Multiplexers and Demultiplexers

1
Multiplexers and Demultiplexers
2
Design of a 2/1 Mux

• 2/1 mux Block Diagram

• Truth Table

D0
O
D1
S
3
Design of 2/1 Mux Continued

• K-Map

SA
11
01
10
00
B
0
1
1
1
1
1
O SA SB
4
4/1 Mux

• Circuit

5
Uses of Multiplexers

• Used in data communications for several computers
  to communicate over 1 line
• Used in radio to select one channel from many
• Used to route data within a computer
• Used for function generation

6
Function Generation using Multiplexers

• Given the following truth table use an 8/1 Mux to
  generate F

• Block Diagram

0
0
1
0
0
F
1
1
1
S2
S0
S1
A
B
C
7
Function Generation Continued

• Generate the previous F using a 4 to 1 Mux

0
C
F
C
1
S1
S0
A
B
8
1 to 2 Demultiplexer

• Truth Table

• Circuit