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. 02, 2002
Filed:
Sep. 22, 1999
Yoko Horiguchi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention provides an excellent input/output protective device which has a withstand voltage of 200 V or more in device simulation tests according to the EOS/ESD standard. There is presented an input/output device having a protective element that prevents external noise from degrading the internal circuit therein by inducing an electric discharge between diffusion layers of the second conductive type thereof which are disposed on a semiconductor substrate of the first conductive type and facing each other; wherein there are equipped with a plurality of contacts each of which connects a metal wiring layer with a diffusion layer; and a contact at the end section of the protective element on the side of the input section, at least, is provided with a means to increase the resistance thereof so as to make that larger than the resistance of the other contacts.