Push-pull output — no external pull-up resistor needed
The DS1812R-15+T&R uses a push-pull, totem-pole output stage. That means the reset output drives both high and low actively — no external pull-up resistor is required. In contrast, an open-drain output would need a pull-up to the reset input's supply. The output is active-high, so the reset signal goes high when the monitored voltage is below threshold, and goes low (or high-impedance, depending on the design) when the voltage is good. Verify that your processor's reset input is active-high; if it expects an active-low reset, this part will not work without an inverter.
It is also ROHS3 compliant.