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    • 5. 发明授权
    • 출력회로
    • KR100149501B1
    • 1998-12-01
    • KR1019900001997
    • 1990-02-19
    • 가부시끼가이샤 히다치 세이사꾸쇼히다치초엘에스아이 엔지니어링가부시키가이샤
    • 가지모또다께시신보유따까사또가쯔유끼오가따마사히로겐미자끼가네히데구보다쇼지가또노부오마니따기이찌가나미쯔미찌따로
    • H01L27/11
    • G11C29/027G11C11/406G11C11/4093G11C29/02G11C29/50G11C29/50012G11C29/50016G11C2029/5004
    • The semiconductor memory is facilitated with control circuitry for effecting plural self-refresh modes having respectively different refresh periods. The plural self-refresh modes are typified by a PS (pseudo) refresh mode which is applied when the memory is in the nonselected state for a comparatively long period of time, such as in the state in which memory backup is being facilitated, and by a VS (virtual) refresh mode in which the refreshing operation of the memory cells is effected intermittently during the intervals of memory accessings. The pseudo refresh mode has a longer refresh time period than the virtual refresh mode. The control circuitry also has counter circuits for the generating of refresh address signals in accordance with a first timing signal indicative of a pseudo refresh mode and a second timing signal indicative of a virtual refresh mode, the latter timing signal being a higher frequency signal. Such availability of plural self-refresh modes becomes particularly advantageous when considering consumption of the back-up power for maintaining the IC memory device versus stability of stored data. While the consumption of the back-up power for maintaining the device would be relatively lower under one of the self-refresh modes, namely, the PS (pseudo) refresh mode, the stability of data stored would, however, be greater under another self-refresh mode, namely, the VS (virtual) refresh mode.
    • 利用控制电路来促进半导体存储器,以实现具有各自不同的刷新周期的多个自刷新模式。 多个自更新模式以PS(伪)更新模式为代表,该PS(伪)更新模式在存储器处于非选择状态较长时间时,例如在便于存储器备份的状态下,以及通过 VS(刷新)模式,其中在存储器访问的间隔期间间歇性地实现存储器单元的刷新操作。 伪刷新模式具有比虚拟刷新模式更长的刷新时间段。 控制电路还具有用于根据指示伪刷新模式的第一定时信号和指示虚拟刷新模式的第二定时信号来产生刷新地址信号的计数器电路,后者定时信号是较高频率信号。 当考虑用于维护IC存储器件的备用电源的消耗与存储的数据的稳定性时,多个自刷新模式的这种可用性变得特别有利。 虽然在自刷新模式之一即PS(伪)刷新模式下,用于维护设备的备用电源的消耗相对较低,但是,在另一自我情况下,存储的数据的稳定性会更高 -refresh模式,即VS(虚拟)刷新模式。