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:
May. 16, 1995
Filed:
Dec. 09, 1992
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 365201 ; 36523003 ; 371 102 ;
Abstract
An SRAM disclosed herein includes 64 memory cell array blocks and a redundant memory cell array block. The redundant memory cell array includes a total of 16 redundant memory cell columns. A defect address indicating a location of a defective memory column is programmed in an address programming circuit, and the specific defecting column in the defect address is programmed in an I/O programming circuit. Although each memory cell does not include a spare memory cell column or row for redundancy, the defect can be repaired by using a redundant memory cell array, so that the high integration of the SRAM can be accomplished.