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Monday, April 4, 2011

MULTIPLEXER & DEMULTIPLEXER


            MULTIPLEXER & DEMULTIPLEXER

AIM:                           

To design and verify the truth table of a 4X1 Multiplexer & 1X4 Demultiplexer.      

APPARATUS REQUIRED:

S.No
Name of the Apparatus
Range
Quantity
1.
Digital IC trainer kit

1
2.
OR gate
IC 7432

3.
NOT gate
IC 7404

4.
AND gate ( three input )
IC 7411

5.
Connecting wires

As required

THEORY:

Multiplexer is a digital switch which allows digital information from several sources to be routed onto a single output line.  The basic multiplexer has several data input lines and a single output line.  The selection of a particular input line is controlled by a set of selection lines.  Normally, there are 2n input lines and n selector lines whose bit combinations determine which input is selected.  Therefore, multiplexer is ‘many into one’ and it provides the digital equivalent of an analog selector switch.

 A Demultiplexer is a circuit that receives information on a single line and transmits this information on one of 2n possible output lines.  The selection of specific output line is controlled by the values of n selection lines.


DESIGN:
4 X 1 MULTIPLEXER

LOGIC SYMBOL:

TRUTH TABLE:

S.No
SELECTION INPUT
OUTPUT
S1
S2
Y
1.
0
0
I0
2.
0
1
I1
3.
1
0
I2
4.
1
1
I3

PIN DIAGRAM OF  IC 7411:


CIRCUIT DIAGRAM:




1X4 DEMULTIPLEXER


LOGIC SYMBOL:




TRUTH TABLE:


S.No
INPUT
OUTPUT
S1
S2
Din
Y0
Y1
Y2
Y3
1.
0
0
0
0
0
0
0
2.
0
0
1
1
0
0
0
3.
0
1
0
0
0
0
0
4.
0
1
1
0
1
0
0
5.
1
0
0
0
0
0
0
6.
1
0
1
0
0
1
0
7.
1
1
0
0
0
0
0
8.
1
1
1
0
0
0
1












CIRCUIT DIAGRAM:




PROCEDURE:

  1. Connections are given as per the circuit diagrams.
  2. For all the ICs 7th  pin is grounded and 14th pin is given +5 V supply.
  3. Apply the inputs and verify the truth table for the multiplexer & demultiplexer.


RESULT:

The design of the 4x1 Multiplexer and 1x4 Demultiplexer circuits was done and their truth tables were verified.



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