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LM73: Absolute Max Ratings

Shinichi Yokota
Genius 9715 points
Part Number: LM73

Hello,

I found a tricky description in the 6.1 Absolute Maximum Ratings section of LM73, and I'd like to confirm it.

  • Voltage at All Other Pins: -0.3 V (Min), (VDD + 0.5 V) (Nom), 6 V (Max)

I've never seen a nominal value in the Absolute Max Ratings section of any other products, and I'm wondering how to interpret it.

In a schematic, +3.3 V is supplied to the LM73's VDD pin, and its /ALERT pin is tied to other +3.3 V through a 4.7-kΩ pull-up resistor. When the system shuts down, the VDD voltage first goes down, and after a few milliseconds the +3.3-V pull-up voltage is turned off. In other words, the /ALERT voltage is temporarily higher than VDD + 0.5 V for a few milliseconds during the shutdown sequence, and I'm worried if it could damage the LM73. However, I suspect it's no issue if I can refer to the Max absolute Max value of 6 V.

I'd appreciate if you confirm.

Best regards,
Shinichi Yokota