What is a Demultiplexer?

A demultiplexer, often abbreviated as a DEMUX, is a combinational logic circuit designed to receive a single input signal and route it to one of several output lines. It functions as the exact inverse of a Multiplexer (MUX). While a MUX acts as a multi-input, single-output switch, a DEMUX acts as a single-input, multi-output switch.

How the DEMUX Calculation Works

The relationship between the number of select lines and the number of output lines is exponential. In digital electronics, the number of output lines (Y) is determined by the number of select lines (n) using the formula: Y = 2ⁿ.

For example, if you have 3 select lines, the demultiplexer will have 2³ = 8 output lines. This is commonly referred to as a 1-to-8 demultiplexer.

How to Use the Demultiplexer Calculator

Using this tool is straightforward. Simply follow these steps:

• Enter the total number of Select Lines into the input field.
• Click the "Calculate Outputs" button.
• The tool will instantly display the total number of output lines and provide a step-by-step breakdown of the logic used.

Applications of Demultiplexers

Demultiplexers are essential components in various digital systems, including:

• Communication Systems: To convert serial data back into parallel data at the receiving end.
• Memory Chips: Selecting specific memory locations based on address inputs.
• Arithmetic Logic Units (ALUs): Routing the output of an ALU to different registers.
• Data Distribution: Sending data from one source to multiple destinations based on timing or logic.

Frequently Asked Questions

Q: Can a DEMUX have 3 outputs?
A: No, standard demultiplexers always have outputs in powers of 2 (2, 4, 8, 16, etc.) based on binary selection logic.

Q: What is the input signal in a DEMUX?
A: Typically, there is one data input line and 'n' selection lines that decide which output line the data is sent to.