DRV8881E / nFAULT

Hi Team,

I understood nFAULT pin will be driven low when VM pin falls below the undervoltage lockout threshold voltage(6.4V max).
If VM gradually falls continuously less than 6.4V, when does nFault go to Hi-Z?

I believe nFAULT pin will be Hi-Z if VM pin falls low enough to 6.4V.
I assume nFault pin is pull-up to VM pin in this case.

Best Regards,
Yaita