Three-rail supervisor for automotive power sequencing
The Texas Instruments TPS3307-18QDRG4Q1 is a multi-voltage supervisor that monitors three supply rails simultaneously — a 1.68V threshold for a 1.8V core, a 2.93V threshold for a 3.3V I/O bus, and an adjustable third channel for a configurable rail such as 1.2V or 5.0V. It asserts both an active-high and an active-low reset output (push-pull, totem pole) when any monitored voltage falls below its threshold, and holds reset for a minimum of 140 ms after all rails return to tolerance.