Electrostatic discharge protection device for pad and method...

Details Electrostatic discharge protection device for pad and method... Electrostatic discharge protection device for pad and method...

2011-03-22

2011-03-22

Fureman, Jared (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S111000, C257S355000, C257S362000

Reexamination Certificate

active

07911749

ABSTRACT:
An ESD protection device for a pad includes an adjusting circuit, a snapback element and a control circuit. The adjusting circuit includes a silicon controlled rectifier (SCR) coupled to the pad. The SCR includes a first diode. The snapback element is coupled to a first N pole of the first diode when a second diode is not used, and is coupled to a second N pole of the second diode when the second diode is used. The control circuit is coupled to the first N pole. In a normal operation mode, the control circuit provides a first voltage to the first N pole so that the first N pole collects a plurality of charges and the SCR is turned off. In an ESD mode, the control circuit does not provide the first voltage to the first N pole so that the first N pole does not collect the charges.

REFERENCES:
patent: 6545321 (2003-04-01), Morishita
patent: 6628488 (2003-09-01), Liu et al.
patent: 6919604 (2005-07-01), Lai et al.
patent: 6947267 (2005-09-01), Liu et al.
patent: 2002/0089017 (2002-07-01), Lai et al.
patent: 2005/0254189 (2005-11-01), Wu et al.
patent: 1525489 (2004-09-01), None
patent: 1716593 (2006-01-01), None

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