Two-rail supervisor for multi-voltage system monitoring
The MAX6762TALAD3+T from Analog Devices is a multi-voltage supervisor that monitors two supply rails and asserts a reset signal when either falls below the threshold. The active-low, open-drain output holds the reset line low for a minimum of 100 ms after all monitored voltages recover, giving the system time to stabilize before the processor starts executing code. One channel is fixed at a 5 V threshold; the second is adjustable via an external resistor divider. The -40°C to 125°C operating range covers automotive under-hood and industrial motor-drive environments where the board sees wide thermal swings. The 8-TDFN (3x3) exposed-pad package helps conduct heat into the PCB ground plane, keeping the die temperature within limits even when the supervisor is powered continuously.
Reset timeout and output type — what they mean for the BOM
The 100 ms minimum reset timeout is the period the supervisor holds the reset line asserted after all monitored voltages are above threshold. That 100 ms window covers the power-on settling of most switching regulators and the oscillator start-up of a typical MCU. If the processor needs a longer reset pulse — for example, to wait for an external oscillator to stabilize — an external RC delay or a supervisor with a longer timeout would be needed. The open-drain output lets the reset line be shared with other open-drain devices (like a watchdog timer or a manual reset button) through a single pull-up resistor. The active-low polarity is the industry-standard convention for processor reset inputs; a supervisor with an active-high output would require an inverter or a different processor reset pin.
Package and mounting — board-level fit
The 8-TDFN (3x3) package with an exposed pad requires a thermal land pattern on the PCB. The exposed pad must be soldered to a ground-plane copper area for rated thermal performance; a layout that leaves the pad floating will raise the junction temperature and may reduce reliability at the upper end of the temperature range. The Cut Tape option suits prototype or low-volume builds where a full reel is not justified.
Lifecycle and sourcing posture
This is a part you can qualify into a new design without worrying about near-term obsolescence. The part is ROHS3 compliant, which covers the current EU RoHS exemption regime and avoids the paperwork burden of managing an exemption-expiring part.