HD74AC182 Datasheet, PDF (4/11 Pages) Hitachi Semiconductor – Carry Lookhead Generator

HD74AC182/HD74ACT182
Truth Table
Inputs
Outputs
C_n G₀
P₀
G₁
P₁
G₂
P₂
G₃
P₃
C_{n + x} C_{n + y}
C_{n + z}
G
P
XH
H
L
LH
X
L
XL
X
H
HX
L
H
XX
X
H
H
L
XH
H
H
X
L
LH
X
H
X
L
XX
X
L
X
H
XL
X
X
L
H
HX
L
X
L
H
XX
X
X
X
H
H
L
XX
X
H
H
H
X
L
XH
H
H
X
H
X
L
LH
X
H
X
H
X
L
XX
X
X
X
L
X
H
XX
X
L
X
X
L
H
XL
X
X
L
X
L
H
HX
L
X
L
X
L
H
X
X
X
X
X
H
H
H
X
X
X
H
H
H
X
H
X
H
H
H
X
H
X
H
H
H
X
H
X
H
X
H
X
X
X
X
X
L
X
L
X
X
X
L
X
X
L
L
X
L
X
X
L
X
L
L
L
X
L
X
L
X
L
L
H
X
X
X
H
X
H
X
X
H
X
X
H
X
H
X
X
X
H
H
L
L
L
L
L
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
4