To design 4 to 16 decoder using 3 to 8 decoder IC-74138





  1. Click on the components button and place all the component.
  2. Make connections as per the circuit diagram and pin diagram of ICs.
    3. Fig.1 Circuit diagram of 4-to-16 decoder
    Fig.2 Pin diagrams of IC 74138 and IC7404
  3. Click on Check Connections button. If connections are right, click on ‘OK’, then Simulation will become active.
  4. Provide the input by clicking toggle switches A, B, C and D.
  5. Fill the observed values in the Truth Table.
  6. Verify Truth Table by clicking on Check button, if outputs are correct then click on OK.

Truth table

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