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    • 25. 发明公开
    • Memory cell, nonvolatile memory device and control method therefor, improving reliability at low power supply voltage
    • 存储器单元,为此非易失性存储装置及其控制方法,在低电源电压可受理改进
    • EP1239492A3
    • 2003-01-15
    • EP02090098.1
    • 2002-03-06
    • NEC CORPORATION
    • Miwa, TohruToyoshima, Hideo
    • G11C14/00
    • G11C14/0072G11C14/00
    • For a memory cell comprising: a pair of memory nodes (Q0, Q1) for holding a pair of complementary voltages; a pair of switching elements (M0, M1) for controlling the connection between each memory node (Q0, Q1) and a bit line (BLN, BLP) corresponding to the memory node (Q0, Q1) according to ON/OFF control by a common word line (WL); and a pair of ferroelectric capacitors (F0, F1) each of which is connected to a plate line (PL) and corresponding one of the memory nodes (Q0, Q1), storing operation of the memory cell is carried out by swinging the voltage of the plate line (PL) between a first voltage that is higher than power supply voltage (Vcc) of the memory cell and a second voltage that is lower than the ground potential while keeping the switching elements (M0, M1) in off states, thereby remanent polarization of the ferroelectric capacitors (F0, F1) is made larger. In addition, recall operation of the memory cell is carried out by driving the plate line (PL) to a third voltage that is higher than the power supply voltage (Vcc) or a fourth voltage that is lower than the ground potential so as to enlarge operation margin. By such storing operation and recall operation, the reliability of nonvolatile memory under a low power supply voltage (Vcc) can be improved.