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74AC139 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. 74AC139
Description  Dual 1-of-4 Decoder / Demultiplexer
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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74AC139 Datasheet(HTML) 3 Page - ON Semiconductor

 
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74AC139, 74ACT139
www.onsemi.com
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Logic Symbol/s
IEEE/IEC
TRUTH TABLE/S
Inputs
Outputs
E
A0
A1
O0
O1
O2
O3
H
X
X
H
H
H
H
L
L
L
L
H
H
H
L
H
L
H
L
H
H
L
L
H
H
H
L
H
L
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The AC/ACT139 is a high−speed dual 1−of−4 decoder/
demultiplexer. The device has two independent decoders,
each of which accepts two binary weighted inputs (A0–A1)
and provides 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 AC/ACT139 generates all four
minterms of two variables. These four minterms are useful
in some applications, replacing multiple gate functions as
shown in Figure 1, and thereby reducing the number of
packages required in a logic network.
Figure 1. Gate Functions (Each Half)
Logic Diagram/s
Please note that this diagram is provided only for the
understanding of logic operations and should not be used to
estimate propagation delays.


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