4.63V threshold, active-low open-drain reset — the BOM-fit decision
The MIC6315-46D2UY: This threshold is typical for a 5 V logic supply: a 4.63 V trip point means the reset fires before the downstream logic enters an undefined state, but after the supply has sagged enough to indicate a genuine brownout rather than a transient glitch. The 20 ms minimum reset timeout holds the processor in reset long enough for the supply to stabilise after a brownout event — a common requirement for microcontrollers that need a clean power-on reset sequence.
Package and temperature grade for the bill
Housed in a SOT-143 package (TO-253-4, TO-253AA), the device occupies a compact footprint on the PCB.