STATIC DISCHARGE PROTECTIVE CIRCUIT AND INTEGRATED CIRCUIT DEVICE INCORPORATING IT

摘要

PURPOSE: To provide an electrostatic discharge protection circuit which can protect a circuit node of relatively large capacity from electrostatic discharge, and which can be made easily. CONSTITUTION: An electrostatic discharge protection circuit is constituted of a transistor 62. The transistor 62 is connected selectively between a Vcc input pin and a Vss input pin. A capacitor element 70 enables an electrostatic discharge current to escape to Vss through the transistor 62, by connecting the Vcc pin to the gate of the transistor 62 and turning on the transistor 62. A resistor element 72 connects the Vss pin to the gate of the transistor 62, and turns off the transistor 62 after discharge has been performed. The time constants of the capacitor element 70 and the resistor element 72 are selected to be larger than those of the ESD test circuit of a human body model, but smaller than the typical rise time in the circuit node of an integrated circuit device.