Multiplexers are very useful components in digital systems. They transfer a large

number of information units over a smaller number of channels, (usually one channel)

under the control of selection signals. Multiplexer means many to one. A multiplexer is

a circuit with many inputs but only one output. By using control signals (select lines)

we can select any input to the output. Multiplexer is also called as data selector because

the output bit depends on the input data bit that is selected. The general multiplexer

circuit has 2

n

input signals, n control/select signals and 1 output signal.