A Decoder Can Be Used as a Demultiplexer by

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Choose the right answer to the question, a decoder can be used as a demultiplexer by, from the following options along with the detailed explanation.

1. tying all enable pins LOW
2. tying all data-select lines LOW
3. tying all data-select lines HIGH
4. using the input lines for data selection and an enable line for data input

Answer – D. using the input lines for data selection and an enable line for data input.

The decoder can be used as a demultiplexer by using the input lines for data selection and an enable line for data input.

Solution

The detailed solution to the question, a decoder, can be used as a demultiplexer

A combinational circuit known as a decoder transforms binary data from n input lines to 2n distinct output lines. A decoder may also include an Enable input line and the Input lines.

A decoder as Demultiplexer:

As a demultiplexer, a Decoder with Enable input might be used. A circuit known as a demultiplexer takes data from a single line and sends it to one of 2n different output lines.

N selection lines and one input line are fed into a 2n demultiplexer. One is chosen using these selection lines instead of a potential 2n output line. We employ an n: 2n decoder with Enable input to create a 2n demultiplexer. The n selection lines of the Demultiplexer are the n input lines that the decoder receives, and the Demultiplexer’s single input line is the decoder enable input.

Using a 2:4 Decoder with Enable input to create a 1:4 demultiplexer. Let EN serve as the Demultiplexer’s input line and A and B as the selection lines.

When A and B are used as selection inputs, and EN is used as a data input line, the decoder depicted below performs as a 2:4 demultiplexer. Although the single input variable E has a path to all four outputs, the binary combination of the two selection lines A and B specifies that the input data is directed to only one of the output lines. The truth table of the circuit can be used to confirm this.

Hence, Option (D) is the correct answer.

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