4.625V threshold — the trip point that guards your rail
The MAX6444US46L+T: The reset output is active-low, open-drain, so it pulls the RESET line low when triggered and floats high when the rail is good. That open-drain output lets you wire-OR multiple supervisors or pull up to a different logic voltage than the monitored rail.
140ms reset timeout — why the delay matters
That delay gives the power supply and oscillator time to stabilise before the processor starts executing code — without it, the CPU could boot into an undefined state from a rail that hasn't fully settled. The device monitors only one voltage, so it fits designs where a single critical rail — typically the core or I/O supply — needs supervision. For multi-rail systems you'd stack multiple instances or use a multi-voltage supervisor.
Active production — no end-of-life pressure for this BOM line
The part ships in a SOT-143-4 surface-mount package (also referred to as TO-253-4 / TO-253AA), a common footprint for small-outline transistor and supervisor ICs.