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. 17, 1989
Filed:
Feb. 26, 1988
Applicant:
Inventor:
Tatsunori Murotani, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365210 ; 365203 ;
Abstract
For preventing sense amplifier circuits associated with memory cells from misjudgment, there is proposed a semiconductor memory device comprising protection cells formed between memory cell array and peripheral circuits, and the protection cells are coupled to an additional bit line pair precharged to a predetermined voltage level approximately equal to those of bit line pairs coupled to the memory cells, so that no difference voltage takes place between the additional bit line pair and the neighboring bit line pair, thereby eliminating a difference in characteristics of the sense amplifier circuits coupled thereto.