Datasheet SN74LS138NSRDescription
   These Schottky-clamped TTL MSI circuit 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 employed with high-speed memories utilizing a fast enable circuit,
the delay times of these decoders and the  enable time of the memory are usually less than the typical access time of the
memory. The means tha the effective system delay introduced by the Schottky-clamped system decoder is negligible.

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