page_title: Multiplexer
section_title: List of ICs which provide demultiplexing
hierarchical_section_title: Multiplexer / Digital demultiplexers / List of ICs which provide demultiplexing
caption_attribution_description: English: ROCKY-518HV - Fairchild 74F138 (1-of-8 Decoder/Demultiplexer)
context_page_description: In electronics, a multiplexer, also known as a data selector, is a device that selects between several analog or digital input signals and forwards it to a single output line. A multiplexer of inputs has 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. 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 analog-to-digital converter or one communications transmission medium, instead of having one device per input signal.
  Conversely, a demultiplexer 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.
context_section_description: The 7400 series has several ICs that contain demultiplexers:
caption: Fairchild 74F138
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