Description
The STM690/704/795/802/804/805/806 supervisors are self-contained devices which provide microprocessor supervisory functions with the ability to non-volatize and writeprotect external LPSRAM. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance 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 STM704/795/806) as well as a power-fail comparator (except for STM795) 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
■ RST or RST outputs
■ NVRAM supervisor for external LPSRAM
■ Chip enable gating (STM795 only) for external LPSRAM (7 ns max prop delay)
■ Manual (push-button) reset input
■ 200 ms (typ) trec
■ Watchdog timer - 1.6 s (typ)
■ Automatic battery switchover
■ Low battery supply current - 0.4 µA (typ)
■ Power-fail comparator (PFI/PFO)
■ Low supply current - 40 µA (typ)
■ Guaranteed RST (RST) assertion down to VCC = 1.0 V
■ Operating temperature: –40 °C to 85 °C (industrial grade)
■ RoHS compliance
   – Lead-free components are compliant with the RoHS directive