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ADC32RF45: ADC32RF45 SPI port Absolute Maximum(Minimum) Rating

Jade Goo
Intellectual 1940 points
Part Number: ADC32RF45

Hi Team,

Absolute Minimum spec about SPI port is -0.2V while other ports are -0.3V.
Would you recheck SPI port minimum range?
Customer SPI undershoot level almost -0.27V whilch means out of spec and might be damged with -0.27V.
Thank you.

Best Regards,
Jade

  • 0
    TI__Mastermind 29220 points

    Hi,

    Since the 0.2V tolerance below ground seems to match the 0.2V tolerance above the supply, that does not look to me to be an accident or typo - but I have asked the design team about it. 

    Also, if your concern is about a transient signal (undershoot) rather than a static long term value that violates the spec, then I am generally less concerned about that.  If there were some reason that the input signals was at a logic low level below -0.2V for the duration of the signal then that would be a concern.  A brief transient that barely crosses the limit is less of a concern. Still, if it is possible to do something to dampen the undershoot such as a termination resistor on the signal then that would be better yet.  Maybe a series termination at the source of the signal at the driver or a parallel termination resistor at the terminus of the signal.

    Regards,

    Richard P.