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Features
Standard Reset Threshold voltage: 3.08V
Custom Reset Threshold voltages: For other voltages between 2.2V and 5.0V in 10mV increments, contact National Semiconductor
Corp.
No external components required
Manual-Reset input
^RESET output
Precision supply voltage monitor
Factory programmable Reset and Watchdog Timeout Delays
Separate Watchdog output
Separate Power Fail comparator
Available in micro SMD package for minimum footprint
±0.5% Reset threshold accuracy at room temperature
±2% Reset threshold accuracy over temperature extremes
Reset assertion down to 1V VCC
28 µA VCC supply current
Description The LM3712 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and
battery controlled functions in systems without backup batteries. The LM3712 series are available in a 9-bump micro SMD package.
Built-in features include the following:
Reset: Reset is asserted during power-up, power-down, and brownout conditions.
^RESET is guaranteed down to VCC of 1.0V.
Manual Reset Input: An input that asserts reset when pulled low.
Power-Fail Input: A 1.225V threshold detector for power fail warning, or to monitor a power supply other than VCC.
Watchdog Timer: The WDI (Watchdog Input) monitors one of the µP's output lines for activity. If no output transition occurs
during the watchdog timeout period, the watchdog output (
^WDO) pulls low.
Applications
Embedded Controllers and Processors
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
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