HD74AC539 Datasheet, PDF (3/10 Pages) Hitachi Semiconductor – Dual 1-of-4 Decoder with 3-State Output

Pin Names
A_0a to A_1a
A_0b to A_1b
E_a – E_b
OE_a, OE_b
P_a, P_b
O_0a to O_3a
O_0b to O_3b
Side A Address Inputs
Side B Address Inputs
Enable Inputs (Active LOW)
Output Enable Inputs (Active LOW)
Polarity Control Inputs
Side A 3-State Outputs
Side B 3-State Outputs
Truth Table
Inputs
Function
OE
E
High impedance
H
X
Disable
L
H
Active HIGH output
L
L
(P = L)
L
L
L
L
L
L
Active LOW output
L
L
(P = H)
L
L
L
L
L
L
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
Z : High Impedance
A₁
A₀
X
X
X
X
L
L
L
H
H
L
H
H
L
L
L
H
H
L
H
H
Outputs
O₀
O₁
Z
Z
O_n = P
H
L
L
H
L
L
L
L
L
H
H
L
H
H
H
H
HD74AC539
O₂
O₃
Z
Z
L
L
L
L
H
L
L
H
H
H
H
H
L
H
H
L
3