Circuit for electrostatic discharge protection

Details Circuit for electrostatic discharge protection Circuit for electrostatic discharge protection

1998-08-17

1999-08-31

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

H02H 900

Patent

active

059461772

ABSTRACT:
A circuit (100) ensures electrostatic discharge (ESD) protection during an ESD event. The ESD circuit (100) has a current shunting device (135), a RC trigger circuit (125) and a RC delay circuit (130). The shunting device (135) is connected between two IC power supply rails, and provides the primary current path for a positive ESD event referenced from one power supply rail (V.sub.DD 105) to the other (V.sub.ss 110). The trigger circuit (125) initially activates the shunting device into a low resistance conductive state in response to an ESD event. The RC delay circuit (130) serves to maintain the shunting device in the conductive state, initially produced by the trigger circuit (125), for the remaining duration of the ESD event. A large capacitor required to achieve the delay time in this RC circuit may be eliminated by utilizing the gate-to-body capacitance in the existing shunting device (135).

REFERENCES:
patent: 5239440 (1993-08-01), Merrill
patent: 5287241 (1994-02-01), Puar
patent: 5440162 (1995-08-01), Worley et al.
patent: 5559659 (1996-09-01), Strauss
patent: 5654862 (1997-08-01), Worley et al.
patent: 5745323 (1998-04-01), English et al.

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