IN74ACT139
D
UAL
1-
OF
-4 D
ECODER
/D
EMULTIPLEXER
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.
•
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
•
•
•
•
ORDERING INFORMATION
IN74ACT139N Plastic
IN74ACT139D SOIC
T
A
= -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Select A1
A0
Y Y1 Y2
0
H
X
X
H
H
H
L
L
L
L
H
H
L
L
H
H
L
H
L
H
L
H
H
L
L
H
H
H
H
H
X = don’t care
Y3
H
H
H
H
L
1
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