Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1996-05-20
1998-03-31
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 56, 361118, H02H 322
Patent
active
057345414
ABSTRACT:
An electrostatic discharge (ESD) protection structure for protection of a circuit to which an operation voltage is to be applied, comprising a silicon controlled rectifier (SCR) connected between ground and a pad of the circuit to be protected, the SCR including a resistor apparatus connected to the pad for controlling the breakdown voltage of the SCR, and apparatus for controlling the resistor apparatus to a high resistance value in the absence of the application of the operation voltage whereby the SCR is controlled to break down at a low ESD voltage which is lower than a circuit damaging voltage, and to be of low resistance value upon the application of the operation voltage whereby the SCR is controlled to break down at an ESD voltage which is higher than the low ESD voltage.
REFERENCES:
patent: 5400202 (1995-03-01), Metz
Gerson Brian D.
Harris Colin
Iniewski Kris
LeBlanc David
Gaffin Jeffrey A.
Jackson Stephen
Pascal E. E.
PMC-Sierra Inc.
Wilkes R. A.
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