Device for controlling temperature compensated self-refresh period
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United States of America Patent
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Dec 5, 2006
Grant Date -
Apr 27, 2006
app pub date -
Dec 7, 2004
filing date -
Oct 21, 2004
priority date (Note) -
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Abstract
A device for controlling a temperature compensated self-refresh period clamps a self-refresh signal at high temperature over a specific temperature to maintain the self-refresh period, thereby removing dependency on temperature. In the device, an oscillating signal having a period varied depending on temperature change is generated below a specific temperature, and a period of a first period signal is compared with that of the oscillating signal applied from a temperature compensated self-refresh circuit unit over the specific temperature. When the period of the oscillating signal is shorter than that of the first signal, a pulse width of an oscillating strobe signal generated in response to a plurality of division signals each obtained by dividing the period of the oscillating signal at a predetermined ratio is controlled, so that an oscillating period of the temperature compensated self-refresh circuit unit is kept at a fixed state.
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