1.521V threshold — matching the supervisor to the core rail
This precision threshold is tailored for 1.5V core supplies found in low-power MCUs, DSPs, and FPGAs — it asserts a reset before the core voltage drifts below the minimum operating level, preventing logic corruption.
Open-drain output and 65ms reset timeout
The active-low reset output is open-drain, which means the pull-up resistor can be tied to a different supply rail than the monitored 1.521V input. This is useful when the supervisor sits on a 1.5V domain but the downstream reset input of a 3.3V system needs a clean logic-high level.