This document discusses demultiplexers, including what they are, their applications, and examples of 1-to-2, 1-to-4, and 1-to-8 line demultiplexers. A demultiplexer takes a single input line and routes it to one of several output lines based on the value of control inputs. It finds applications in communication systems and computing where it is used to connect a single source to multiple destinations. Truth tables and logic expressions are provided to illustrate the functionality of a 1-to-8 line demultiplexer.

2. Group Members :
 Md. Selim Reza 183-15-12020
 Md. Asif Iqbal Niloy 183-15-11895
 Md. Dawan Sakibur Rahman 183-15-1
 Md. Ashiqur Rahman Riaz 183-15-11943
 Md. Oliur Rahman 183-15-11245
 Md. Nazmus Sakib 183-15-11860
 Sheikh Sazzad 181-15-11045

3. Contents :
 What is Demultiplexer.
 Demultiplexer Types.
 Applications of De-Multiplexer
 1-to-2 Line Demultiplexer.
 1-to-4 Line Demultiplexer.
 1-to-8 Line Demultiplexer.
 1-to-8 Line Demultiplexer Truth Table.

4. What is Demultiplerxer ?
 A demultiplexer (or demux) is a device that takes a single input line and routes it to one of several
digital output linesA demultiplexer is also called a data distributor.
 A demultiplexer has N control inputs 1 data input 2N outputs.
 A demultiplexer routes (or connects) the data input to the selected output. The value of the control
inputs determines the output that is selected.
 The reverse of the digital demultiplexer is the digital multiplexer.

5. Applications of De-Multiplexer :
 De-multiplexer is used to connect a single source to multiple destinations. The main
application area of de-multiplexer is communication system where multiplexer are
used.
• Communication System
• ALU (Arithmetic Logic Unit)
• Serial to parallel converter

6. DEMUX Types :
 1-to-2 (1 select line)
 1-to-4 (2 select lines)
 1-to-8 (3 select lines)
 1-to-16 (4 select lines)
 1-to-32 (5 select lines)

8. Functional Diagram Of a Demultiplexer :

9. 1- to -2 line demultiplexer :

10. 1- to- 4 line demultiplexer :

11. 1 : 8 Demultiplexer :
Truth Table
This DeMux can direct one data line onto 8 separate output channels and these 8 channels are controlled
by 3 control signals.
Truth TableFunctional Diagram

12. 1 to 8 DeMux Schematic Diagram And logical Expressions:
Y0 = S̅ 2 S̅ 1 S̅ 0 D
Y1 = S̅ 2 S̅ 1 S0 D
Y2 = S̅ 2 S1 S̅ 0 D
Y3 = S̅ 2 S1 S0 D
Y4 = S2 S̅ 1 S̅ 0 D
Y5 = S2 S̅ 1 S0 D
Y6 = S2 S1 S̅ 0 D
Y7 = S2 S1 S0 D
Logical ExpressionsLogic Diagram