Demultiplexers

  1. Introduction
  2. Demultiplexers in multiple variations.
    1. 1 : 2 demultiplexer
      1. Block diagram
      2. Truth table
    2. 1 : 4 demultiplexer
    3. 1 : 8 demultiplexer
    4. 1 : 16 demultiplexer

Introduction

A demultiplexer performs the reverse operation of a multiplexer i.e. it receives one input and distributes it over several outputs. It has only one input, n outputs, m select input. At a time only one output line is selected by the select lines and the input is transmitted to the selected output line. A de-multiplexer is equivalent to a single pole multiple way switch as shown in fig.

Demultiplexers in multiple variations.

1 : 2 demultiplexer

Block diagram

Truth table

1 : 4 demultiplexer

1 : 8 demultiplexer

1 : 16 demultiplexer

A 1 : 16 demultiplexer can be implemented using two 1 : 8 demultiplexers.