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Table of contents
1.
Introduction
2.
What is a Multiplexer?
3.
What is a Demultiplexer?
4.
Differences between Multiplexer and Demultiplexer
5.
Frequently Asked Questions
5.1.
What is the difference between multiplexer and demultiplexer?
5.2.
What is a multiplexer with an example?
5.3.
What is a demultiplexer with an example?
5.4.
What are the applications of multiplexer and demultiplexer?
6.
Conclusion
Last Updated: Mar 27, 2024
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Difference between Multiplexer and Demultiplexer

Author Sourabh
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23 Jul, 2024 @ 01:30 PM

Introduction

A multiplexer is a combinational circuit that takes in many data inputs and gives out only one output. On the other hand, a demultiplexer is a combinational circuit that takes in one input and sends it out through many outputs.

An alternative name for a multiplexer is MUX or data selector. A demultiplexer takes one input signal and generates multiple. So it is also known as Demux or data distributor.

Multiplexer and Demultiplexer

This article will go through the differences between multiplexers and demultiplexers. We will also discuss their real-world applications.

What is a Multiplexer?

A multiplexer belongs to a combinational circuit that has 2^n input lines and one output line. Simply put, a multiplexer is a combinational circuit with multiple inputs and one output. Binary information in the multiplexer is received from the input lines and routed to the output line. Based on the values ​​of the selection lines and one of the data inputs will be connected to the output.

Unlike the encoder and decoder, there are n sample lines and 2^n input lines. So there are a total of 2^n possible input combinations. A multiplexer is also considered a Mux.

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What is a Demultiplexer?

A demultiplexer is a combinational circuit that reverses the operation of a multiplexer. It has one input, "n" selection lines, and at most 2^n outputs. The input will then be connected to one of the outputs based on the values ​​of the selection lines.

There are 'n' selection lines in the demultiplexer, and there will be 2^n possible combinations of zeros and ones. So each combination can only select one output. Demultiplexer is also called Demux.

Also see, Difference Between Jfet and Mosfet

Differences between Multiplexer and Demultiplexer

Multiplexer

Demultiplexer

A multiplexer is a combinational circuit element. It selects one of many inputs as output depending on the input(s) of the selection lines. A demultiplexer is a combinational circuit element used to route an input to one of many output lines depending on the input(s) of the selection line(s).
It has multiple input pins. It has only one input pin except for select lines.
It has only one output pin. It has multiple output pins.
If a multiplexer has a 2^n number of input lines, then it will have an n number of selection lines or vice versa. If a demultiplexer has n number of selection lines, then it will have 2^n number of output lines or vice versa.
Purpose Multiplexer works like a digital switch. Demultiplexer acts as a signal allocator. A demultiplexer is used for demultiplexing purposes in communication schemes like TDM, serial to parallel converters, etc.
Multiplexers are Asynchronous in nature. Demultiplexers are Synchronous in nature.

Refer this to know about Difference Between List and Set here.

Frequently Asked Questions

What is the difference between multiplexer and demultiplexer?

Multiplexer takes multiple input signals and selects one based on control inputs, after which it forwards the chosen input to a single output line. Demultiplexer takes a single input and allocates it to one of the multiple output lines based on control inputs.

What is a multiplexer with an example?

A multiplexer is a combinational circuit element which selects one of many inputs as output depending on the input(s) of the selection lines. For example, a 4:1 multiplexer can choose one of four data inputs to be transmitted to the output based on the selected inputs.

What is a demultiplexer with an example?

A demultiplexer is a combinational circuit element that routes input to one of many output lines based on the input(s) of the selection line(s). For example, a 1:4 demultiplexer can direct the input signal to one of four output lines based on the selected inputs.

What are the applications of multiplexer and demultiplexer?

A multiplexer is used in communication systems, computer memories, Programmable Logic Unit (PLC) systems, etc. A demultiplexer is widely used in a reverse process to separate the signal back into individual signals in communication and demodulation applications.

Conclusion

As you can see that we have reached the end of this blog. Now let us see what we have discussed so far. This is the conclusion of this article Communication systems are bi-directional in nature, due to which multiplexers and demultiplexers are also necessary. The functions carried out by these two devices are completely opposite with respect to each other.

If you want to learn more about Multiplexers, visit our blog.

If you want to learn more about Demultiplexers, visit our blog. 

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