The Maxim Integrated MAX6372KA+T is a single-channel watchdog supervisor IC in an SOT-23-8 package, delivering an active-low reset output from a push-pull, totem-pole stage. It monitors one voltage rail with an adjustable/selectable threshold, and its reset timeout is also adjustable — so you set both the trip point and the watchdog period to match the processor or ASIC it is guarding.
Both the voltage threshold and the reset timeout are adjustable/selectable on this part. That means one MAX6372KA+T can serve across multiple rail voltages in a design — you size the resistor divider for the monitored rail, set the watchdog period with a capacitor, and the same P/N covers the rail the micro needs.