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

over 9 years ago

0 Siby James over 9 years ago

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 NAOKI AOYAMA over 9 years ago 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

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TCA9548A input fall time