This monolithic quadruple two-input multiplexer with storage provides essentially
the equivalent functional capabilities of two separate MSI functions (SN54LS157/SN74LS157
and SN54LS175/SN74LS175) in a single 16-pin package.
When the word-select input is low, word 1 (A1, B1, C1, D1) is applied to
the flip-flops. A high input to word select will cause the selection of word
2 (A2, B2, C2, D2). The selected word is clocked to the output terminals on
the positive-going edge of the clock pulse.
Typical power dissipation is 37 milliwatts. The SN54LS399 is characterized
for operation over the full military range of -55°C to 125°C. The
SN74LS399 is characterized for operation from 0°C to 70°C.
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