Three-rail voltage supervisor in an 8-SOIC
The Texas Instruments TPS3511D is a multi-voltage supervisor that monitors three supply rails simultaneously: 3.3 V, 5 V, and 12 V. It asserts an active-low, open-drain reset output when any monitored voltage falls below its threshold, with a minimum reset timeout of 100 ms. The open-drain output lets you wire-OR the reset signal with other supervisors or pull it up to a different logic rail, common in multi-voltage systems where the supervisor runs from a lower-voltage supply than the monitored rails.
Surface-mount assembly keeps the pick-and-place cost in line with volume production.