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STM802T/S/R：3V Supervisor

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 write-protect external LPSRAM. A precision voltage reference and comparator monitors the V_CCinput for an out-of-tolerance condition. When an invalid V_CCcondition 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.

Key Features

• RST orRST 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)
• GuaranteedRST (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

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Application Notes

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