ESD protection structure

Details ESD protection structure ESD protection structure

2007-08-09

2010-12-28

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

Reexamination Certificate

active

07859804

ABSTRACT:
This relates to a sense circuit to detect an ESD event and turn on an SCR to discharge the ESD event. In a preferred embodiment, the circuit comprises a resistor in the signal path to/from an I/O buffer, a sense circuit in parallel with the resistor, an SCR connected between ground and a node between the resistor and the I/O pad, and an I/O buffer connected between ground and the other end of the resistor. When the sense circuit detects a significant voltage drop across the resistor, it injects current into the SCR, thereby turning on the SCR and discharging the ESD event.

REFERENCES:
patent: 2005/0286188 (2005-12-01), Camp et al.
patent: 2007/0236842 (2007-10-01), Choi
patent: 2008/0123229 (2008-05-01), Choi

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