74157 4-of-8 noninverting decoder/demultiplexer. +----------+ S |1 +--+ 16| VCC 1A0 |2 15| /EN 1A1 |3 14| 4A0 1Y |4 74 13| 4A1 2A0 |5 157 12| 4Y 2A1 |6 11| 3A0 2Y |7 10| 3A1 GND |8 9| 3Y +----------+ [This information is part of the GIICM]