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. 13, 2000
Filed:
Feb. 12, 1998
Applicant:
Inventor:
Makoto Ihara, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365222 ; 36518525 ; 36518527 ; 365203 ;
Abstract
A semiconductor storage device has a leak-monitoring capacitor connected to a bit line pre-charge potential generator, and a pre-charging transistor for charging one end of the leak-monitoring capacitor with a first potential (Vcc). The bit line pre-charge potential generator discharges from the leak-monitoring capacitor an amount of electric charges corresponding to a leak generated at a bit line pre-charge potential line which is connected with bit lines. A refresh timer circuit generates a clock signal in a cycle corresponding to a time in which the potential of the one end of the leak-monitoring capacitor decreases from the first potential (Vcc) to a second potential.