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    • 9. 发明公开
    • Semiconductor memory and refresh cycle control method
    • Halbleiterspeicher und Steuerungsverfahrenfürden Auffrischungszyklus
    • EP1858024A1
    • 2007-11-21
    • EP07107117.9
    • 2007-04-27
    • Fujitsu Ltd.
    • Mori, Kaoru
    • G11C11/406
    • G11C11/406G11C7/04G11C11/401G11C11/40626G11C29/02G11C29/028G11C2029/0409G11C2029/5002G11C2211/4061G11C2211/4067
    • A semiconductor memory and a refresh cycle control method that reduce a standby current by properly changing a refresh cycle according to the temperature of the semiconductor memory. A temperature detection section (101) detects the temperature of the semiconductor memory. A cycle change control section (102) sends a cycle change signal for changing a refresh cycle when the temperature of the semiconductor memory reaches a predetermined cycle change temperature. A refresh timing signal generation section (103) generates a refresh timing signal and changes the cycle of the refresh timing signal in response to the cycle change signal. A constant current generation circuit (104) generates an electric current for generating the refresh timing signal. A low-temperature constant current setting circuit (105) designates the level of the electric current generated in the case that the temperature of the semiconductor memory is lower than or equal to the cycle change temperature. A high-temperature constant current setting circuit (106) designates the level of the electric current generated in the case that the temperature of the semiconductor memory is higher than the cycle change temperature.
    • 一种半导体存储器和刷新周期控制方法,其通过根据半导体存储器的温度适当地改变刷新周期来减少待机电流。 温度检测部(101)检测半导体存储器的温度。 当半导体存储器的温度达到预定的周期变化温度时,循环变化控制部分(102)发送用于改变刷新周期的循环改变信号。 刷新定时信号生成部(103)生成刷新定时信号,根据周期变更信号改变刷新定时信号的周期。 恒定电流产生电路(104)产生用于产生刷新定时信号的电流。 低温恒流设定电路(105)表示在半导体存储器的温度低于或等于循环变化温度的情况下产生的电流的电平。 高温恒流设定电路(106)表示在半导体存储器的温度高于循环变化温度的情况下产生的电流的电平。