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US 9,805,774 B2Granted
Semiconductor memory device, a memory module including the same, and a memory system including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsKi Won Lee, Seung Jun Bae, Joon Young Park, Yong Cheol Bae
Life of this patent
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Abstract
A semiconductor memory device includes a ZQ calibration unit configured to generate a pull-up VOH code according to a first target VOH proportional to a power supply voltage and an output driver configured to generate a data signal having a VOH proportional to the power supply voltage based on the pull-up VOH code, wherein VOH means “output high level voltage.”
Claims20
A semiconductor memory device, comprising:
- a pull-up VOH control block configured to generate a first target VOH, the voltage level of the first target VOH being proportional to a power supply voltage (VDDQ);
- a ZQ calibration unit, during a ZQ calibration operation, configured to generate a pull-up VOH code in accordance with the first target VOH;
- and
- an output driver configured to generate a data signal having a first VOH level based on the pull-up VOH code, the first VOH level being an output high level voltage proportional to the power supply voltage,
- wherein the first target VOH has a voltage level of VDDQ/2.5 or VDDQ/3.
2 more elements
A memory system, comprising:
- a memory controller including an on-die termination (ODT) resistor for receiving a data signal;
- and
- a semiconductor memory device configured to send the data signal to the memory controller through a data bus, the semiconductor memory device comprising:
- a pull-up VOH control block configured to generate a first target VOH proportional to a power supply voltage (VDDQ), the first target VOH being one of VDDQ/2.5 and VDDQ/3;
- a ZQ calibration unit, upon receiving the first target VOH, configured to generate a pull-up VOH code according to the first target VOH;
- and
- an output driver configured to generate a data signal having a first VOH level based on the pull-up VOH code, the first VOH level being an output high level voltage proportional to the power supply voltage.
4 more elements
Dependencies are inferred from the claim text.