STATIC DISCHARGE PROTECTIVE CIRCUIT FOR INTEGRATED CIRCUIT

摘要

PURPOSE: To provide a static discharge protective circuit used for a field effect transistor circuit having a feature section of 1 μm. ;CONSTITUTION: A protective circuit 30 is provided with a trigger circuit 24 and a clamp circuit 26. The circuit 24 clamps the node of a protected integrated circuit 10 to both upper and lower potentials in response to static discharge by turning on the clamp circuit 26. When the node is clamped, the static discharge can be dispersed to one potential source depending upon the polarity of the discharge. It is preferable to constitute the trigger circuit 24 of a resistance-capacitor network which generates a required control signal whenever electric power is supplied to the protected circuit 10 and the clamp circuit 26 of a pair of transistors which connect input pins to both high and low potential sources. Typically, one protective circuit is coupled to each input-output pin of the protected integrated circuit 10.;COPYRIGHT: (C)1995,JPO