Unlatch feature for latching ESD protection circuit

Details Unlatch feature for latching ESD protection circuit Unlatch feature for latching ESD protection circuit

2011-04-19

2011-04-19

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

Reexamination Certificate

active

07929263

ABSTRACT:
The present invention is a latching electrostatic discharge (ESD) protection circuit that enables and latches an ESD clamping circuit upon an ESD event, and disables and un-latches the ESD clamping circuit upon either a drop in the DC supply voltage below a defined threshold or a time-out. The time-out protects against effects of inadvertent latching or any anomaly in which the latching ESD clamping circuit does not un-latch. An ESD event is a voltage spike between the DC supply voltage and ground wherein the ESD clamping circuit applies a low impedance between the DC supply voltage and ground to dissipate the energy contained in the voltage spike, thereby protecting adjacent circuitry.

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Smith, Jeremy C., “A MOSFET Power Supply Clamp with Feedback Enhanced Triggering for ESD Protection in Advanced CMOS Technologies,” Proc. EOS/ESD 2003, pp. 8-16, ESD Association.

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