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. 28, 2001
Filed:
Apr. 20, 2000
Applicant:
Inventors:
Marco Pasotti, S. Martino Sicc., IT;
Giovanni Guaitini, Trecella, IT;
Pier Luigi Rolandi, Monleale, IT;
Assignee:
STMicroelectronics S.r.l., Agrate Brianza, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 1/604 ;
U.S. Cl.
CPC ...
G11C 1/604 ;
Abstract
A method for erasing non volatile memories, in particular flash cells, that includes applying erasing pulses to the cells to be erased and to verify, after each pulse, the value of the threshold voltage of the cells. The erasing pulses are provided to the cells as long as the respective values of the threshold voltage are greater than the new values of threshold voltage corresponding to new data to be rewritten in the cells to be erased.