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:
Sep. 22, 1998
Filed:
Apr. 22, 1997
Makoto Miyazawa, Kanagawa, JP;
NEC Corporation, Tokyo, JP;
Abstract
A semiconductor integrated circuit device communicates with an external device through signal terminals, and is powered through power terminals; protective circuits are respectively connected to the signal terminals for discharging static electric charge through a shared conductive line to the power terminal connected to a ground line, and a potential level of the semiconductor substrate is propagated through the shared conductive line to a detecting circuit for reversely biasing the semiconductor substrate at intervals; and an interrupting circuit discriminates isolating state of the power terminal from the ground line so as to cut off a current path between the shared conductive line and the detecting circuit.