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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# (LM3704) or RESET (LM3705) outputs
Precision supply voltage monitor
Factory programmable Reset Timeout Delay
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 (RESET# option only)
28 µA VCC supply current
Description The LM3704/LM3705 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3704/LM3705 series are available in MSOP-10 and 9-bump micro SMD packages.
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.
Low Line Output: This early power failure warning indicator goes low when the supply voltage drops to a value which is 2% higher than the reset threshold voltage.
Applications
Embedded Controllers and Processors
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
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