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74ACT139 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name74ACT139 Hitachi
Hitachi -> Renesas Electronics Hitachi
DescriptionDual 1-of-4 Decoder/Demultiplexer
74ACT139 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Logic Diagram
Ea
HD74AC139/HD74ACT139
A0a A1a
Eb
A0b A1b
O0a O1a O2a O3a O0b O1b O2b O3b
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Functional Description
The HD74AC139/HD74ACT139 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 to A1) and provides four
mutually exclusive active-Low outputs (O0 to 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 HD74AC139/HD74ACT139 generates all four minterms of two variables.
These four minterms are useful in some applications, replacing multiple gate functions as shown in Figure
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
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
3
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