“MULTIPLEXER & DE-MULTIPLEXER”

PREPARED BY :

DISHANT PATEL 140123109009

VISHAL GOHEL 140123109003

KULDEEP THAKKAR 130120109058

GUIDED BY : Prof. shweta khakhakhar

Multiplexer and De-Multiplexer

A multiplexer is a circuit that accept many input but

give only one output.

A de-multiplexer function exactly in the reverse of a

multiplexer, that is a de-multiplexer accepts only one

input and gives many outputs.

Generally multiplexer and de-multiplexer are used

together.

Multiplexer

Multiplexer means many into one. A multiplexer

is a circuit used to select and route any one of

the several input signals to a signal output.

An simple example of an non electronic circuit of

a multiplexer is a single pole multi position

switch.

Uses of Multiplexers

Multi-position switches arewidely used in manyelectronics circuits.

However circuits that operateat high speed require themultiplexer to be automaticallyselected.

A mechanical switch cannotperform this task satisfactorily.Therefore, multiplexer used toperform high speed switchingare constructed of electroniccomponents.

Multiplexer

Types of Multiplexer

• Multiplexer handle two type of data that is analogand digital. For analog application, multiplexerare built of relays and transistor switches. Fordigital application, they are built from standardlogic gates.

• The multiplexer used for digital applications, alsocalled digital multiplexer, is a circuit with manyinput but only one output. By applying controlsignals, we can steer any input to the output. Fewtypes of multiplexer are 2-to-1, 4-to-1, 8-to-1, 16-to-1 multiplexer.

4-to-1 Multiplexer

The 4-to-1 multiplexer has 4input bit, 2 control bits, and 1output bit. The four input bitsare I0,I1,I2 and I3.

only one of this is transmittedto the output y.

The output depends on thevalue of S0 and S1 which is thecontrol input.

The control input determineswhich of the input data bit istransmitted to the output. 4-to-1 multiplexer

4-to-1 Multiplexer

S1 S0 F

0 0 I0

0 1 I1

1 0 I2

1 1 I3

Applications of Multiplexer

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

De-multiplexer

De-multiplexer means oneto many. A de-multiplexer is acircuit with one input andmany output.

By applying control signal,we can steer any input to theoutput. Few types of de-multiplexer are 1-to 2, 1-to-4,1-to-8 and 1-to 16 de-multiplexer. 1-to-4

De- multiplexer

1-to-4 De-MultiplexerA B Y0 Y1 Y2 Y3

0 0 1 0 0 0

0 1 0 1 0 0

1 0 0 0 1 0

1 1 0 0 0 1

Applications of De-Multiplexer

De-multiplexer is used to connect a single

source to multiple destinations. The main

application area of de-multiplexer is

communication system where multiplexer are

used.

Communication System

ALU (Arithmetic Logic Unit)

Serial to parallel converter

Comparison of Multiplexer and De-

MultiplexerSr. no. Parameter Multiplexer De-multiplexer

1 Type of logic circuit Combinational Combinational

2 No. of data inputs n 1

3 No. of select inputs m m

4 No. of data output 1 n

5 Relation between input/output

lines & select lines

n=2m n=2m

6 Operation principle Many to 1 or as data

selector

1 to many or data

distributor

7 Application •As a universal logic

cikt we can

implement any

combinational ckt

using a MUX.

We can implement

some combinational

ckt

Refrences

• J.S.Katre