Three-rail monitoring with adjustable threshold
The MAX6720UTSYD3: Monitors three voltage rails simultaneously: two fixed thresholds at 2.188 V and 2.925 V, plus one adjustable input that lets you set the trip point with an external resistor divider — useful when the third rail is non-standard or varies across board revisions. The active-low, push-pull reset output (no external pull-up needed) asserts when any monitored rail dips below its threshold and holds for a minimum 140 ms reset timeout after all rails return — long enough for downstream FPGAs and MCUs to complete their power-on reset sequence.