| 摘要 |
A calibration circuit of an on die termination device is provided to change a calibration code by controlling a level of a reference voltage by a control signal. A reference voltage generating part(310) outputs a reference voltage in response to one or more control signal. A code generating part(320) generates one or more calibration code in response to the reference voltage and a voltage of one or more calibration node, and includes a comparator, a counter, and a calibration resistance part. The comparator(321) compares the calibration node with the reference voltage. The counter(322) counts the calibration code according to a compared result of the comparator. The calibration resistance part(323) is connected to the calibration node. A resistance value of the calibration resistance part is determined by an inputted calibration code.
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