June 2002
LM3700/LM3701
Microprocessor Supervisory Circuit with Low Line
Output
n No external components required
n RESET (LM3700) or RESET (LM3701) outputs
n Precision supply voltage monitor
n Factory programmable Reset Timeout Delay
n Available in micro SMD package for minimum footprint
General Description
The LM3700/LM3701 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3700/LM3701 series are available
in a 9-bump micro SMD package.
n
n
0.5% Reset threshold accuracy at room temperature
2% Reset threshold accuracy over temperature
extremes
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.
n Reset assertion down to 1V VCC (RESET option only)
n 28 µA VCC supply current
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
n Embedded Controllers and Processors
n Intelligent Instruments
Features
n Automotive Systems
n Critical µP Power Monitoring
n Standard Reset Threshold voltage: 3.08V
n Custom Reset Threshold voltages: For other voltages
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
Typical Application
20011403
© 2002 National Semiconductor Corporation
DS200114
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