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Multiplexers (MUX) and Demultiplexers (DEMUX) are essential combinational circuits used in digital electronics. A multiplexer selects binary information from multiple input lines and directs it to a single output line, utilizing selection inputs. MUX can be constructed using decoders with AND gates, enabling flexible data selection. On the other hand, a demultiplexer serves as the inverse of a multiplexer, transmitting data from one input line to multiple output lines based on selection inputs. These components are vital for efficient data routing in electronic systems.
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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. • 2ninput lines. • n selection inputs. • Data selector • Selects one of many inputs and steers binary information to output line.
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 • 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 • 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 • Identical to 2-to 4 line decoder with enable output.
