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TIOS1023: NFAULT max voltage tolerance

Lev Persits
Prodigy 60 points

Part Number: TIOS1023

We have connected the NFAULT through a 10K PU to +24V VCC pin on TIOS1023.

Will the NFAULT pin tolerate this voltage given we adhere to the absolute maximum rating of NFAULT current being < 5mA?

Thanks!

Lev

  • 0
    TI__Mastermind 36191 points

    Hi Lev,

    Thank you for the question, I see that the abs max rating for the NFAULT pin is not clearly stated in the datasheet.  However, it is intended to be connected to the VCC_OUT pin with a pull-up resistor which is at 3.3V. Typically with open-drain pins the maximum current level is the more critical parameter that needs to be considered.  However, this does assume it is pulled up to the correct voltage potential. 

    I would refer you to our Pin Failure Mode Analysis (Pin FMA) section in the TIOS102x Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA document (Link) which classifies a short between the NFAULT and VCC pins as a Class A failure that could result in device damage.  I realize that this is not considering a short-circuit and not a 10k pull-up connection between the pins but the higher voltage potential could damage to the NFAULT transistors even if the current is limited to less than 5mA.

    Regards,

    Jonathan