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TCA6418E: I2C Rise / Fall time question

Part Number: TCA6418E

Hello

I encounter an I2C measuring problem while using TCA6418e.

According to datasheet, minimum of fall time of I2C should be greater than 20+0.1Cb ns while running in fast mode. 

However, our measurement is around 12 to 14 ns, which is faster than specification.

What is the influence while the result does not meet?