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. 23, 2001
Filed:
Jan. 06, 2000
Mitsutaka Niiro, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A complementary address generation circuit supplies a fuse select address signal as it is at a first fuse blow and converts the fuse select address signal to a complementary address and supplies the complementary address as an output at a second fuse blow. The output of the complementary address generation circuit is supplied to a fuse select circuit and the fuse select circuit selects a fuse group to which a substitution address is to be allocated. The fuse group used at the first fuse blow is selected in ascending order and at the second fuse blow the fuse group is selected in descending order. Thus, the spare used at the first fuse blow will be prevented from being used again in the second fuse blow and a repairable semiconductor memory device will not be rendered defective.