Difference Between Multiplexer and Demultiplexer

By Mohit Uniyal|Updated : September 28th, 2022

Multiplexers or MUX and demultiplexers or DEMUX differ due to their ability to accept and produce varied outputs. Both are a type of combinational circuit and are used to derive the desired outputs. Here, in this article, we have provided the difference between multiplexers and demultiplexers.

Difference between a Multiplexer and a Demultiplexer PDF

The combinational circuits are those circuits for which present outputs do not depend on past inputs but only on present inputs. The basic Difference between a Multiplexer and a Demultiplexer is that a multiplexer is a combinational circuit that accepts numerous data inputs but only produces one output. The demultiplexer is a combinational circuit that takes a single input and distributes it to multiple outputs. Along with the difference between multiplexer and demultiplexer, we will briefly explore the multiplexer and demultiplexer.

Difference Between Multiplexer and Demultiplexer

The combinational and sequential circuits are a major part of digital electronics. The difference between multiplexer and demultiplexer is an important topic in the GATE CSE syllabus

Key Difference Between Multiplexer and Demultiplexer

MultiplexerDemultiplexer
A multiplexer is a combinational circuit that accepts numerous data inputs but only produces one output.The demultiplexer is a combinational circuit that takes a single input and distributes it to multiple outputs.
A digital switch is referred to as a multiplexer.A demultiplexer is a digital circuit that demultiplexes signals.
It requires multiple inputs of data and signals.It requires single input of data and signals.
It has single data output.It has n data output.
It is used at the transmitter end in time-division multiplexing.It is used at the receiver end in time-division multiplexing.

Multiplexer and Demultiplexer

Multiplexer and Demultiplexer are a type of combinational circuits. The difference between them arises with the number of inputs received and their outputs. Let us understand each of them in detail.

What is Multiplexer?

Multiplexers are the combinational circuits in digital electronics. A multiplexer (or mux; often written multiplexor), also known as a data selector, is a device that chooses one of numerous analog or digital input signals and sends it to a single output line. The second set of digital inputs, known as select lines, controls the selection. A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output.

Instead of having one device per input signal, a multiplexer allows numerous input signals to share one device or resource, such as an analog-to-digital converter or a communications transmission channel. Multiplexers can also be utilized to implement multiple-variable Boolean functions.

What is Demultiplexer?

A demultiplexer (or demux) is a device that takes a single input and selects signals from the compatible mux's output, which is linked to the single input and a common selection line. On the receiving end, a multiplexer is frequently used in conjunction with a complementary demultiplexer.

A demultiplexer is essentially a combinational circuit that can receive only one data input but distributes it to multiple outputs. In a nutshell, it's the inverse of a multiplexer, although they're not diametrically opposed. It deconverts a signal into its constituent signals, which are unrelated and distinct.

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FAQs on Difference Between Multiplexer and Demultiplexer

  • The major difference between multiplexer and demultiplexer is provided below.

    • A multiplexer is a sort of combinational circuit that accepts numerous data inputs but only produces one output.
    • A demultiplexer is a sort of combinational circuit that takes a single input and distributes it to multiple outputs.
  • A multiplexer (MUX) is a network device that allows one or more analog or digital input signals to share a single communications transmission channel. It works as a digital switch.

  • A demultiplexer (also known as a demux or data distributor) is a circuit that allows multiple outputs to be distributed or delivered from a single input. It can function as a single input with a large number of output switches.

  • There is no logic type difference between multiplexer and demultiplexer. Both of them follow the combinational logic type. The multiplexer accepts multiple inputs of data but provides only a single output whereas a demultiplexer accepts a single input but provides it through n outputs.

  • The difference between multiplexer and demultiplexer with respect to the technique of conversion is as follows.

    • A multiplexer is a device that converts parallel data into serial data.
    • However, a demultiplexer is a device that converts serial data into parallel data.

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