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:
Jul. 23, 1996
Filed:
Jun. 05, 1995
Akihide Aoki, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Mitsubishi Electric Semiconductor Software Co., Ltd., Hyogo, JP;
Abstract
A nonvolatile semiconductor storage device has a sense characteristic modifying circuit for modifying the sense characteristic of a sense amplifier that amplifies the data in a memory cell and a volatilization discriminating unit that discriminates whether or not a memory cell suffers volatilization by comparing the level of a data read before modifying the sense characteristic and the level of a data read after modifying the sense characteristic. In this nonvolatile semiconductor storage device, the level of the data read on the basis of a sense characteristic with a more strict criterion is compared with the level of the data read on the basis of another sense characteristic with a less strict criterion, and it is discriminated whether or not the memory cell suffers volatilization on the basis of the result of the comparison.