The TPS3610 family of supervisory circuits monitors and controls processor activity by providing backup-battery switchover for data retention of CMOS RAM. Other features include an additional power-fail comparator, low-line indication, watchdog function, battery-status indicator, manual switchover, and write protection for CMOS RAM.

The TPS3610 family allow usage of 3-V or 3.6-V lithium batteries as the backup supply in systems with, e.g., V_DD = 1.8 V. During power-on, RESET\ is asserted when the supply voltage (V_DD or V_BAT) becomes higher than 1.1 V. Thereafter, the supply-voltage supervisor monitors V_DD and keeps RESET\ output active as long as V_DD remains below the threshold voltage V_IT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset.