| 摘要 |
An oscillator of a semiconductor memory device, wherein a reference voltage that flexibly shifts according to the shift in a power supply voltage is generated, and a reference clock is generated using the reference voltage. It is thus possible to generate the reference clock having a constant cycle regardless of the shift in the power supply voltage which can keep constant the duration period of internal control signals of devices, such as a timer and a pump circuit, which are synchronized to the reference clock.
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