STM818LM6E

5 V主管与电池切换 5 V supervisor with battery switchover

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-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 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.

Features

■ 5 V operating voltage

■ NVRAM supervisor for external LPSRAM

■ Chip-enable gating STM818 only for external LPSRAM 7 ns max prop delay

■ RST and RSToutputs

■ 200 ms typ trec

■ Watchdog timer - 1.6 sec typ

■ Automatic battery switchover

■ Low battery supply current - 0.4 µA typ

■ Power-fail comparator PFI/PFO

■ Low supply current - 40 µA typ

■ Guaranteed RSTRST 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