Multiplexer Vs Demultiplexer

Multiplexer	Demultiplexer
Many to one configuration is known as Multiplexer.	One to many configuration is known as Demultiplexer.
It is abbreviated in short as MUX.	It is abbreviated in short as DEMUX.
It selects one input and give it at the output. Thus, it is also known as data selector.	It selects single input at one of the output lines. Thus, it is also known as data distributor.
It contains 2n inputs and one output. Out of 2n one input is selected by selection line.	It contains one input and 2n outputs. Out of which one output is selected by selection line where the input line is connected.
Types of MUX are: 2:1, 4:1, 8:1, 16:1 etc.	Types of DEMUX are: 1:2, 1:4, 1:8, 1:16 etc.
Functional block diagram of MUX is as shown:	Functional block diagram of DEMUX is as shown:
Common ICs used for MUX are 74153, 74352, 74151A etc.	Common ICs used for DEMUX are 74139, 74154 etc.
Applications of MUX are data selection and routing, parallel to serial conversion, wave form generation, logic function generator etc.	Applications of DEMUX are in telecommunication to carry signal over long distances.