1.43V threshold — supervising a 1.8V rail
That threshold sits about 370 mV below a nominal 1.8V rail, giving enough headroom to catch a brownout before the downstream logic enters an undefined state. The output is open-drain, active low, so it can be wire-ORed with other reset sources or pulled up to a different voltage than the monitored rail.
100 ms timeout and industrial temperature range
After the supply rises above the threshold, the reset output stays low for a minimum of 100 ms before releasing.