Distributed VCC/VSS ESD clamp structure

Details Distributed VCC/VSS ESD clamp structure Distributed VCC/VSS ESD clamp structure

1993-02-19

1994-11-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 91, H02H 320, H02H 900

Patent

active

053611853

ABSTRACT:
A distributed VCC/VSS clamp structure (10) for preventing inadvertent damage to semiconductor integrated circuits caused by an electrostatic discharging event occurring between any two external pins thereof includes a clamp transistor (Q4) which is disposed locally to every ESD protection circuitry associated with each input and output pin of a semiconductor integrated circuit. The clamp transistor is activated so as to provide a secondary discharging path when the direct clamp discharging paths of the ESD protection circuitry are not forming a complete path.

REFERENCES:
patent: 4730129 (1988-03-01), Kunitoki et al.
patent: 5237395 (1993-08-01), Lee
patent: 5255146 (1993-10-01), Miller

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