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:
Feb. 15, 2005
Filed:
Nov. 19, 2002
Hiroshi Kato, Hyogo, JP;
Yasuhiko Taito, Hyogo, JP;
Tsukasa Ooishi, Hyogo, JP;
Jun Ohtani, Hyogo, JP;
Hiroshi Kato, Hyogo, JP;
Yasuhiko Taito, Hyogo, JP;
Tsukasa Ooishi, Hyogo, JP;
Jun Ohtani, Hyogo, JP;
Renesas Technology Corporation, Tokyo, JP;
Abstract
At the time of an operation of writing data to a specific memory cell in a memory block, a semiconductor memory device applies a write voltage for a predetermined period and, after that, performs a verifying operation by using a sense amplifier circuit and a comparator. When it is found as a result of the verifying operation that writing to the memory cell is insufficient, the writing operation is performed again by an instruction of a memory control circuit. At this time, the memory control circuit adjusts a write voltage.