HD74HC139 Datasheet, PDF (1/9 Pages) Hitachi Semiconductor – Dual 2-to-4-line Decoders/Demultiplexers

HD74HC139
Dual 2-to-4-line Decoders/Demultiplexers
Description
The HD74HC139 contains two independent two-to-four-line decoders each with a single active low enable
input (1G or 2G). Data on the slect inputs (1A and 1B or 2A and 2B) cause one of the four normally high
outputs to go low.
Features
• High Speed Operation: t_pd (A, B to Y, 4 levels) = 14 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: V_CC = 2 V to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Enable
Select
G
B
A
H
X
X
L
L
L
L
L
H
L
H
L
L
H
H
Outputs
Y₀
Y₁
Y₂
Y₃
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L