What is multiplexer(MUX)? & (2:1 MUX ,4:1 MUX ,8:1 MUX )...

What is multiplexer(MUX)? & (2:1 MUX ,4:1 MUX ,8:1 MUX )...

What is multiplexer ?
Ans:- It is a combinational digital logic circuit  which consist of many input and gives output through a single common line with the help of select line.

If small 'n' is the no of select line and 'N' is the no of data input line/input line.
          

Hence the MUX can be named as 2:1 ,4:1 ,8 1 ,16:1........as so on.

* MUX is a universal device.

                   2:1  MUX

nd

This MUX consist of two data input line and one data select line and switches through a single output line.

Let us consider 'Io' and 'I1' is the data input line and 'So' the select line.

Truth table of 2:1 MUX.

Expression of 2:1 MUX.

Realisation of 2:1 MUX.

                           4:1 MUX

This MUX consist of four data input line and two data select line and  switching through a single output line.

Let us consider  Io, I1, I2 and I3 are the data input line and So and S1 are  data select line.

Truth table of 4:1 MUX.

Expression of 4:1 MUX.

Realisation of 4:1 MUX.

•                    8:1 MUX 

This MUX of eight data input line and three data select line and switches through a single common line.

Let us consider  Io,I1,I2, I3, I4, I5, I6, & I7 are data input line and So, S1 &  S2 are data select line.

Truth table of8:1 MUX.

Expression of 8:1 MUXa.

Realisation of 8:1 MUX.

If you have any kind of mistake then please comment.