74399 8-to-4 line inverting data selector/multiplexer with output registers. +----------+ S |1 +--+ 16| VCC 1Y |2 15| 4Y 1A0 |3 14| 4A0 1A1 |4 74 13| 4A1 2A1 |5 399 12| 3A1 2A0 |6 11| 3A0 2Y |7 10| 3Y GND |8 9| CLK +----------+ [This information is part of the GIICM]