What this supervisor does on your board
The MAX6866UK16D3S+T is a single-channel voltage supervisor from Maxim Integrated — a simple reset/power-on reset device that monitors a 1.575V threshold rail and holds the reset output low for a minimum of 150ms after the supply rises above that threshold. The push-pull output drives the reset line directly, no external pull-up needed. This is the part you drop onto a 1.8V or 1.5V core supply to sequence an MCU, FPGA, or SoC cleanly at power-up.
1.575V threshold — what it covers
The 1.575V threshold sits between the 1.5V and 1.8V nominal supply rails common in low-voltage digital cores. If your monitored rail dips below that level — brownout, sag, or slow ramp — the reset asserts active low and stays asserted through the 150ms timeout after recovery.
ROHS3 compliant.