Description
VBAT VCCO VCC GND PF
PF
WC/ SC RC IN
NMI ST
CEO CEI PBRST RST
RST
- +3-Volt Battery Input - Switched SRAM Supply Output - +5-Volt Power Supply Input - Ground - Power-Fail (Active High) - Power-Fail (Active Low) - Wake-Up Control (Sleep) - Reset Control - Early Warning Input - Non-Maskable Interru
Features
- Holds microprocessor in check during power transients Halts and restarts an out-of-control microprocessor Monitors pushbutton for external override Warns microprocessor of an impending power failure Converts CMOS SRAM into nonvolatile memory Unconditionally write-protects memory when power supply is out of tolerance Consumes less than 100 nA of battery current at 25°C Controls external power switch for high current.
DS1236 Datasheet
