Electrostatic protection circuit

Details Electrostatic protection circuit Electrostatic protection circuit

2008-07-01

2008-07-01

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S111000

Reexamination Certificate

active

07394631

ABSTRACT:
An electrostatic protection circuit including: a first power supply terminal110; a second power supply terminal112; an input-output terminal111for an external connection; a P-type MOSFET for a buffer108for pulling up input and output to a high-level potential; an N-type MOSFET for the buffer107for pulling down the input and output to a low-level potential; a rectifying element109connected between the first and second power supply terminals; a detector101for comparing the potential of the input-output terminal111to the potential of the first power supply terminal110to detect whether or not an electrostatic surge is flowing in; and controllers105and106, wherein the controllers105and106control a gate potential of the N-type MOSFET107for the buffer when the detector101detects inflow of the electrostatic surge and turn off the N-type MOSFET107for the buffer. Discharge of the electrostatic surge is performed through a parasitic bipolar junction transistor121formed on the N-type MOSFET107.

REFERENCES:
patent: 5239440 (1993-08-01), Merrill
patent: 6400540 (2002-06-01), Chang
patent: 6765772 (2004-07-01), Lee et al.
patent: 2004/0105201 (2004-06-01), Wu et al.

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