Author: M Abo Bakar Aslam
1x2 De-Multiplexer (DEMUX)
A 1x2 De-Multiplexer (DEMUX) is the simplest form of a de-multiplexer that takes a single input signal and forwards it to one of two output lines. The selection of output is controlled by a single selection line.
1. Truth Table - 1x2 De-Multiplexer
Suppose input is Input and selection line is S. The outputs are represented as out-0 and out-1.
Total Number of Rows = 2^(number of selection lines) = 2¹ = 2
| Input | Selection (S) | Outputs |
|---|---|---|
| Input | 0 | out-0 = Input, out-1 = 0 |
| Input | 1 | out-0 = 0, out-1 = Input |
2. Boolean Expression for Output
As there are multiple outputs, we will derive Boolean expressions for each output.
out-0 = Input S'
out-1 = Input S
3. Circuit Diagram
a. Using Basic Gates
The circuit diagram of 1x2 DEMUX can be implemented using AND and NOT gates.
b. Block Diagram Representation
De-Multiplexer is commonly represented using a block diagram.
