# Difference between Decoder and Demultiplexer

Both the decoder and the demultiplexer are combinational logic circuits. The primary distinction between these combinational logic circuits is that a decoder translates input streams from one format to another. In contrast, the demultiplexer routes data from one input line to any of the various output lines. A decoder is an example of a type of demultiplexer. Furthermore, a decoder is a demultiplexer that doesn't have a data input stream and has inputs rather than select lines. When enable is utilized in a decoder circuit, it closely resembles a demultiplexer.

In this article, you will learn about the difference between Decoder and Demultiplexer. But before discussing the differences, you must know about Decoder and Demultiplexer.

## What is Decoder?

The decoder is a combinational logic circuit that decodes the information, data, and documents. It has an n number of input lines and a 2n number of output lines. In every possible input circumstance, only one of the multiple output signals will generate the logic one. As a result, this n-to-2n decoder may also be described as a min-term generator, where each output corresponds to exactly one minterm.

Usually, the line decoders are classified into three types: 2-to-4, 3-to-8, and 4-to-16. It is also utilized to detect a specific set of bits at the input side, and it may distinguish one or more n-bit combinations using an n-to-2n configuration.

## What is Demultiplexer?

The demultiplexer is similar to the decoder but contains select lines. It is utilized to distribute a single input across numerous output lines. It collects data from a single input signal and distributes it across the specified number of output lines. It comprises data input lines, select lines, and output lines.

It has one input, n selection lines, and a maximum output of 2n. The input would be connected to one of the outputs based on the selection line values. There would be 2n possible combinations of 0's and 1's because there are 'n' selection lines. As a result, each combination may only select one output. De-Multiplexer is also known as De-Mux.

## Main Differences between Decoder and Demultiplexer

Here, you will learn the main differences between Decoder and Demultiplexer. Some main differences between Decoder and Demultiplexer are as follows:

1. A decoder is a logic circuit that changes the format of an encrypted input stream. In contrast, a demultiplexer (DEMUX) is a combination circuit that is utilized to build general-purpose logic. It routes the single input signal into one of the various output signals.
2. Demultiplexing is widely utilized in networking applications. On the other hand, decoding is utilized in data-intensive applications where data must be changed into another format.
3. Decoders are commonly classified into three categories, 2 to 4, 3 to 8, and 4 to 16 decoders. In contrast, the demultiplexer is divided into 1-4, 1-8, and 1-16 demultiplexers.
4. A decoder takes n input lines and generates 2n output lines, which is the inverse of what an encoder does. In contrast, the demultiplexer sends data from one line to 2^n possible output lines, where n chosen lines determine the output line.
5. The machine-specific language is converted into a different format using a decoder. In contrast, the demultiplexer uses a routing device to transfer data from one signal to several signals.
6. Decoders are utilized in various apps like data demultiplexing, wireless communication, memory address decoding, seven-segment displays, etc. In contrast, the demultiplexer is widely used in communication systems like networking apps and telecommunication. It gets the output signal from the multiplexer and changes it back to its original format.
7. Decoders are the inverse function of encoders. In contrast, a demultiplexer does the exact opposite of what a multiplexer does by combining multiple data streams into a single media or data stream.
8. The decoder doesn't contain select lines. On the other hand, the demultiplexer includes single lines.

Here, you will learn the head-to-head comparisons between Decoder and Demultiplexer. The main differences between Decoder and Demultiplexer are as follows:

Features Decoder Demultiplexer
Definition A decoder is a logic circuit that changes the format of an encrypted input stream. It is a combination circuit that is utilized to build general-purpose logic. It routes the single input signal into one of the various output signals.
Input and output lines It contains n input lines and 2n output lines. It contains one input and 2n output of selected lines.
Select lines It doesn't contain select lines. It contains select lines.
Inverse function Decoders are the inverse function of encoders, converting coded digital input signals into equivalently coded output signals. The demultiplexer does the exact opposite of the multiplexer by combining multiple data streams into a single media or data stream.
Implementation Decoders are utilized in various apps like data demultiplexing, wireless communication, memory address decoding, seven-segment displays, etc. The demultiplexer is widely utilized in communication systems like networking apps and telecommunication.
Types Decoders are commonly classified into three categories, 2 to 4, 3 to 8, and 4 to 16 decoders. It is divided into 1-4, 1-8, and 1-16 demultiplexers.
Boolean Expression Implementation The decoder utilizes the AND, NAND, and NOT gates. Demultiplexer utilizes the six gates consisting of AND or NOT gates.
Application It uses in the detection of bits and data encoding. It uses in the distribution of the data and switching.
Use The machine-specific language is converted into a different format using a decoder. The demultiplexer uses a routing device to transfer data from one signal to several signals.

## Conclusion

Decoders and demultiplexers are two combinational logic circuits mainly utilized in many apps to translate data or control signals. Decoders are similar to demultiplexers but with some additional features. The decoder lacks selection lines, whereas the demultiplexer contains selection lines. These two concepts are critical for understanding digital circuits. These concepts are utilized in telecommunication networks to increase signal performance and decrease delays.

Next TopicDifference between