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:
Feb. 03, 1998
Filed:
Dec. 21, 1995
Applicant:
Inventor:
Takayuki Harima, Kawaguchi, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 36518901 ; 365210 ;
Abstract
A semiconductor memory device includes memory cell array blocks and row spare cell groups provided for the memory cell array blocks adjacent to each other and each of the row spare cell groups having a plurality of spare cells for relieving defective memory cells in the adjacent memory cell array blocks. The row spare cell groups are shared by the plurality of adjacent memory cell array blocks, hence the spare cells are allocated corresponding to the defective cells found in the memory cell array blocks, thus enhancing a relieving rate by a redundancy circuit.