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. 20, 2003
Filed:
Nov. 01, 2001
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Toyko, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 1/600 ;
U.S. Cl.
CPC ...
G11C 1/600 ;
Abstract
Operations of applying an erase pulse and further performing block program before erasure are executed in steps S and S before applying the erase pulse on a block by block basis. This narrows the distribution width of the threshold voltage, and reduces the number of the memory transistors to be subjected to over-erase verify so that a total erasing time of data of a flash memory can be reduced.