SUMMARY DESCRIPTION
The STM690A/692A/703/704/802/805/817/818/819 Supervisors are self-contained devices which provide microprocessor supervisory functions with the ability to non-volatize and write-protect external LPSRAM. A precision voltage reference and comparator monitors the VCC input for an out-oftolerance condition. When an invalid VCC condition occurs, the reset output (RST) is forced low (or high in the case of RST). These devices also offer a watchdog timer (except for STM703/704/819) as well as a power-fail comparator (except for STM818) to provide the system with an early warning of impending power failure.
These devices are available in a standard 8-pin SOIC package or a space-saving 8-pin TSSOP package.

FEATURES SUMMARY
■ 5V OPERATING VOLTAGE
■ NVRAM SUPERVISOR FOR EXTERNAL LPSRAM
■ CHIP-ENABLE GATING (STM818 only) FOR EXTERNAL LPSRAM (7ns max PROP DELAY)
■ RST AND RST OUTPUTS
■ 200ms (TYP) trec
■ WATCHDOG TIMER - 1.6sec (TYP)
■ AUTOMATIC BATTERY SWITCHOVER
■ LOW BATTERY SUPPLY CURRENT - 0.4µA (TYP)
■ POWER-FAIL COMPARATOR (PFI/PFO)
■ LOW SUPPLY CURRENT - 40µA (TYP)
■ GUARANTEED RST (RST) ASSERTION DOWN TO VCC = 1.0V
■ OPERATING TEMPERATURE: –40°C to 85°C (Industrial Grade)
■ RoHS COMPLIANCE
   Lead-free components are compliant with the RoHS Directive.