Takashi-san, I'm not aware of why the rise time is limited to 300ns. However, this is also part of the standard I2C specification for I2C running in Fast Mode. It is also listed as 300ns. However, the specification for Standard Mode is 1000ns for rise time (but also 300ns for fall time). In the ADS1013 datasheet, there is no listing for the specifications for Standard Mode. If you need to limit the current used for communicating with the device, I would use an SPI interface instead. The ADS1018 is a similar device (but has two differential channels and a few extra features). Joseph Wu
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