Digital Teaching Aid (DED Philippinen, 86 p.)
 Data Processing Circuits - Lesson 9
 Lesson Plan Handout No. 3 Worksheet No. 9

### Handout No. 3

Example for Multiplexer Solution

Problem: Design a logic circuit for the problem which is given through the truth table below. Use a 74150 to implement this table:

 A B C D Y 0 0 0 0 1 0 0 0 1 0 0 0 1 0 1 0 0 1 1 1 0 1 0 0 1 0 1 0 1 1 0 1 1 0 0 0 1 1 1 0 1 0 0 0 1 1 0 0 1 1 1 0 1 0 1 1 0 1 1 1 1 1 0 0 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1

Solution: Complement each Y output to get the corresponding data input:

D0 = 1 = 0

Dl = 0 =

D2 =

D3 =

D

D

D

D

D
D
D
D
D
D
D
D15=

Connect: the chip in response to the list of corresponding data inputs:

Figure

Universal Logic Circuit

This circuit is an example of multiplexer logic. You ................. an input data pin when the corresponding output is ............... in the truth table.

You connect an input data pin to .............................. if the corresponding output is..................... in the truth table.