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:
Oct. 05, 1999
Filed:
Dec. 19, 1996
Ming-Chien Chang, Hsinchu, TW;
Abstract
An input/output electrostatic discharge (ESD) protection circuit for an integrated circuit disposed between an input/output port and the internal circuitry, including an input path protection device and an output path protection device. The output path protection device includes a pair of pull-up and pull-down transistors, two resistors, and a first and a second MOS field effect transistors respectively connected in parallel with the pull-up and the pull-down transistors. The resistors are formed in lightly-doped regions of the source or drain of the pull-up and pull down transistors, respectively, so the series resistance can be reduced efficiently, the driving ability can be prevented from decreasing and the devices can obtain uniform breakdown under intensive layout circumstances. The first and the second MOS field effect transistors are utilized to protect against both positive electrostatic stress and negative electrostatic stress to improve overall ESD protection.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile