4051, 744051 8-to-1 line analog multiplexer/demultiplexer with dual power supply. VEE supply may not be more positive than GND. +----------+ X4 |1 +--+ 16| VCC X6 |2 15| X2 Y |3 14| X1 X7 |4 13| X0 X5 |5 4051 12| X3 /EN |6 11| S0 VEE |7 10| S1 GND |8 9| S2 +----------+ [This information is part of the GIICM]