write lab report for digital fundamental

EET 2210 Lab 8

Implementing Truth Tables with Multiplexers

Objectives:

1. To implement a truth table using a Multiplexer

Background: Previously in lab to implement any truth tables you went through and did

a K-Map on the table and then created the circuit with discrete gates. With multiplexers

it is possible to go straight from a truth table to a circuit. You will use this idea in this

class to quickly implement a truth table.

Materials:

 75LS151A 8 to 1 MUX

 3 330 Ohm Resistors

 Dip Switches

Procedure:

A B C X

0 0 0 0

0 0 1 1

0 1 0 1

0 1 1 0

1 0 0 0

1 0 1 1

1 1 0 1

1 1 1 0

1. Start be wiring your Dipswitch. You will need 3 inputs to wire to the

multiplexer Be sure to wire one side of the switch to +5V and the other side

have a 330 ohm resistor going to ground.

2. Wire you three inputs from your switch to the input select pins to the

multiplexer.

3. Wire the inputs of the multiplexer to either +5V or to ground as appropriate

to implement the truth table above.

4. Wire digital inputs 0-2 to the three select inputs of the multiplexer and digital

input 3 to the output of the multiplexer.

5. Verify with your instructor that your circuit works.