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. 11, 2002
Filed:
May. 02, 2000
Applicant:
Inventor:
Kyoji Yamasaki, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
A self-refresh circuit included in a semiconductor integrated circuit includes a ring oscillator, a double period counter, an SELF generating portion generating a signal SELF corresponding to an internal RAS, and a BBUE generating portion. The double period counter performs a count operation, using the output signal of the double period counter as a basic signal. The BBUE generating portion generates a BBUE signal in accordance with the output of double period counter. When the BBUE rises to H-level, the self-refresh signal SELF corresponding to signal SELF is issued. A layout area can be small, and timing of entry in a self-refresh mode can be finely set.