Question

What is the basic requirement of multiplexer?

Answer 1

In electronics, a multiplexer (or mux) is a device that combines several analog or digitalinput signals and forwards them into a single output line. A multiplexer of {\displaystyle 2^{n}} inputs has {\displaystyle n} select lines, which are used to select which input line to send to the output

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Answer 2

Sending many signals separately is expensive and requires more wires to send. So there is a need of multiplexing.