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.

Multiplexer

• 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: 2^m = 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

DeMultiplexer

• 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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