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TCA9548A input fall time

NAOKI AOYAMA
Guru 11215 points
Other Parts Discussed in Thread: TCA9548A

Hello,

Our customer use the TCA9548A.

The spec of the I2C input fall time is 20ns+0.1Cb (min.).

But  the customer inputs signal as less than 10ns.

Is it OK? Is there any problem?

Best Regards,

Naoki Aoyama

  • 0
    TI__Expert 5140 points

    Hi Naoki,

    Although, this is in violation with I2C specification, I have not usually seen an issue in performance. One thing to keep in mind is if you have a large amount of trace inductance, you may see a lot of undershoot.

    Also, take a look at the new I2C specification for the fall time:

    Thanks,

    Siby

  • 0 in reply to Siby James
    Guru 11215 points
    Hello Siby,

    Thank you for your reply.
    I will feedback the customer this information.

    Thanks,

    Naoki Aoyama