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. 08, 1996
Filed:
Dec. 16, 1994
Applicant:
Inventors:
Yoshikazu Miyawaki, Hyogo, JP;
Takeshi Nakayama, Hyogo, JP;
Masaaki Mihara, Hyogo, JP;
Shinji Kawai, Hyogo, JP;
Minoru Ohkawa, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518518 ; 36518501 ; 36518911 ; 36518529 ;
Abstract
A source line of a memory array included in a flash memory is set to a 3V potential by a source line circuit, a power supply voltage of 6V is applied to a sense amplifier, and 3V is applied as the ground potential. After the setting of such potential conditions, reading of the memory array is performed. When current flows to the memory cells as a result of reading, it means that the memory cell has been erased. If the current does not flows through the memory cell, erasure pulse is applied again and every memory cell is verified.