Dual 1-of-4 Decoder/Demultiplexer
HD74AC139/HD74ACT139
Dual 1-of-4 Decoder/Demultiplexer
Description
The HD74AC139/HD74ACT139 is a high-speed, dual 1-of-...
Description
HD74AC139/HD74ACT139
Dual 1-of-4 Decoder/Demultiplexer
Description
The HD74AC139/HD74ACT139 is a high-speed, dual 1-of-4 decoder/demultiplexer. The device has two independent decoders, each accepting two inputs and providing four mutually-exclusive active-Low outputs. Each decoder has an active-Low Enable input which can be used as a data input for a 4-output demultiplexer. Each half of the HD74AC139/HD74ACT139 can be used as a function generator providing all four minterms of two variables.
Features
Multifunction Capability Two Completely Independent 1-of-4 Decoders Active Low Mutually Exclusive Outputs Outputs Source/Sink 24 mA HD74ACT139 has TTL-Compatible Inputs
HD74AC139/HD74ACT139
Pin Arrangement
Ea 1 A0a 2 A1a 3 O0a 4 O1a 5 O2a 6 O3a 7 GND 8 (Top view)
16 VCC 15 Eb 14 A0b 13 A1b 12 O0b 11 O1b 10 O2b 9 O3b
Logic Symbol
E
A0
A1
E
A0
A1
DECODER a
DECODER b
O0 O1 O2 O3
O0 O1 O2 O3
Pin Names
A0, A1 E O0 to O 3 Address Inputs Enable Inputs Outputs
2
HD74AC139/HD74ACT139
Logic Diagram
Ea 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 (A 0 to A1) and provides four mutually exclusive active-Low outputs ( O0 t...
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