| 摘要 |
To improve the reliability of the phase change element, unwanted current should not be flown into the element. Therefore, an object of the present invention is to provide a memory cell that stores information depending on a change in its state caused by applied heat, as well as an input/output circuit, and to turn off the word line until the power supply circuit is activated. According to the present invention, unwanted current flow to the element can be prevented and thereby data destruction can be prevented.
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