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Multiplexer

Device for mixing television signals to a single video recorder.
Multiplexer2

Device for mixing television signals to a single video recorder.

In electronics, a multiplexer (or mux) is a device that selects between several analog or digital input signals and forwards it to a single output line. A multiplexer of 2 n {\displaystyle 2^{n}} 2^{n} inputs has n {\displaystyle n} n select lines, which are used to select which input line to send to the output. Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth. A multiplexer is also called a data selector. Multiplexers can also be used to implement Boolean functions of multiple variables.

An electronic multiplexer makes it possible for several signals to share one device or resource, for example, one A/D converter or one communication line, instead of having one device per input signal.

Conversely, a demultiplexer (or demux) is a device taking a single input and selecting signals of the output of the compatible mux, which is connected to the single input, and a shared selection line. A multiplexer is often used with a complementary demultiplexer on the receiving end.

An electronic multiplexer can be considered as a multiple-input, single-output switch, and a demultiplexer as a single-input, multiple-output switch. The schematic symbol for a multiplexer is an isosceles trapezoid with the longer parallel side containing the input pins and the short parallel side containing the output pin. The schematic on the right shows a 2-to-1 multiplexer on the left and an equivalent switch on the right. The s e l {\displaystyle sel} sel wire connects the desired input to the output.

Key Terms

definition
demultiplexer
device
electronic multiplexer
multiplexer
multiplexers
output
right
single input
usage

Additional Resources

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Acronymn

MUX

Synonymns

Multiplexer
(none found)
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