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. 28, 2002
Filed:
Mar. 14, 2001
Applicant:
Inventors:
Satoru Tamada, Tokyo, JP;
Tatsuya Saeki, Tokyo, 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
There is provided a non-volatile semiconductor device having a memory cell in which a threshold value voltage changes in accordance with the application of the writing pulse having a predetermined width and voltage with respect to word lines and bit lines and data depending upon the threshold value voltage is written, wherein writing failure is generated in the first time data writing operation, and a writing condition is set for suppressing the writing condition is set which is capable of suppressing the writing failure rate than the case of the first time writing operation when the writing operation is re-executed.