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TAS2560: TAS2560 I2C Rise Time and Fall Time Specification Review

Part Number: TAS2560

Hi Sirs,

My customer reported an issue of I2C rise time (2.979ns) and fall time (3.867ns) out of specification. The I2C clock rate is 315.8kHz.
I think the faster rise time and fall time should be fine for the I2C communication, while we need BU's confirmation.



I2C specification:



TAS2560 specification:



Thank you and Best regards,

Wayne Chen
06/25/2021

  • Hello Wayne, 

    Are they using 400pF for the minimum spec to compare to the TAS2560 datasheet? If they are faster than that, it is likely just due to a smaller capacitance on each bus line due to the board design. I don't think there is any issue from this perspective.

    For the I2C specification, I believe the I2C spec is to eliminate any spikes or ringing on the lines that could occur if the rise/fall time is too fast. One change that can be made to stay within the spec is to add in a small series resistor to the bus lines. 

    Do you know if the I2C waveforms have any ringing or abnormal behavior during normal operation? This may be the best indication that a change needs to be made to meet the I2C specifications. 

    Best Regards, 

    Justin Beigel

  • Hello Justin,

    Thank you for your elaborate answer. There is no significant ringing with customer's I2C waveforms, hence we can close this issue with customer.



    Thank you and Best regards,

    Wayne Chen
    06/30/2021