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. 25, 1999
Filed:
Feb. 23, 1998
Applicant:
Inventor:
Kunihiko Kato, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 3652257 ; 365 96 ; 327525 ; 326 38 ; 326 39 ; 326 41 ;
Abstract
A semiconductor memory device including redundancy decision circuitry having a block writing function is disclosed. The redundancy decision circuitry assigns a single fuse and a single transistor to each pair of upper and lower bits of a plurality of column addresses. Selectors each selects either one of particular upper and lower bits input thereto. The device therefore reduces the number of fuses corresponding to column mask signals to be used at the time of block writing, thereby reducing the area to be occupied by the redundancy decision circuitry.