Patent ID: 7072157
Filing Date: 2006-07-04
Classification: H01L

Abstract:
1. An electrostatic discharge protection circuit device comprising: a first electrostatic discharge protection circuit connected between a first external terminal supplied with a first power supply voltage at time of ordinary operation and a first ground terminal; a second electrostatic discharge protection circuit connected between a second external terminal supplied with a second power supply voltage at the time of the ordinary operation and a second ground terminal, the second electrostatic discharge protection circuit having substantially the same configuration as that of the first electrostatic discharge protection circuit; a trigger signal line which connects in common an output node of surge detection circuits of the first and second electrostatic discharge protection circuits, and transfers a surge detection output of one of the first and second electrostatic discharge protection circuits to the other electrostatic discharge protection circuit as a trigger signal; and a common discharge line connected directly to the first ground terminal, connected to the second ground terminal via a parallel circuit composed of a forward-connected parasitic diode element and a reverse-connected parasitic diode element, and used commonly by the first and second of electrostatic discharge protection circuits.