Data backup device and step-up/step-down power supply
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United States of America Patent
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May 4, 2004
Grant Date -
N/A
app pub date -
Jan 16, 2002
filing date -
Jun 8, 2000
priority date (Note) -
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Abstract
When a power supply detection unit 5 detects an OFF command of a battery 2, a DRAM 1 is changed to a self-refresh mode. Then, power is fed from a backup power supply 4 to the DRAM 1.
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