2.18V threshold, 100 ms timeout — the BOM-fit decision
The ADM1816-R22ART-RL is a single-channel simple reset/power-on reset IC from Analog Devices, monitoring a single voltage rail with a 2.18 V threshold. When the monitored supply drops below this level, the active-low open-drain output asserts and holds reset for a minimum 100 ms timeout after the rail recovers — long enough for most MCUs and DSPs to complete their power-on initialization sequence before the core starts executing.
Package and footprint — SOT-23-3
Housed in the industry-standard SOT-23-3 package (TO-236-3 / SC-59), the part occupies minimal board area and shares the same 3-pin footprint as many other simple reset ICs. The surface-mount package suits automated assembly lines and is compatible with standard reflow profiles.