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    • 2. 发明授权
    • Dynamic semiconductor memory device and method for controllig the
precharge/refresh and access modes thereof
    • 动态半导体存储器件和用于控制其预充电/刷新和存取模式的方法
    • US4907199A
    • 1990-03-06
    • US271489
    • 1988-11-15
    • Katsumi DosakaMasaki KumanoyaYasuhiro KonishiHiroyuki YamasakiTakahiro Komatsu
    • Katsumi DosakaMasaki KumanoyaYasuhiro KonishiHiroyuki YamasakiTakahiro Komatsu
    • G11C11/409G11C11/403G11C11/406G11C11/4094
    • G11C11/4094G11C11/406
    • A dynamic semiconductor memory device is divided into a plurality of blocks. An operation of the semiconductor memory device is in either of a normal mode and a refresh mode, depending on the level of a refresh signal. In the normal mode, at an off time period, a potential on a bit line pair is equalized and a precharge potential is applied to the bit line pair. At the access time, equalizing of the potential on the bit line pair and supply of the precharge potential are stopped in a selected block and then, a word line driving signal is raised. On the other hand, in the refresh mode, at the off time period, the potential on the bit line pair is held at "H" and "L" levels by a sense amplifier, so that the potential on the bit line pair is not equalized and the precharge potential is not supplied. On this occasion, a precharge potential generating circuit is electrically disconnected from a power supply. At the time of refresh operation, the sense amplifier is rendered inactive in the selected block, so that the potential on the bit line pair is equalized and then, the word line driving signal is raised.
    • 动态半导体存储器件被分成多个块。 根据刷新信号的电平,半导体存储器件的操作是正常模式和刷新模式。 在正常模式下,在关闭时间段,位线对上的电位被均衡,并且预充电电位被施加到位线对。 在访问时间,在所选择的块中停止位线对上的电位的均衡和预充电电势的供给,然后提高字线驱动信号。 另一方面,在刷新模式下,在关闭时间段,位线对上的电位由读出放大器保持在“H”和“L”电平,使得位线对上的电位不是 均衡,不提供预充电电位。 在这种情况下,预充电电位产生电路与电源电气断开。 在刷新操作时,读出放大器在所选择的块中变为无效,使位线对上的电位相等,然后提高字线驱动信号。