Government Engineering College,Gandhinagar

Instrumentation and Control Engineering

Sub:-DLC(2131704)

Acharya Manali 150130117001

Mistry Ankit 150130117002

Ic-A1

Prepared By:-

Topic :- Basic 4 Input Multiplexer

WHAT IS MULTIPLEXER?• A MULTIPLEXER is a digital circuit that has

multiple inputs and a single output.• Multiplexer means many into one. • The selection of one of the n inputs is done by

the select inputs• It has one output selected at a time.• It is also known as DATA SELECTOR.• An simple example of an non electronic circuit of a

multiplexer is a single pole multi position switch.• A multiplexer has

N data inputs(multiple)1 output (single)M select inputs, with 2M =N

Single Pole Multi Position Switch

BLOCK DIAGRAM OF MULTIPLEXER :

Types : 2-to-1 (1 select line)

4-to-1 (2 select lines)

8-to-1 (3 select lines)

16-to-1 (4 select lines)

4-to-1 Multiplexer:• The 4-to-1 multiplexer has 4 input bit, 2 control bits, and

1 output bit.

• The four input bits are I0,I1,I2 and I3. Only one of this is transmitted to the output y.

• The output depends on the value of S0 and S1 which is the control input.

• The control input determines which of the input data bit is transmitted to the output.

4-to-1 multiplexer

• Another example of 4-to-1 multiplexer is 45352 in which the output is the compliment of the input.

• An example of 4-to-1 multiplexer is IC 74153 in which the output is same as the input.

4-to-1 Multiplexer

S1 S0 F

0 0 I0

0 1 I1

1 0 I2

1 1 I3

4-to-1 (2 select lines) Multiplexer

4:1 MUX has 4 inputs(D0, D1, D2, D3) & 2 select lines(S0, S1)

S1 S0 Y

0 0 D0

0 1 D1

1 0 D2

1 1 D3

MU

XD0

D1

D2

D3

Y

S1 S0

BLOCK DIAGRAMTRUTH TABLE

The logical level applied to the S input determines which AND gate is enabled, so that its data input passes through the OR gate to the output.

The output, Y=S1’S0’D0+S1’S0D1+S1SO’D2+S1S0D3

Uses of MultiplexersUsed in data communications for several computers to

communicate over 1 line

Used in radio to select one channel from many

Used to route data within a computer

Used for function generation

Multi-position switches are widely used in many electronics circuits. However circuits that operate at high speed require the multiplexer to be automatically selected.

A mechanical switch cannot perform this task satisfactorily. Therefore, multiplexer used to perform high speed switching are constructed of electronic components.

APPLICATION OF MULTIPLEXER:

MP3 PlayerDocking Station

Laptop Sound Card

DigitalSatellite

DigitalCable TV

Surround Sound System

MUX

D0

D1

D2

D3

Y

B A Selected Source

0 0 MP3

0 1 Laptop

1 0 Satellite

1 1 Cable TV

Multiple SourcesSingle

DestinationSelector

• Multiplexer are used in various fields where multiple data need to be transmitted using a single line. Following are some of the applications of multiplexers

• Communication system

• Telephone network

• Computer memory

• Transmission from the computer system of a satellite