Multiplexer and Demultiplexer

What is Multiplexer ?

Multiplexer is a combinational circuit that has 2n input lines and one of these inputs goes to single output lines. To select one from given 2n inputs, we have n selection lines. A multiplexer with 2n input lines and 1 output line is known as 2n to 1 multiplexer. It is also known as data selector as it selects one of many inputs and directs it to output line.

Block Diagram of Multiplexer

What is Demultiplexer?

Demultiplexer is also a combinational circuit whose function is just opposite to that of multiplexer. Demultiplexer has one input line and 2n output lines. The specific output line is selected by using n selection lines.

Block Diagram of demultiplexer

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