Guardringed SCR ESD protection

Details Guardringed SCR ESD protection Guardringed SCR ESD protection

2008-09-23

2008-09-23

Hu, Shouxiang (Department: 2811)

Active solid-state devices (e.g., transistors, solid-state diode

Regenerative type switching device

Device protection

C257S107000, C257S110000, C257S362000, C257S363000

Reexamination Certificate

active

11177755

ABSTRACT:
Methods and circuits are disclosed for protecting an electronic circuit from ESD damage using an SCR ESD cell. An SCR circuit is coupled to a terminal of an associated microelectronic circuit for which ESD protection is desired. The SCR used in the ESD cell of the invention is provided with a full guardring for shielding the SCR from triggering by fast transients. A resistor is provided at the guardring for use in triggering the SCR at the onset of an ESD event. Exemplary preferred embodiments of the invention are disclosed with silicide-block resistors within the range of about 2-1000 Ohms or less.

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patent: 2004/0065895 (2004-04-01), Lai et al.
patent: 2005/0133869 (2005-06-01), Ker et al.

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