demultiplexereiden

Demultiplexereiden are electronic devices that perform demultiplexing, routing a single input signal to one of several outputs under the control of select lines. They are the inverse of multiplexers (MUX). In digital logic, a demultiplexer typically has one data input, a set of select inputs that choose which output line will carry the input, and sometimes an enable input. When enabled, the input D appears at exactly one of the 2^n outputs, determined by the binary value of the select lines; all other outputs are inactive. If the enable input is deasserted, all outputs may be forced to a defined inactive state.

Most demultiplexereiden are implemented as decoders with an enable, and come in forms such as 1-to-2, 1-to-4, 1-to-8, or 1-to-16, corresponding to 2^n outputs. They are used to route a single data stream to a chosen path in a data bus or to distribute addressing signals in memory and peripheral interfaces. In practice, digital demultiplexereiden are commonly built from TTL or CMOS logic and are designed to operate in concert with multiplexers and decoders in complex data paths.

Analog variants of demultiplexereiden exist for routing an analog signal to one of several outputs, often implemented as switch matrices or multiplexed switches controlled by digital select lines. These devices are used in telecommunications, video routing, test equipment, and instrumentation where selectable signal paths are required.

Key design considerations include propagation delay, fan-out, power consumption, and the required level of isolation between outputs. Depending on the application, demultiplexereiden may provide active-high or active-low outputs and may include additional buffering or inversion. See also multiplexers and decoders.