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. 27, 1996
Filed:
Jul. 14, 1994
Gi-Won Cha, Kyungki, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A circuit which controls a self-refresh period of a semiconductor memory device includes a pulse generating circuit which outputs a periodic pulse train in response to an external control signal, a frequency-dividing circuit which outputs a plurality of pulse trains having different respective periods by frequency-dividing the pulse train, at least one temperature detector which detects an ambient temperature of the memory device and outputs a temperature detection signal when the ambient temperature exceeds a predetermined threshold level, at least one voltage detecting circuit which detects a power supply voltage applied to the memory device and outputs a voltage detection signal when the power supply voltage reaches a predetermined level, a combination pulse train generating circuit which outputs a plurality of combination pulse trains by variously combining the plurality of pulse trains output by the frequency-dividing circuit, and a pulse selecting circuit which outputs a self-refresh master clock by selecting one of the combination pulse trains in response to the voltage detection signal and the temperature detection signal.