Refresh period generating circuit
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United States of America Patent
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Feb 10, 2009
Grant Date -
Nov 1, 2007
app pub date -
Jul 5, 2007
filing date -
Jul 16, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A refresh period generating circuit which generates a refresh period in refreshing a DRAM cell, comprising: an oscillation circuit which oscillates at a frequency with temperature dependence on ambient temperature; a dividing circuit which divides an oscillation output of the oscillation circuit; a temperature detector which detects the ambient temperature; and a selector which switches and selects among division outputs with respective frequencies from the dividing circuit based on an output of the temperature detector, and outputs a signal as a reference of the refresh period. The temperature dependence in the oscillation circuit includes a positive temperature coefficient in a predetermined temperature range, and does not include a positive temperature coefficient out of the predetermined temperature range. The selector switches the division outputs out of the predetermined temperature range.
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