High-voltage tolerant power-rail ESD clamp circuit for...

Details High-voltage tolerant power-rail ESD clamp circuit for... High-voltage tolerant power-rail ESD clamp circuit for...

2008-07-08

2008-07-08

Tran, Anh Q (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000, C326S081000, C361S056000, C361S091100

Reexamination Certificate

active

11366143

ABSTRACT:
A circuit for electrostatic discharge (ESD) protection includes a resistor a capacitor connected in series with the resistor, a first transistor including a gate, the gate being connected to a first power supply providing a first voltage to the gate via the resistor and a first terminal connected to the first power supply, a second transistor including a gate, the gate being connected to a second power supply, the second power supply providing a second voltage smaller than the first voltage, the second transistor having a first terminal connected to a second terminal of the first transistor, and a third transistor including a gate, the gate being connected to the second power supply, a first terminal of the third transistor being connected to a second terminal of the second transistor, and a second terminal being connected to a reference voltage different from the first voltage and the second voltage.

REFERENCES:
patent: 7221551 (2007-05-01), Chen
patent: 2002/0159208 (2002-10-01), Ker et al.
patent: 2004/0218322 (2004-11-01), Chen et al.
patent: 2005/0200396 (2005-09-01), Hsu et al.

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