Patent ID: 6072677
Filing Date: 2000-06-06
Classification: H01L

Abstract:
An electrostatic discharge protective circuit formed by the use of a silicon controlled rectifier, electrically coupled to an input port and an internal circuit for discharging electronic charges on the input port to ground, the electrostatic discharge protective circuit comprising:a PNP bipolar junction transistor having a first emitter, a first base and a first collector, the input port and internal circuit being electrically coupled to said protective circuit only through said first emitter;a NPN bipolar junction transistor having a second emitter electrically coupled to the ground, a second base and a second collector electrically coupled to the first base;a first resistor, of which a first terminal is electrically coupled to the first collector and the second base, and a second terminal is electrically coupled to the ground;an MOS transistor having a source electrically coupled to the ground, a drain electrically coupled to the first base and the second collector, and a gate; anda second resistor, of which a first terminal is electrically coupled to the gate, and a second terminal is electrically coupled to the ground.