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LM3711

更新时间： 2024-09-16 22:51:51
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美国国家半导体 - NSC 微处理器监控
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16页 317K
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Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset and Watchdog Timer

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June 2002  
LM3710/LM3711  
Microprocessor Supervisory Circuits with Power Fail  
Input, Low Line Output, Manual Reset and Watchdog  
Timer  
General Description  
Features  
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.  
The LM3710/LM3711 series of microprocessor supervisory  
circuits provide the maximum flexibility for monitoring power  
supplies and battery controlled functions in systems without  
backup batteries. The LM3710/LM3711 series are available  
in MSOP-10 and 9-bump micro SMD packages.  
n No external components required  
Built-in features include the following:  
n Manual-Reset input  
n RESET (LM3710) or RESET (LM3711) outputs  
n Precision supply voltage monitor  
n Factory programmable Reset and Watchdog Timeout  
Delays  
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.  
n Separate Power Fail comparator  
n Available in micro SMD package for minimum footprint  
Power-Fail Input: A 1.225V threshold detector for power fail  
warning, or to monitor a power supply other than VCC  
.
n
n
0.5% Reset threshold accuracy at room temperature  
2% Reset threshold accuracy over temperature  
extremes  
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.  
n Reset assertion down to 1V VCC (RESET option only)  
n 28 µA VCC supply current  
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, reset is activated.  
Applications  
n Embedded Controllers and Processors  
n Intelligent Instruments  
n Automotive Systems  
n Critical µP Power Monitoring  
Typical Application  
20011803  
© 2002 National Semiconductor Corporation  
DS200118  
www.national.com  
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 		Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset a
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