The MAX16016/MAX16020/MAX16021 supervisory circuits monitor and control power supplies in microprocessor based systems. They can operate in the 1.53V to 5.5 V supply voltage range. 5V, 3.3V, 3V, 2.5V and 1.8V systems can be monitored with fixed reset thresholds.

The devices protect the CMOS RAM from erroneous data being written to it during power failure or brown outs by internal gating of CE signals. They also preserve the contents of the RAM in a brownout or power failure by automatically switching to backup power provided by a backup battery. They also allow low power operation for memories, real-time clocks and other digital logic on power failure. The devices assert a microprocessor reset output during power up, power down or brownouts to prevent code execution errors.

The MAX16016/MAX16020/MAX16021 feature an under-voltage comparator monitoring the power supply, allowing for orderly system shutdown. A watch dog timer monitors microprocessor activity and asserts the reset output or lowers the watchdog output when the microprocessor is inactive. The devices’ low line comparator monitors supply voltage with a threshold voltage and asserts a low level output prior to a reset condition during brownout to allow orderly system shutdown. Additional supervisory functions include battery testing function, battery freshness seal, battery on and battery OK indicator.

The devices are certified for operation in the -40°C to +85°C extended temperature range and are available in compact TDFN/TQFN packages.

Read More: http://datasheets.maxim-ic.com/en/ds/MAX16016-MAX16021.pdf