SDAS204A - APRIL 1982 - REVISED DECEMBER 1994
The ´ALS139 are dual 2-line to 4-line decoders/demultiplexersdesigned for use in high-performance memory-decoding or data-routingapplications requiring very short propagation delay times. Inhigh-performance memory systems, these devices can minimize theeffects of system decoding. When employed with high-speed memoriesutilizing a fast-enable circuit, the delay times of these decodersand the enable time of the memory are usually less than the typicalaccess time of the memory. Therefore, the effective system delayintroduced by the Schottky-clamped system decoder is negligible.
The ´ALS139 comprise two individual 2-line to 4-line decodersin a single package. The active-low enable (G\) input can be used asa data line in demultiplexing applications. Thesedecoders/demultiplexers feature fully buffered inputs, each of whichrepresents only one normalized load to its driving circuit. Allinputs are clamped with high-performance Schottky diodes to suppressline ringing and simplify system design.
The SN54ALS139 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ALS139 is characterized for operation from 0°C to 70°C.
View more information about generic part numbers:SN54ALS139, SN74ALS139
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