TECHNICAL DATA
IN74HCT139A
Dual 1-of-4 Decoder/Demultiplexer
High-Performance Silicon-Gate CMOS
The IN74HCT139A is identical in pinout to the LS/ALS139. The
IN74HCT139A may be used as a level converter for interfacing TTL or
NMOS outputs to High Speed CMOS inputs.
This device consists of two independent 1-of-4 decoders, each of
which decodes a two-bit Address to one-of-four active-low outputs.
Active-low Selects are provided to facilitate the demultiplexing and
cascading functions. The demultiplexing function is accomplished by
using the Address inputs to select the desired device output, and utilizing
the Select as a data input.
•
TTL/NMOS Compatible Input Levels
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 4.5 to 5.5 V
•
Low Input Current: 1.0
µA
ORDERING INFORMATION
IN74HCT139AN Plastic
IN74HCT139AD SOIC
T
A
= -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Select
PIN 16 =V
CC
PIN 8 = GND
H
L
L
L
L
A1
X
L
L
H
H
A0
X
L
H
L
H
Y0
H
L
H
H
H
Outputs
Y1
H
H
L
H
H
Y2
H
H
H
L
H
Y3
H
H
H
H
L
X = don’t care
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
