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:
Jan. 03, 1995
Filed:
Mar. 01, 1993
Applicant:
Inventor:
Koreaki Fujita, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 3652257 ; 36523003 ;
Abstract
Two redundant blocks RB1 and RB2 are provided independent from the normal memory cell block BL, and selection of the redundant block when redundancy is selected is carried out by a least significant column address signal Y0 and a signal /Y0 complementary thereto in a semiconductor memory device. Therefore, a semiconductor memory device can be provided in which when defective bits exist continuously in a memory cell array, the continuous defective bit can be replaced by two redundant bit lines.