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. 26, 2004
Filed:
Apr. 02, 2003
Applicant:
Inventors:
Jun Ohtani, Hyogo, JP;
Tsukasa Ooishi, Hyogo, JP;
Assignee:
Renesas Technology Corp., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/606 ;
U.S. Cl.
CPC ...
G11C 1/606 ;
Abstract
At a time a voltage of 6V is applied to all word lines and memory cells connected to a bit line are all simultaneously subjected to a weak write operation using a channel hot electron. Furthermore at a subsequent time a voltage of approximately 2V is applied to a word line and any single memory cell connected to the word line is subjected to a verify operation. The series of the weak write and verify operations are repeated until this memory cell's threshold voltage attains 2V corresponding to an erased condition.