The MAX6365PKA44+: The 4.38 V threshold is set for monitoring a nominal 5 V supply rail — when the rail drops below 4.38 V, the reset asserts. That 150 ms minimum reset timeout gives the power supply time to settle and the oscillator to stabilize before the processor starts executing code. Because it monitors only a single voltage, this part fits designs where one critical rail needs supervision — a 5 V microcontroller supply, for example — and the other rails are monitored separately or are non-critical.
Package and temperature range
Housed in an 8-pin SOT-23 package, the MAX6365PKA44+ takes up minimal board space — about 2.9 mm × 2.8 mm — and is suited for compact, portable or space-constrained designs.