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:
Aug. 29, 1995
Filed:
Jan. 25, 1993
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 36523003 ;
Abstract
An improved SRAM is disclosed including a plurality of memory blocks each having a redundancy memory cell to be shared. In redundancy row decoders 50a, 50b, 50c provided in each memory block, a memory block to be remedied is programmed. Accordingly, a redundancy memory cell row corresponding to each redundancy row decoder can be used for remedy of a defect memory cell in another memory block. Since a defect memory cell may be remedied flexibly, the yield rate in production of semiconductor memories is improved.