Experiment 2. Study of IC-74LS138 as a Demultiplexer / Decoder

  AIM: Study of IC-74LS138 as a Demultiplexer / Decoder 

1. Design and Implement full adder and subtractor function using IC-74LS138.
2. Design & Implement 3-bit code converter using IC-74LS138.(Gray to Binary/Binary to Gray)

    

THEORY:    

 Demultiplexer

It is a circuit having 1 input and many outputs. By applying control signals we can steer the input signal to one of the output lines. It accepts a signal and distributes to several outputs.

          A general block diagram of DMUX is as shown below:

                            Figure 1:  Demultiplexer

 Following are the types of demultiplexers:

   1:2 demultiplexers (1 I/P, 1 control line, 2 O/P)

  1:8 demultiplexers (1 I/P, 3 control lines, 8 O/P)

    1:16 demultiplexers (1 I/P, 4 control lines, 16 O/P)

Pre test

Procedure  

 

Breadboard implementation 

Simulation using Virtual lab

Post test

References