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. 15, 2005
Filed:
Nov. 26, 2002
Meng-huang Liu, Hsinchu, TW;
Chun-hsiang Lai, Taichung, TW;
Shin Su, Banchiau, TW;
Tao-cheng LU, Kaohsiung, TW;
Meng-Huang Liu, Hsinchu, TW;
Chun-Hsiang Lai, Taichung, TW;
Shin Su, Banchiau, TW;
Tao-Cheng Lu, Kaohsiung, TW;
Macronix International Co., Ltd., Hsinchu, TW;
Abstract
An ESD protection apparatus for a high-voltage input pad comprises a modulator connected between the input pad and a snapback device with first and second guard rings surrounding the modulator, third guard ring surrounding the snapback device, and first and second guard ring control circuits to control the guard rings such that the protection apparatus has higher triggering and holding voltages under normal operation and lower triggering and holding voltages under ESD event.