# Difference Between Multiplexer and Demultiplexer

By BYJU'S Exam Prep

Updated on: September 25th, 2023

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.

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## 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

 Multiplexer Demultiplexer 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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