Dual 2-line to 4-line demultiplexer and decoder

The SN74AHC139 are dual 2-line

to 4-line decoders/demultiplexers designed for 2V to 5.5V VCC operation. These

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 used

with high-speed memories utilizing a fast enable circuit, the delay times of these decoders

and the enable time of the memory usually are less than the typical access time of the

memory. This means that the effective system delay introduced by the decoders is

negligible.