NATIONAL LM3702 LM3703 User's Manual
Summary
These microprocessor supervisory circuits are essential for critical power monitoring in embedded controllers, intelligent instruments, and automotive systems. The LM3702/LM3703 series monitors supply voltage integrity, providing reliable reset signals during power-up, brownouts, or based on manual input. This manual details the functionality, customizable threshold settings (2.2V to 5.0V), and the specialized Low Line Output for early power failure warnings. Engineered in a minimal micro SMD package, these supervisors ensure sustained system stability.
Page 1 Text Content
September
LM 3702/LM icroprocessor upervisory ircuits ith Low Line utput and anual R eset
LM3702/LM3703 Microprocessor Supervisory Circuits with Low Line Output and Manual Reset
No external components required
General Description
Manual-Reset input
The LM3702/LM3703 series of microprocessor supervisory
RESET (LM3702) or RESET (LM3703) outputs
circuits provide the maximum flexibility for monitoring power
Precision supply voltage monitor
supplies and battery controlled functions in systems without
Factory programmable Reset Timeout Delay
backup batteries. The LM3702/LM3703 series are available
in 9-bump micro SMD package. Available in micro SMD package for minimum footprint ±0.5% Reset threshold accuracy at room temperature
Built-in features include the following:
±2% Reset threshold accuracy over temperature
Reset: Reset is asserted during power-up, power-down, and
extremes brownout conditions. RESET is guaranteed down to VCC of Reset assertion down to 1V VCC (RESET option only)
µA VCC supply current
Manual Reset Input: An input that asserts reset when pulled low.
Applications
Low Line Output: This early power failure warning indicator
goes low when the supply voltage drops to value which is Embedded Controllers and Processors
2% higher than the reset threshold voltage. Intelligent Instruments
Automotive Systems Features Critical µP Power Monitoring
Standard Reset Threshold voltage: 3.08V Custom Reset Threshold voltages: For other voltages between 2.2V and 5.0V in 10m V increments, contact National Semiconductor Corp.
Typical Application
National Semiconductor Corporation DS200115 www.national.com
Page Summary Contents For NATIONAL LM3702 LM3703 User's Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 13 |
| File Size | 222.46 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
How do I get an early warning of imminent power failure?
Use the Low-Line Output (C3); it goes low when the supply voltage drops to a value 2% higher than the reset threshold.
Are there limitations on setting custom reset thresholds?
You can request thresholds between 2.2V and 5.0V in 10mV increments, but you must contact National Semiconductor sales office for these customized voltages.
What conditions does the RESET output monitor besides sudden power loss?
The RESET output monitors brownout conditions and is guaranteed down to 1V CC, providing maximum flexibility for monitoring power supplies.
Can this component be used in critical life support or medical device systems?
No, National Semiconductor requires express written approval before these products can be used as critical components in life support devices.