Well, the data sheet does not mention a protection diode, but it does mention in the absolute max ratings: Voutmax = -0.3V ... Vin+0.3V. This means that with e.g. input = 0V, a possible voltage at the output must be limited to 0.3V, e.g. with a Schottky diode from Vo to Vi.
Does it answer your question?
Regards
/Peter
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