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DM74S139

Fairchild Semiconductor
Part Number DM74S139
Manufacturer Fairchild Semiconductor
Description Decoder/Demultiplexer
Published Dec 12, 2014
Detailed Description DM74S138 • DM74S139 Decoder/Demultiplexer August 1986 Revised April 2000 DM74S138 • DM74S139 Decoder/Demultiplexer Ge...
Datasheet PDF File DM74S139 PDF File

DM74S139
DM74S139

Overview
DM74S138 • DM74S139 Decoder/Demultiplexer August 1986 Revised April 2000 DM74S138 • DM74S139 Decoder/Demultiplexer General Description These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications, requiring very short propagation delay times.
In high-performance memory systems these decoders can be used to minimize the effects of system decoding.
When used with high-speed memories, the delay times of these decoders are usually less than the typical access time of the memory.
This means that the effective system delay introduced by the decoder is negligible.
The DM74S138 decodes one-of-eight lines, based upon the conditions at the three binary select inputs and the three enable inputs.
Two active-LOW and one active-HIGH enable inputs reduce the need for external gates or inverters when expanding.
A 24-line decoder can be implemented with no external inverters, and a 32-line decoder requires only one inverter.
An enable input...


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