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54AC139F Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 54AC139F
Description  Dual 1-of-4 Decoder/Demultiplexer
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54AC139F Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagrams
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 (A
0–A1)
and provides four mutually exclusive active-LOW outputs
(O
0–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 , and thereby reducing the number of packages re-
quired in a logic network.
Truth Table
Inputs
Outputs
E
A
0
A
1
O
0
O
1
O
2
O
3
H
X
X
HHHH
L
LLL
H
H
H
L
HLHLH
H
L
L
H
H
HLH
L
HHHHH
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Pin Assignment
for DIP and Flatpak
DS100269-3
Pin Assignment
for LCC
DS100269-4
DS100269-6
FIGURE 1. Gate Functions (Each Half)
www.national.com
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