When the supply drops below that level, the active-low open-drain output pulls low and holds the downstream processor or FPGA in reset for a programmable timeout period. That adjustable timeout — set with an external capacitor — is the feature that makes this part flexible across different power-up timing requirements, from fast-booting MCUs to larger FPGAs that need tens of milliseconds before releasing reset.
Sourcing and lifecycle — no LTB concern
No last-time-buy or obsolescence notice on file.