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.
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