Logic Gates

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Logic Gates

Experiment #1

Title:     Logic Gates

Objective:     To analyze and become familiar with the operation of TTL Logic Gates.

Equipment:     Digital Trainer
        AND Gate (7408)
        NAND Gate (7400)
        OR Gate (7432)
        NOR Gate (7402)

Procedure:

1) For each gate predict the output for all combinations of inputs. Write the truth table and describe the operation for the circuit.

2) Build each of the logic circuits to determine if it does operate as expected. Record the results.

3) Have it checked by the Instructor of Lab Tech.

Diagrams

AND Gate (7402)

NAND Gate (7400)

OR Gate (7432)

NOR Gate (7402)

Truth Tables

AND Gate (7408)

A     B     OUTPUT
0     0     0
0     1     0
1     0     0
1     0     1

NAND Gate (7400)

A     B     OUTPUT
0     0     1
0     1     1
1     0     1
1     1     0

OR Gate (7432)

A     B     OUTPUT
0     0     0
0     1     1
1     0     1
1     1 1

NOR Gate (7402)

A     B     OUTPUT
0     0     1
0     1     0
1     0     0
1     1     0

Discussion

In the experiment for the AND Gate, the red lead from the power pack in connected to pin #14 (Vcc). The black lead from the power pack in connected to pin #7, which is the ground. Both HIGH inputs from the Vcc are connected to pin #1 and pin #2. Output pin #3 is connected to the positive side of the LED, while the other side of the LED is connected to the ground. The LED lights up, because HIGH is present at pin #3 of the AND Gate. The power connections are the ...

Submitted by: digitalessays
Date Submitted: 01-08-2003
Category: Miscellaneous
Words: 851
Pages: 3.4