The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2014
Filed:
Oct. 22, 2010
Bradley Jensen, San Jose, CA (US);
Charles Y. Chu, Cupertino, CA (US);
Bradley Jensen, San Jose, CA (US);
Charles Y. Chu, Cupertino, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
Integrated circuits with electrostatic discharge (ESD) protection circuitry are provided. The ESD protection circuitry does not include polysilicon resistors. The ESD protection circuitry may include n-channel transistors coupled in parallel between an output node that is connected to an input/output pin and a ground terminal. The n-channel transistors may each have a drain terminal that is coupled to the output node through first metal paths and a source terminal that is coupled to the ground terminal through second metal paths. The first and second metal paths may be routed over gate terminals of the respective n-channel transistors to provide sufficient resistance. The first and second metal paths may provide desired pull-down resistance in the ESD protection circuitry so that the ESD protection circuitry can sink sufficient current through each of the n-channel transistors to protect internal circuitry from damage in an ESD event.