Decoders/Demultiplexers

Decoder: single data input, n control inputs, 2 outputs

control inputs (called select S) represent Binary index of output to which

the input is connected

data input usually called "enable" (G)

n

1:2 Decoder:

O0 = G • S; O1 = G • S

2:4 Decoder:

O0 = G • S0 • S1

O1 = G • S0 • S1

O2 = G • S0 • S1

O3 = G • S0 • S1

3:8 Decoder:

O0 = G • S0 • S1 • S2

O1 = G • S0 • S1 • S2

O2 = G • S0 • S1 • S2

O3 = G • S0 • S1 • S2

O4 = G • S0 • S1 • S2

O5 = G • S0 • S1 • S2

O6 = G • S0 • S1 • S2

O7 = G • S0 • S1 • S2

Previous slide

Next slide

Back to first slide

View graphic version