監控電路 CONDITIONING & INTERFACES
The STM705/706/707/708/813L supervisors are self-contained devices which provide microprocessor supervisory functions. A precision voltage reference and comparator monitors the VCCinput for an out-of-tolerance condition. When an invalid VCCcondition 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.
**Key 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 andRST 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) . GuaranteedRST (RST) assertion down to VCC = 1.0 V . Operating temperature: –40 °C to 85 °C (industrial grade) or –40 °C to 125 °C (automotive grade for the STM706 only) . RoHS compliance .
Lead-free components are compliant with the RoHS directive