TECHNICAL DATA
IN74ACT139
Dual 1-of-4 Decoder/Demultiplexer
High-Speed Silicon-Gate CMOS
The IN74ACT139 is identical in pinout to the LS/ALS139,
HC/HCT139. The IN74ACT139 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
IN74ACT139N Plastic
IN74ACT139D SOIC
TA = -40° to 85° 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; 0.1 μA @ 25°C
Outputs Source/Sink 24 mA
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 ]
