The TPS389015DSET is a single-channel voltage supervisor that asserts a reset signal when the monitored supply drops below 1.5V. It is a Simple Reset/Power-On Reset type, meaning it holds the reset output low for a fixed timeout after the supply rises above the threshold — no external timing capacitor needed. The open-drain output lets you pull the reset line to any voltage up to the absolute maximum of the pin, making it straightforward to interface a 1.5V-threshold supervisor with a 3.3V or 1.8V logic input on the downstream processor.
The base product number TPS389015 covers the family, and this specific threshold variant (1.5V) is in current manufacture.