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:
Jun. 17, 2003
Filed:
Mar. 04, 2002
Hwi-Taek Chung, Kyunggi-do, KR;
Samusung Electronics Co., Ltd., Suwon, KR;
Abstract
A nonvolatile semiconductor memory device is provided, which supports an erase verify operation mode to determine whether an erased memory cell is lower than a maximal threshold voltage (e.g., 3V), and a test verify operation mode to determine whether the erased memory cell has a progressive fail characteristic. Once the memory device enters the test verify operation mode, a wordline voltage to be applied to a memory cell and a reference wordline voltage to be applied to a reference cell are generated. The wordline and reference wordline voltages generated in the test verify operation mode are set to be higher than those generated in the erase verify operation mode. This makes it possible to compare current flowing through the memory cell and reference cell at more than one level and to check a memory cell for a progressive (or potential) failing characteristic.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile