 0 1 4

1 1 0 0

Figure 5

Table 5

A B OUT V out

0 0 1 4

0 1 0 0

1 0 0 0

1 1 0 0


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Figure 6

Table 6

A B OUT V out

0 0 0 0

0 1 1 4

1 0 1 4

1 1 0 0

Analysis

On our experiment based on tabulated data from the same inputs on 6 different Logic

ICs. There are logic gates that have same output based on their same input. Some have an

opposite characteristic of the other logic gates. There are times that there will be a loss on the

output voltage.

Conclusion

Logic gates or logic ICs have their different characteristics based on their used.


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University of the East

College of Engineering

ECE-Department

LOGIC GATE IC FAMILIARIZATION

Experiment no 1.


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Submitted by:

Lider:

Bautista,Roan Albert

Member: Date performed: November 21, 2011

Cielo, Nilo T. Date Submitted: January 09, 2012

Canayon,Seigfred

Submitted To:

ENGR. Ramos

Rating

Introduction

logic gate is an elementary building block of a digitalcircuit . Most logic gates have twoinputs and one output. At any given moment, every terminal is in one of the two binaryconditions low(0) orhigh (1), represented by different voltage levels. The logic state of aterminal can, and generally does, change often, as the circuit processes data. In most logicgates, the low state is approximately zero volts (0 V), while the high state is approximately fivevolts positive (+5 V).

There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR.

TheAND gate is so named because, if 0 is called "false" and 1 is called "true," the gate

acts in the same way as the logical "and" operator. The following illustration and table showthe circuit symbol and logic combinations for an AND gate. (In the symbol, the input terminalsare at left and the output terminal is at right.) The output is "true" when both inputs are "true."Otherwise, the output is "false."The OR gate gets its name from the fact that it behaves after the fashion of the logical

inclusive "or." The output is "true" if either or both of the inputs are "true." If both inputs are

"false," then the output is "false."
http://searchcio-midmarket.techtarget.com/definition/digitalhttp://searchcio-midmarket.techtarget.com/definition/digitalhttp://searchcio-midmarket.techtarget.com/definition/circuithttp://searchcio-midmarket.techtarget.com/definition/circuithttp://searchcio-midmarket.techtarget.com/definition/binaryhttp://searchcio-midmarket.techtarget.com/definition/circuithttp://searchcio-midmarket.techtarget.com/definition/binaryhttp://searchcio-midmarket.techtarget.com/definition/digital


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The OR gate gets its name from the fact that it behaves after the fashion of the logical

inclusive "or." The output is "true" if either or both of the inputs are "true." If both inputs are

"false," then the output is "false."

A logical inverter, sometimes called a NOT gate to differentiate it from other types of electronic

inverter devices, has only one input. It reverses the logic state.

The NAND gate operates as an AND gate followed by a NOT gate. It acts in the manner of the

logical operation "and" followed by negation. The output is "false" if both inputs are "true."

Otherwise, the output is "true."

The NAND gate operates as an AND gate followed by a NOT gate. It acts in the manner of the

logical operation "and" followed by negation. The output is "false" if both inputs are "true."

Otherwise, the output is "true."

TheXNOR (exclusive-NOR) gate is a combination XOR gate followed by an inverter. Its output

is "true" if the inputs are the same and false" if the inputs are different.

Using combinations of logic gates, complex operations can be performed. In theory, there is nolimit to the number of gates that can be arrayed together in a single device. But in practice,

there is a limit to the number of gates that can be packed into a given physical space. Arrays of

logic gates are found in digital integrated circuits (ICs). As IC technology advances, the

required physical volume for each individual logic gate decreases and digital devices of the

same or smaller size become capable of performing ever-more-complicated operations at

ever-increasing speeds.

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