ULN2803 8-bit 50V 500mA TTL-input NPN darlington driver. The drivers need no power supply; the VDD pin is the common cathode of the eight integrated protection diodes. +----------+ +-------+ A0 |1 +--+ 18| /Y0 | A |/Y | A1 |2 17| /Y1 |---+---| A2 |3 16| /Y2 | 0 | Z | A3 |4 ULN 15| /Y3 | 1 | 0 | A4 |5 2803 14| /Y4 +-------+ A5 |6 13| /Y5 A6 |7 12| /Y6 A7 |8 11| /Y7 GND |9 10| VDD +----------+ [This information is part of the GIICM]