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:
Aug. 12, 2003
Filed:
May. 08, 2002
Applicant:
Inventor:
Takahiro Tsuruda, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/604 ;
U.S. Cl.
CPC ...
G11C 1/604 ;
Abstract
A program data latch circuit supplies one of a write bit line potential and a write prohibiting potential corresponding to multilevel data to be written, to a bit line in accordance with a level of a write control signal in a write operation. On the other hand, a program sense latch circuit compares a threshold value of a memory cell transistor sensed through the bit line with a reference potential, changes the level of the write control signal if the threshold value becomes a value corresponding to the multilevel data and instructs output of the write prohibiting potential in a verification operation.