| 摘要 |
A self-refresh control circuit for a semiconductor memory device is provided to reduce current consumption, by controlling on/off of a periodic signal used to select a self refresh period according to temperature. An automatic period generation part(100) generates periodic signals with various periods. A temperature sensor part(200) detects internal temperature and provides a temperature detection signal. A selection part(500) provides one of the periodic signals as a periodic output signal to generate a self refresh command signal controlling self refresh operation.
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