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ISO7841: Part to Part Skew temperature, aging dependency

Shota Mago
Expert 8260 points
Part Number: ISO7841


Hi team,

I'm an FAE supporting some industrial customers in Japan.

My customer provided some questions in terms of part-to-part skew for ISO7841 as follows.

  1. Does part-to-part skew vary depending on temperature?
  2. If yes, would it be possible to provide its data?
  3. Does part-to-part skew vary depending on either aging or repeating power ON/OFF?

I'm looking forward to hearing back from you.

Best regards,

Shota Mago

  • 0
    TI__Guru 55835 points
    Hi Shota-san,

    Please find below my inputs to questions you have listed, thanks.

    1. Yes, part-to-part skew is also temperature dependent but the spec listed in ISO7841 datasheet already covers temperature variation. For example, for 5V VCC the part-to-part skew time is specified as 4.5ns max. This means that this would be the maximum variation across operating temperature range of -55C to 125C.

    2. Like it is mentioned above, the data is already available in ISO7841 datasheet.

    3. Datasheet listed spec also considers aging into the spec. This means that, over the period of device's lifetime the part-to-part skew is going to be within datasheet limits. Repeated power up/downs do not impact part-to-part skew time.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    TI__Expert 8260 points

    Hi Rao-san

    I understood.

    Thanks for your quick reply!

    Best regards,

    Shota Mago