national semiconductor 54F/74F158A Quad 2-Input Multiplexer handbook
Datasheet
The 54F�74F158A is a high speed quad 2-input multiplexer produced by National Semiconductor Corporation. It uses the common Select and Enable inputs to select four bits of data from two data sources. The four outputs will present the selected data in the inverted form. The device can also generate any four of the 16 different functions of two variables.
