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, 2000
Filed:
Jan. 08, 1999
Yuto Ikeda, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor memory device comprising a plurality of word lines that come in two types: ordinary word lines planned to be used ordinarily, and redundant word lines to be used to replace any ordinary word line judged faulty. Boosting transistors are incorporated to boost all bit lines forcibly to a supply voltage. When the bit lines are brought to the supply voltage while the word lines are connected to ground, a memory cell may be found written with data represented by the supply voltage on the bit lines. This reveals a short-circuit between a bit line and the word line corresponding to the memory cell. The short-circuited word line is then replaced by a redundant word line.