One of my customer wants to know why the Vin absolute max ratings is limited as -9V and 14V.
They guess the limit would be +/- 9V or +/- 14V.
The absolute maximum DC voltage on RS-485 A, B, Y, Z bus pins can be down to - 9V.
The absolute maximum DC voltage on RS-485 A, B, Y, Z bus pins can be up to + 14V.
However, - 14 V is not possible. This is a device architecture limitation.
Operation at -9V or +14V is not recommended, this is a stress rating only, please see the ADM2587E data sheet.
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