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:
Feb. 15, 2000
Filed:
Mar. 16, 1998
Tomio Suzuki, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The semiconductor memory device has a normal operation mode and a self-refresh mode, and includes a V.sub.BB generation circuit generating a first substrate voltage when an internal power supply voltage is larger than a predetermined value and a second substrate voltage of an absolute value smaller than that of the first substrate voltage when V.sub.CC is smaller than the predetermined value, a bit line equivalent voltage generation circuit outputting voltage V.sub.CC /2 produced by resistive dividing when internal power supply voltage is lower than the predetermined value in self-refresh mode, a 4KE signal generation circuit generating a signal for performing a 4K operation in the self-refresh mode when internal power supply voltage is lower than the predetermined value and a refresh address generation circuit.