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DM74LS138M Datasheet PDF - National ->Texas Instruments

Part NameDescriptionManufacturer
DM74LS138M Decoders/Demultiplexers National-Semiconductor
National ->Texas Instruments National-Semiconductor
DM74LS138M Datasheet PDF : DM74LS138M pdf   
DM54LS139M image

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.

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 Semiconductor Sales Office/Distributor for specifications.

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