| 摘要 |
A semiconductor memory device with a temperature sensing device is provided to measure temperature without noise condition, and to perform stable refresh by receiving a temperature value without an error. A semiconductor memory device comprises a temperature sensing unit(300A) for sensing present temperature in response to a control signal, and enters a mode without actual power consumption for a constant time from the enabling of the control signal. The mode without actual power consumption is an idle state or a power down mode. The control signal performs a driving for impedance matching of an ODT(On Die Termination) or OCD(Off Chip Driver) driver. The temperature sensing unit comprises a sensing part(330) for sensing present temperature in response to the control signal, an analog-digital conversion part(340) for converting an analog-output value of the sensing part into a digital level, and a register(350) for outputting a temperature value by storing the output value of the analog-digital conversion part.
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