Three-rail supervisor in a SOT-23-8 footprint
The MAX6703ASKA+T is a three-channel multi-voltage supervisor from Analog Devices, monitoring up to three supply rails with a fixed threshold of 2.93 V on one channel and two adjustable inputs. The active-low, open-drain reset output asserts when any monitored voltage falls below its threshold and holds for a minimum of 140 ms after all rails recover, giving downstream logic time to stabilize before the system restarts.
Threshold flexibility for mixed-voltage boards
The other two channels are adjustable via external resistor dividers, so a single MAX6703ASKA+T can supervise a 1.8 V core supply, a 2.5 V I/O rail, and a 3.3 V bus all at once — reducing component count compared to using three single-channel supervisors. The SOT-23-8 package keeps the board footprint small, but the thermal impedance is higher than a larger SOIC — in a 125°C ambient the internal die temperature rise from self-heating is negligible because the supervisor draws microamps, so no derating is needed.