ESD protection circuit with a low snapback voltage that is...

Details ESD protection circuit with a low snapback voltage that is... ESD protection circuit with a low snapback voltage that is...

2008-05-27

2008-05-27

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S056000, C361S111000

Reexamination Certificate

active

07379283

ABSTRACT:
A three-terminal snapback device is utilized with a control circuit to provide a low snapback voltage that is protected from non-ESD voltage spikes and ripples. In response to a fast edge, the control circuit lowers the snapback voltage, unless a status signal indicates that normal operating voltages are present, and raises the snapback voltage a predefined time later. If the fast edge represents an ESD pulse, SCR operation is initiated at the lowered snapback voltage. If the fast edge represents a power on sequence, the maximum voltage is less than the momentarily lowered snapback voltage and therefore insufficient to initiate SCR operation. Further, once normal operating voltages are present, the control circuit continuously maintains the raised snapback voltage so that a non-ESD voltage spike or ripple can not improperly turn on the snapback device.

REFERENCES:
patent: 5239440 (1993-08-01), Merrill
patent: 5835328 (1998-11-01), Maloney et al.
patent: 7027277 (2006-04-01), Vashchenko et al.
patent: 7141831 (2006-11-01), Vashchenko et al.
patent: 2004/0109270 (2004-06-01), Stockinger et al.
patent: 2005/0275984 (2005-12-01), Liu et al.
U.S. Appl. No. 11/724,622, filed Mar. 15, 2007, Vladislav Vashchenko et al.

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