Static information storage and retrieval – Powering – Data preservation
Patent
1999-05-25
2000-10-17
Le, Vu A.
Static information storage and retrieval
Powering
Data preservation
365226, 365227, G11C 700
Patent
active
061341711
ABSTRACT:
A variable impedance power supply line and a variable impedance ground line supplying voltages VCL1 and VSL1, respectively, are set to a low impedance state in a stand-by cycle and in a row related signal set period, and to a high impedance state in a column circuitry valid time period. Variable impedance power supply line and variable impedance ground line supplying voltages VCL2 and VSL2, respectively, are set to a high impedance state in the stand-by cycle, and low impedance state in the active cycle and in the row related signal reset time period. Inverters operate as operating power supply voltage of voltages VCL1 and VSL2 or voltages VCL2 and VSL1, in accordance with a logic level of an output signal in the stand-by cycle and in the active cycle. Thus a semiconductor memory device is provided in which subthreshold current in the stand-by cycle and active DC current in the active cycle can be reduced.
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Arimoto Kazutami
Tsukude Masaki
Yamagata Tadato
Le Vu A.
Mitsubishi Denki & Kabushiki Kaisha
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