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Multiplexers/ Demultiplexers. Multiplexer. Combinational circuit that selects binary information from one of many input lines and directs information to a single output line . Multiplexer ctd …. Selection inputs. 2 n input lines. n selection inputs. Data selector

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Multiplexers demultiplexers

Multiplexers/ Demultiplexers


Multiplexer
Multiplexer

  • Combinational circuit that selects binary information from one of many input lines and directs information to a single output line.


Multiplexer ctd
Multiplexer ctd …

  • Selection inputs.

  • 2ninput lines.

  • n selection inputs.

  • Data selector

    • Selects one of many inputs and steers binary information to output line.



Decoders in multiplexers
Decoders in Multiplexers

  • AND gates and inverters in multiplexer resemble a decoder circuit.

  • 2n - to – 1 line MUX is constructed from n-to- 2n decoder by adding 2n input lines.

  • MUX blocks can be combined in parallel with common selection & enable lines.


Quadruple 2 to 1 line multiplexer
Quadruple 2-to-1 Line Multiplexer

  • 4 multiplexers

  • Each capable of selecting one of two input lines.

    1A

  • 1Y

    1B

  • Input selection line S selects one of lines in each of four MUXs.

  • Enable input E must be active for normal operations.


Demultiplexer
Demultiplexer

  • Inverse of MUX

  • Demultiplexer receives information from a single line and transmits it to one of 2n possible output lines.

  • Selection of specific output is controlled by bit combination of n selection lines.



Demultiplexer decoder
Demultiplexer / Decoder

  • Identical to 2-to 4 line decoder with enable output.