4052, 744052 8-to-2 line analog multiplexer/demultiplexer with dual power supply. VEE supply may not be more positive than GND. +----------+ 1X0 |1 +--+ 16| VCC 1X2 |2 15| 2X2 1Y |3 14| 2X1 1X3 |4 13| 2Y 1X1 |5 4052 12| 2X0 /EN |6 11| 2X3 VEE |7 10| S0 GND |8 9| S1 +----------+ Datasheet: http://www.intersil.com/data/FN/FN3/FN3316/FN3316.pdf [This information is part of the GIICM]