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SN74LS139 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. SN74LS139
Description  LOW POWER SCHOTTKY
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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SN74LS139
http://onsemi.com
3
LOGIC DIAGRAM
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
A0a A1a
Ea
A0b
O3a
O0b
O1b
O2b
O3b
O1a
O2a
Eb
A1b
O0a
12
11
6
7
4
5
10
9
1
2
3
15
14
13
FUNCTIONAL DESCRIPTION
The LS139 is a high speed dual 1-of-4 decoder/
demultiplexer fabricated with the Schottky barrier diode
process. The device has two independent decoders, each of
which accept two binary weighted inputs (A0, A1) and
provide four mutually exclusive active LOW outputs
(O0 –O3). Each decoder has an active LOW Enable (E).
When E is HIGH all outputs are forced HIGH. The enable
can be used as the data input for a 4-output demultiplexer
application.
Each half of the LS139 generates all four minterms of two
variables. These four minterms are useful in some
applications, replacing multiple gate functions as shown in
Fig. a, and thereby reducing the number of packages
required in a logic network.
TRUTH TABLE
INPUTS
OUTPUTS
E
A0
A1
O0
O1
O2
O3
H
X
X
H
H
H
H
L
LL
L
HHH
L
HL
H
LH
H
L
LH
H
HLH
L
HH
H
HH
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Figure a
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3




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