The 74F251APC is a high-speed 8-input digital multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. It can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided.
On-chip select logic decoding
Inverting and non-inverting TRI-STATE outputs
16 pin DIP. Manufactured by National.