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September 08, 2012

To design and implement De-multiplexer using basic logic gates.

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Apparatus required:-
The following electronics components are required.
·         NOT Gate (IC-7404)
·         AND Gate(IC-7411)
·         IC-74154
·         Digital IC Trainer KIT
·         Connecting wires
Description:-
The function of De-multiplexer is in contrast to multiplexer function. It takes information from one line and distributes it to a given number of output lines. For this reason, the demultiplexer is also known as a data distributor. Decoder can also be used as demultiplexer.
In the 1: 4 demultiplexer circuit, the data input line goes to all of the AND gates. The data select lines enable only one gate at a time and the data on the data input line will pass through the selected gate to the associated data output line.
Block Diagram of De-Multiplexer:-
Function Table for De-Multiplexer:-
S1
S0
INPUT
0
0
X → D0 = X S1’ S0’
0
1
X  → D1 = X S1’ S0
0
1
X  → D2 = X S1 S0’
1
1
X  → D3 = X S1 S0
Y = X S1’ S0’ + X S1’ S0 + X S1 S0’ + X S1 S0
Pin Diagram of IC-74154:-
Logic Diagram of De-Multiplexer:
Truth-Table:-
INPUT
OUTPUT
S1
S0
I/P
D0
D1
D2
D3
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
0
0
0
0
0
1
1
0
1
0
0
1
0
0
0
0
0
0
1
0
1
0
0
1
0
1
1
0
0
0
0
0
1
1
1
0
0
0
1
Conclusion: - All the output verified the result of Truth Table.
Precaution in lab:-
·         All the connections should be tight and proper.
·         Handle the ICs carefully.
·         Check the connection once again before Switching on the Digital Trainer KIT.
·         Switch of the Trainer Kit after performing the Experiment.

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