Multiplexers and Demultiplexers

Multiplexer
A multiplexer or MUX, also called a data selector, is a combinational circuit with more than one
input line, one output line and more than one selection line. There are some multiplexer ICs that
provide complementary outputs. Also, multiplexers in IC form almost invariably have an ENABLE
or STROBE input, which needs to be active for the multiplexer to be able to perform its intended
function. A multiplexer selects binary information present on any one of the input lines, depending
upon the logic status of the selection inputs, and routes it to the output line. If there are n selection lines, then the number of maximum possible input lines is 2n and the multiplexer is referred to as a 2n-to-1 multiplexer or 2n ×1 multiplexer.