HD74HC155 Datasheet, PDF (2/9 Pages) Hitachi Semiconductor – Dual 2-to-4-line Decoders/Demultiplexers

HD74HC155
Inputs
Select
B
A
X
X
L
L
L
H
H
L
H
H
X
X
Strobe
Data
Outputs
2G
2C
H
X
2Y₀
2Y₁
2Y₂
2Y₃
H
H
H
H
L
L
L
H
H
H
L
L
H
L
H
H
L
L
H
H
L
H
L
L
H
H
H
L
X
H
H
H
H
H
3-line-to-8-line Decoder/1-line-to-8-line Demultiplexer
Inputs
Outputs
Select
Strobe Data 0
1
2
3
4
5
6
7
C
B
A
G
X
X
XH
2Y₀
2Y₁
2Y₂
2Y₃
1Y₀
1Y₁
1Y₂
1Y₃
H
H
H
H
H
H
H
H
L
L
LL
L
H
H
H
H
H
H
H
L
L
HL
H
L
H
H
H
H
H
H
L
HLL
H
H
L
H
H
H
H
H
L
H HL
H
H
H
L
H
H
H
H
H
L
L
L
H
H
H
H
L
H
H
H
H
L
HL
H
H
H
H
H
L
H
H
H
H
L
L
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
L
Notes: 1. C: inputs 1C and 2C connected together
2. G: inputs 1G and 2G connected together
3. X: irrelevant
2