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:
Oct. 01, 2019
Filed:
Apr. 23, 2018
Applicant:
Winbond Electronics Corp., Taichung, TW;
Inventors:
Im-Cheol Ha, Taichung, TW;
Shang-Wen Chang, Taichung, TW;
Assignee:
Winbond Electronics Corp., Taichung, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 16/34 (2006.01); G11C 16/04 (2006.01); G11C 7/08 (2006.01); G11C 7/10 (2006.01); G11C 16/28 (2006.01);
U.S. Cl.
CPC ...
G11C 16/3418 (2013.01); G11C 7/08 (2013.01); G11C 7/1063 (2013.01); G11C 16/0483 (2013.01); G11C 16/28 (2013.01); G11C 16/3459 (2013.01);
Abstract
A non-volatile memory apparatus and a refresh method thereof are provided. A control circuit determines whether threshold voltages of memory cells in a memory sectors are larger than a refresh read reference voltage and smaller than a refresh program verify reference voltage, and the control circuit determines that a memory cell needs refreshing if the threshold voltage of the memory cell is larger than the refresh read reference voltage and smaller than the refresh program verify reference voltage.