Low voltage silicon controlled rectifier structure for esd input pad protection in cmos ic's
CA 2197291 C · Owner: Leblanc, David · Inventors: Harris, Colin; Leblanc, David; Gerson, Brian D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 11, 1997 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.