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TAS5805M: I2C bus Timing requirements

Part Number: TAS5805M

Hi team,

There are decription in I2C bus timing requiremnts 1.3us min in "Low period of the SCL clock". The I2C fast mode is 400kbps, so the low period will be 1/400k *1/2 = 1.25us. Why is the minimum 1.3us? Where's my understandings incorrect?

Best regards,

Hideki