Electrostatic discharge (ESD) clamp using output driver

Details Electrostatic discharge (ESD) clamp using output driver Electrostatic discharge (ESD) clamp using output driver

2008-04-22

2008-04-22

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S111000

Reexamination Certificate

active

10431942

ABSTRACT:
Electrostatic discharge (ESD) clamp using output driver. An electrostatic discharge (ESD) protection device for an output driver having a p-channel transistor and n-transistor pair connected between a power supply terminal and ground for driving an input/output pad therefrom. An ESD event detector is provided for detecting an ESD event on the pad. A drive circuit drives the n-channel and p-channel drive transistors in response to receiving a logic control signal to either drive the pad from the supply terminal or to sink the pad to ground. ESD protection logic circuitry is provided to cause both the p-channel and n-channel transistors to turn on when the ESD event detector detects an ESD event, the ESD protection circuitry disposed forward of the drive circuit such that the ESD protection logic circuitry operates independent of the state of the drive circuit.

REFERENCES:
patent: 5910873 (1999-06-01), Boluna et al.
patent: 6043970 (2000-03-01), Song et al.
patent: 6249410 (2001-06-01), Ker et al.
patent: 6369994 (2002-04-01), Voldman
patent: 6545520 (2003-04-01), Maloney et al.
patent: 6653878 (2003-11-01), Nolan

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