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Documents SN54HC138, SN74HC138
SCLS107F – DECEMBER 1982 – REVISED SEPTEMBER 2016 SNx4HC138 3-Line To 8-Line Decoders/Demultiplexers
1 Features 3 Description The SNx4HC138 devices 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 using 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. This means that the effective system delay
introduced by the decoders is negligible. 1 Targeted Specifically for High-Speed Memory
Decoders and Data-Transmission Systems
Wide Operating Voltage Range (2 V to 6 V)
Outputs Can Drive Up To 10 LSTTL Loads
Low Power Consumption, 80-ВµA Maximum ICC
Typical tpd = 15 ns …
