ADuM7442S Digital Isolator UVLO Specifications

To Whom it May Concern,

I have a few questions about the ADuM7442S.

1. What are the under voltage lockout specifications for the ADuM7442S if any? I don’t think that there’s anything in the datasheet, just recommended operating conditions.

2. The ADuM7442S datasheet shows figure 2 as the “safety-limiting current” for the package as a thermal consideration.  I am wondering what kind of limits are on the current for a single input pin when the ESD diode is forward-biased.  I can’t imagine that at 50C it’s >250mA for a single pin, it can’t be limited by just the package heating. (If this question makes sense to you, then please feel free to answer.)

Thank you.

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  • Hello,

    I'm looking into the UVLO question and will update this thread when I have more info.

    Regarding the safety limiting data - this is meant to provide guidance on fault tolerance. The total power dissipated during a fault condition should be below what's indicated in the curve in order to maintain integrity of the isolation barrier. It's not specific to a particular I/O pin, and is not meant as a normal operating condition. The ESD diodes are not specified to carry current since they shouldn't be biased under normal operation, but we typically recommend a 1 mA limit if there are short transient conditions where they may become forward biased.

    DaveC

Reply
  • Hello,

    I'm looking into the UVLO question and will update this thread when I have more info.

    Regarding the safety limiting data - this is meant to provide guidance on fault tolerance. The total power dissipated during a fault condition should be below what's indicated in the curve in order to maintain integrity of the isolation barrier. It's not specific to a particular I/O pin, and is not meant as a normal operating condition. The ESD diodes are not specified to carry current since they shouldn't be biased under normal operation, but we typically recommend a 1 mA limit if there are short transient conditions where they may become forward biased.

    DaveC

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