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:
Oct. 09, 1990
Filed:
Jul. 13, 1989
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 56 ; 361 91 ; 361111 ; 357 2313 ;
Abstract
An input protection circuit for MOS devices includes a first resistor and a first parasitic bipolar transistor connected between an input pad and an input buffer circuit of a MOS device. The input protection circuit for MOS devices further includes a second resistor and a second parasitic bipolar transistor connected at a preceding stage of the input buffer circuit so that the gate oxide film of the input buffer circuit can be protected from being damaged by static charges or a voltage which is accidentally generated, without increasing the pattern size of the first parasitic bipolar transistor.