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TXS0102: fall time spec

Allan Fan
Expert 6020 points
Part Number: TXS0102

Hi expert,

Customer used TXS0102 and have some questions about fall time measurement although so far no any issues. 

They used it for i2c 1.8V <> 3.3V. there is a spec in DS that A port fall time 4.3 ~ 6.4ns. 

Here is their measured result:

May I clarify with you if any concern about the result? Cause in i2c standard Fast Mode, fall time could be 20 × (VDD/ 5.5 V) ~300 ns as well.

Thanks,

Allan

  • 0
    TI__Mastermind 20701 points

    Hey Allan,

    What was the loading condition of the device at the time of testing? Note that the specs in d/s were taken with test setup as shown below: 

    Regards,

    Jack 

  • 0 in reply to Jack Guan
    Prodigy 10 points

    Hi Allan

    I am using TXS0102 between CPU and four I2C device(different sensors, LED driver, TPM). 

    I am only used command to control one device to get the waveform.

    I would want to know what is possible impact of our result 14.97ns is over spec(4.3 ~ 6.4ns).

    Thanks.

    Jimmy

  • 0 in reply to Jimmy Liu
    TI__Mastermind 20701 points

    Hey Jimmy,

    With the given information it is difficult to make a clear judgment of any impacts on your system. If the seen fall time (tf) does not have any adverse effects on the device and surrounding I/Os, then it is ok to leave as is. Otherwise, feel free to share the schematic/ waveforms to see if there is anything we can do to debug. 

    Regards,

    Jack