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74ACT139SC View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
Manufacturer
74ACT139SC
Fairchild
Fairchild Semiconductor Fairchild
74ACT139SC Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Logic Symbols
IEEE/IEC
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 (A0A1)
and provides four mutually exclusive active-LOW outputs
(O0O3). 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)
Truth Table
Logic Diagram
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
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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