Two-rail watchdog for mixed-voltage boards
The Maxim Integrated MAX697CWE+ is a 2-channel multi-voltage supervisor in a 16-SOIC package. It monitors two independent supply rails and asserts both an active-high and an active-low reset output when either rail falls below its threshold. The reset outputs stay asserted for a minimum of 35 ms after all rails return to tolerance — long enough to let a typical microcontroller finish its oscillator startup and clear its power-on reset flag.
Package and mounting
The reset timeout is a minimum of 35 ms. The thresholds are adjustable via external resistors. The push-pull outputs sink and source current, eliminating the need for an external pull-up on the active-low line. The 0°C to 70°C commercial temperature range is the hard boundary. This supervisor belongs in an office switch, a bench power supply, or a lab instrument — not in a motor drive cabinet or an outdoor telecom enclosure. If the board sees an unheated warehouse in winter, pick an industrial-grade supervisor instead.
Lifecycle and sourcing reality
The MAX697CWE+ carries an Active lifecycle status with ROHS3 compliance. For a BOM freeze, this part is safe to commit — no PCN risk in the near term.