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. 25, 1997
Filed:
Dec. 15, 1995
Applicant:
Inventor:
Lloyd P Matthews, Buda, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257328 ; 257106 ; 257173 ; 257356 ; 257546 ; 257551 ; 257605 ;
Abstract
A protection circuit (13) for an integrated circuit (10) is capable of handling higher externally-provided voltages supplied to internal circuitry within the integrated circuit (10). The protection circuit (13) comprises a zener diode (20), wherein a N+ type diffusion region (38) is separated from a P field implant (40) lying between the N+ type diffusion region (38) and a P+ type diffusion region (39).