Semiconductor integrated circuit with surge-protected output MIS

Details Semiconductor integrated circuit with surge-protected output MIS Semiconductor integrated circuit with surge-protected output MIS

1995-08-14

1997-03-04

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 18, 361111, 361 56, H02H 904

Patent

active

056085940

ABSTRACT:
A semiconductor integrated circuit includes an internal circuit, and ground and power supply lines for activating the internal circuit. An output MISFET is activated by peripheral circuit ground and power supply lines. For protection of the internal circuit from the effects of ground or power supply line noise, an impedance electrically separates the power supply lines for the internal and peripheral circuits and/or the ground lines for the peripheral and internal circuits. A surge protection circuit is provided between the gate of the output MISFET, and either or both of the ground and power supply lines for the peripheral circuitry. In response to a breakdown of the output MISFET due to a surge of static electricity, the surge protection circuit reduces the voltage difference between the gate of the output MISFET and either or both of the ground and power supply lines for peripheral circuitry, thus reducing the voltage applied across the gate insulation film of the output MISFET and keeping the gate insulation film from being damaged.

REFERENCES:
patent: 4066918 (1978-01-01), Heuner et al.
patent: 4855863 (1989-08-01), Yoshitake

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