It asserts a reset signal when any monitored voltage drops below its threshold and holds reset for a minimum of 140 ms after all rails return to tolerance. The three voltage thresholds are set at 2.93 V, 4.55 V, and an adjustable input — a common combination for tracking a 3.3 V core rail, a 5 V I/O rail, and a third supply that can be set with an external resistor divider.
Voltage thresholds and rail coverage
The 2.93 V threshold monitors a 3.3 V rail with roughly 370 mV of hysteresis below nominal — enough margin to catch a brownout before the downstream logic glitches. The 4.55 V threshold covers a 5 V rail, and the adjustable input lets you monitor a 1.8 V, 2.5 V, or other intermediate rail without a second supervisor IC. The push-pull, totem-pole output drives CMOS logic inputs directly; no external pull-up resistor is needed. Both active-high and active-low reset signals are available, so the part can interface with processors that require either polarity.