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DM74LS138 • DM74LS139 Decoder/Demultiplexer
August 1986 Revised March 2000
DM74LS138 • DM74LS139 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 DM74LS138 decodes one-of-eight lines, based upon the conditions at the three binary select inputs and the three enable inputs.
DM74LS139 Datasheet
