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.
ORDERING INFORMATION
IN74HCT139AN Plastic
IN74HCT139AD SOIC
TA = -55° to 125° C for all packages
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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
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Outputs
Select
H
A1
X
L
A0 Y0 Y1
Y2
H
H
H
L
Y3
H
H
H
H
L
PIN 16 =VCC
PIN 8 = GND
X
L
H
L
H
H
L
L
L
L
H
L
H
H
H
L
H
H
H
H
L
H
H
X = don’t care
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
