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Description

The STM705/706/707/708/813L supervisors are self-contained devices which provide microprocessor supervisory functions. 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 STM707/708) as well as a power-fail comparator 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

■ 5 V operating voltage

■ Precision VCC monitor

– STM705/707/813L

– 4.50 V ≤ VRST ≤ 4.75 V

– STM706/708

– 4.25 ≤ VRST ≤ 4.50 V

■ RST and RST outputs

■ 200 ms (typ) trec

■ Watchdog timer - 1.6 s (typ)

■ Manual reset input (MR)

■ 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