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SUMMARY DESCRIPTION

The STM809/810/811/812 MICROPROCESSOR RESET Circuits are low-power supervisory devices used to monitor power supplies. They perform a single function: asserting a reset signal whenever the VCCsupply voltage drops below a preset value and keeping it asserted until VCChas risen above the preset threshold for a minimum period of time (trec). The STM811/812 also provide a push-button reset input (MR).

FEATURES SUMMARY

■ PRECISION MONITORING OF 3V, 3.3V, and 5V SUPPLY VOLTAGES

■ TWO OUTPUT CONFIGURATIONS

– Push-pull RSTOutput (STM809/811)

– Push-pull RST Output (STM810/812)

■ 140ms RESET PULSE WIDTH (MIN)

■ LOW SUPPLY CURRENT - 6μA (TYP)

■ GUARANTEED RST/RST ASSERTION DOWN TO VCC= 1.0V

■ OPERATING TEMPERATURE: –40°C to 85°C (Industrial Grade)

■ LEAD-FREE, SMALL SOT23 and SOT143 PACKAGE