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DM74LS139MORDM74LS139N

  

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National-Semiconductor
National ->Texas Instruments
DM74LS139MORDM74LS139N Decoders/Demultiplexers

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 intro duced by the decoder is negligible.

Features
Designed specifically for high speed:
  Memory decoders
  Data transmission systems
LS138 3-to-8-line decoders incorporates 3 enable inputs to simplify cascading and/or data reception
LS139 contains two fully independent 2-to-4-line decoders/demultiplexers
Schottky clamped for high performance
Typical propagation delay (3 levels of logic)
   LS138 21 ns
   LS139 21 ns
Typical power dissipation
   LS138 32 mW
   LS139 34 mW
Alternate Military/Aerospace devices (54LS138,54LS139) are available. Contact a National Semicon ductor Sales Office/Distributor for specifications.

DM74LS139MORDM74LS139N PDF

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