ADR510 reverse characteristics?

I don't see anything in the data sheet about the reverse characteristics of the ADR510 1.0 V reference.  Is there a protection diode between anode & cathode that becomes forward biased when the ADR510 is reverse biased?  I would like to use two ADR510s in inverse parallel to make a precision +/- 1 V clamp, but that wouldn't work with a protection diode in there.

Thanks,

Gerrit