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:
Jul. 22, 2003
Filed:
Oct. 31, 2001
Eiji Aoki, Yamatokoriyama, JP;
Hidechika Kawazoe, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A protection circuit for protecting a semiconductor device from being damaged due to an excessively high applied voltage, includes a P-type MOS transistor provided between an external input-output terminal and a power supply line, an N-type MOS transistor provided between the P-type MOS transistor and a ground line, a first thyristor provided between the external input-output terminal and the ground line, the anode portion being connected to the external input-output terminal side, and the cathode portion being connected to the ground line, a second thyristor provided between the power supply line and the ground line, the anode portion being connected to the power supply line, and the cathode portion being connected to the ground line, and a resistance portion provided at a predetermined location of a conductor extending from a branch node between the P-type and N-type MOS transistors to the power supply line via the P-type MOS transistor.