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    • 10. 发明授权
    • Semiconductor storage device
    • 半导体存储设备
    • US08427864B2
    • 2013-04-23
    • US13375751
    • 2010-06-02
    • Takayuki KawaharaKiyoo ItohRiichiro TakemuraKenchi Ito
    • Takayuki KawaharaKiyoo ItohRiichiro TakemuraKenchi Ito
    • G11C11/00
    • H01L43/08G11C11/161G11C11/1675H01L27/228
    • To write information on a memory cell of SPRAM formed of an MOS transistor and a tunnel magnetoresistive element, the memory cell is supplied with a current in a direction opposite to a direction of a current required for writing the information on the memory cell, and then, the memory cell is supplied with a current required for writing. In this manner, even when the same information is sequentially written on the memory cell, since the currents in the two directions are caused to flow in pairs in the tunnel magnetoresistive element of the memory cell each time information is rewritten, deterioration of a film that forms the tunnel magnetoresistive element can be suppressed. Therefore, reliability of the SPRAM can be improved.
    • 为了在由MOS晶体管和隧道磁阻元件形成的SPRAM的存储单元上写入信息,向存储单元提供与在存储单元上写入信息所需的电流方向相反的方向的电流,然后 ,为存储单元提供写入所需的电流。 以这种方式,即使当相同的信息被顺序地写入存储单元时,由于每当信息被重写时,两个方向上的电流成对地在存储单元的隧道磁阻元件中成对流动,所以, 可以抑制隧道磁阻元件的形成。 因此,可以提高SPRAM的可靠性。