What the 4.65 V threshold and 35 ms timeout mean on the bench
The MAX691CWE-T is a battery-backup supervisor IC from Analog Devices — it monitors a single supply rail at 4.65 V and asserts reset when the voltage dips below that threshold, holding the reset active for a minimum of 35 ms after the rail recovers. That 35 ms window is the time the system gets to stabilise before the processor starts executing code; if your board's power supply has a slow ramp or a glitchy start-up, this timeout gives the oscillator and PLL time to lock before the CPU fetches its first instruction.
Reset and output wiring
The part offers both active-high and active-low reset outputs, each driven by a push-pull stage — no external pull-up resistor needed on either pin. That means you can wire the active-low output directly to a microcontroller's /RST input and the active-high output to a power-good LED or an enable line on a downstream regulator without adding a resistor divider.
Package and temperature grade
The 16-SOIC package is straightforward to rework with hot air; the wide body gives you room to route traces between the pads without necking down below the fab's minimum clearance. Pin 1 is clearly marked with a dot on the package top, so orientation is unambiguous under a microscope.
It is RoHS non-compliant per the manufacturer's designation, so factor that into any EU or RoHS-restricted BOM line.