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Multiplexer and Demultiplexer

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Multiplexing and demultiplexing are the two processes which are implemented on multiplexer and demultiplexer. This significantly reduces IC package count and there by reducing the system cost.


  • Logic circuit capable of accepting more than one input simultaneously and chooses one(more) input signal as output signal and is controlled by set of select inputs.
  • Constrained relation: 2m = n
    where m = a set of select inputs.
    n = set of input signals which is even.
    Y = output signal.
  • Enables multiple analog signals or digital data streams to be transferred along the same channel over a shared medium.
  • Increases the capacity of low level channels into high level channels.
  • Minimizes IC package count and logic design is simplified.
  • Example 4 : 1 multiplexer


  • Logic circuit that performs the reverse operation of multiplexer.
  • It accepts one input and circulates it over many outputs.
  • Select lines decides to which output the data input will be transmitted.
  • If it has 2n output lines, then it has n input lines.
  • Requires additional gates to realize Boolean expressions.
  • Used as binary-to-decimal decoder with binary inputs applied at select input lines.
  • Example 1 : 4 demultiplexer

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Tip Box

Multiplexer and Demultiplexer had played a major role in all types of communications by saving the cost of instruments.




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