TPS2069C: Pull-high power rail design for TPS2069C

Hi team, 

For the FLT# pin of TPS2069C, as it seems to be OD design, is it OK to have 1.8V or lower voltage as its pull-high power rail?

And is there timing requirement about the FLT# pull-high rail and the input power of the IC? (Will there be leakage if the 1.8V pull-high of FLT# comes earliest)

Thanks

Max