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:
Dec. 01, 1987
Filed:
Mar. 18, 1986
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 88 ; 3072 / ; 307303 ; 361 93 ;
Abstract
A semiconductor integrated circuit device is provided which is equipped with a buffer portion which includes a pair of an input buffer portion and an output buffer portion. When an input circuit equipped with an input protection circuit is formed at the corresponding input buffer portion, circuit elements for an output circuit disposed at the output buffer portion are used in order to constitute the input protection circuit. Therefore, the circuit elements of the corresponding output buffer portion, which normally would be unused, are utilized to provide an important circuit function.