Multiplexers

A Multiplexer is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. A multiplexer can be as simple as having two inputs, one output, and one select line. If a logic multiplexer is present on the select line, it might choose input A that would be passed to the output. If the select line had a logic zero, then it would then select input B to be passed through to the output of the multiplexer.