A demultiplexer (DMUX) is a device which essentially performs the opposite operation to the MUX. That is, it functions as an electronic switch (/data distributor) to route an incoming data signal to one of several outputs. Figure 2-15 shows the logic symbol for the 1-line-to-4-line demultiplexer circuit and Table 2-15 list the associated Truth table. The corresponding logic circuit implementation is then shown in Figure 2-16.
Figure 2-15 Logic symbol for 1-line-to-4-line demultiplexer
Data |
Address |
Outputs |
||||
S1 |
S0 |
Y0 |
Y1 |
Y2 |
Y3 |
|
D |
0 |
0 |
D |
0 |
0 |
0 |
D |
0 |
1 |
0 |
D |
0 |
0 |
D |
1 |
0 |
0 |
0 |
D |
0 |
D |
1 |
1 |
0 |
0 |
0 |
D |
Table 2 -15 Demultiplexer Function Tables
Figure 2-16 1-line-to-4-line Demultiplexer
Copyright © Adrian Als , 1999
This page was last modified: Wednesday, April 12, 2000