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. 02, 2001
Filed:
Aug. 15, 1995
Osamu Kitade, Hyogo, JP;
Takahiro Komatsu, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A power supply voltage detecting circuit detects whether or not a power supply voltage Vcc is a predetermined reference voltage level or more. The power supply voltage detecting circuit generates a self-refresh mode instruct signal &phgr;A to apply the same to a refresh timer when the power supply voltage detecting circuit determine that the power supply voltage Vcc is a predetermined voltage value or less. The refresh timer carries out a clocking operation in response to the self-refresh mode instruct signal &phgr;A to generate a self-refresh request signal &phgr;srf at a predetermined time interval. A semiconductor memory device is implemented which can carry out the self-refresh mode easily without requiring a complicated timing condition of external signals.