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74LS139 Datasheet Decoders/demultiplexers

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: 54LS138 DM54LS138 DM74LS138 54LS139 DM54LS139 DM74LS139 Decoders Demultiplexers June 1989 54LS138 DM54LS138 DM74LS138 54LS139 DM54LS139 DM74LS139 Decoders.

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 LS138 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 can be used as a data input for demultiplexing applications The LS139 comprises two separate two-line-to-four-line decoders in a single package The active-low enable input can be used as a data line in demultiplexing applications All of these decoders demultiplexers

Key Features

  • Y Y Y Y Y Y Y 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 C.

74LS139 Distributor

Similar Datasheet

Brand Logo Part Number Description Manufacturer
ON Semiconductor Logo 74LS139 LOW POWER SCHOTTKY ON Semiconductor
Hitachi Semiconductor Logo 74LS139 Dual 2-line-to-4-line Decoders/Demultiplexers Hitachi Semiconductor
Fairchild Semiconductor Logo 74LS139 Decoder/Demultiplexer Fairchild Semiconductor
Motorola Logo 74LS139 DUAL 1-OF-4 DECODER/ DEMULTIPLEXER Motorola
Texas Instruments Logo 74LS139A Dual 2-Line To 4-Line Decoders/Demultiplexer Texas Instruments

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Part Number Description
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