Assignment#4a

Design and Implement a 4:1 multiplexer using 74153 IC.

1. Digital Technique Mrs. Sunita M Dol
Page 1
HANDOUT#4a

AIM:
Design and Implement a 4:1 multiplexer using 74153 IC.

LEARNING OBJECTIVES:
- Implement the Boolean expression in SOP and POS form using 4:1
multiplexer.

COMPONENT REQUIRED:
- Logic gates (IC) trainer kit.
- Connecting patch chords.
- IC 74153

Sr. No. Component Specification
1 4:1 mux IC74153

THEORY:
Mutiplexer or data selector is the combinational circuit that gets one out of
several inputs to a single output.
In multiplexer, the input selected is controlled by a set of select lines. For
selecting one out of n inputs for connection to the output, a set of m select
lines is required where 2
m
=n.
Depending upon the digital code applied at select lines, one out of n data
sources is selected and transmitted to a single output channel.
A strobe or enable input G is incorporated which helps in cascading and it is
generally active low which means it perform its intended operation when it
is low.
IC 74153 Description
o The integrated circuit 74153 contains two multiplexers with 4 ways at
entries of selection A and B communes. Each multiplexer has an entry
of validation G(STROBE). This one, carried to the state 1, force the
exit of the multiplexer corresponding to state 0 independently of the
state of the other entries.

2. Digital Technique Mrs. Sunita M Dol
Page 2




Figure a: Pin diagram

Truth table:

Select Input Output
Y 1E S1 S0
1I0 0 0 0 0
1I1 0 0 1 1
1I2 0 1 0 2
1I3 0 1 1 3

Select Input Output
Y 2E S1 S0
2I0 0 0 0 0
2I1 0 0 1 1
2I2 0 1 0 2

3. Digital Technique Mrs. Sunita M Dol
Page 3
2I3 0 1 1 3

PROCEDURE:
1. Check the components for their working.
2. Insert the appropriate IC into the IC base.
3. Make connections as shown in the circuit diagram.
4. Provide the input data via the input switches and observe the output on
output LEDs
5. Give various combinations of inputs and note down the output with help of
LED for all gate ICs one by one.

RESULT:
Thus we have implemented 4:1 multiplexer using 74153 IC