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:
May. 04, 2004
Filed:
Aug. 05, 2002
Applicant:
Inventors:
Assignee:
Renesas Technology Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 ; G11C 7/04 ;
U.S. Cl.
CPC ...
G11C 7/00 ; G11C 7/04 ;
Abstract
A bias voltage having a positive temperature dependency is supplied to a current source that determines the operating current of a refresh timer that issues a refresh request to allow the driving current of the current source to have a positive temperature characteristic. In this manner, the refresh cycle of the refresh timer shortens the issue intervals when the temperature rises, and lengthens the issue intervals of the refresh request when the temperature decreases. Thus, the consumed current for the refresh at room temperature is reduced. Consequently, the consumed current in a self-refresh mode under the room temperature condition can be reduced.