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. 24, 1999
Filed:
Feb. 20, 1998
Applicant:
Inventor:
Tsuyoshi Hirakawa, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518503 ; 36518511 ; 36518519 ; 36523003 ;
Abstract
A flash EEPROM has a plurality of multi-valued memory cells grouped in a plurality blocks or pages for parallel programming. If the data values for parallel programming include data '10' for a first group, data '01' for a second group and data '00' for a third group of memory cells in a page, a first voltage corresponding to data '10' is applied to the first through third groups, a second voltage corresponding to data '01' is applied to the second and the third groups, and a third voltage corresponding to data '00' is applied to the third groups, thereby reducing the programming time length for the parallel programming.