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LM3704XCMM-308 Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM3704XCMM-308 Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 17 page LM3704/LM3705 Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset General 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 V CC 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 V CC. 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. 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. n No external components required n Manual-Reset input n RESET (LM3704) or RESET (LM3705) outputs n Precision supply voltage monitor n Factory programmable Reset Timeout Delay n Separate Power Fail comparator n Available in micro SMD package for minimum footprint n ± 0.5% Reset threshold accuracy at room temperature n ± 2% Reset threshold accuracy over temperature extremes n Reset assertion down to 1V V CC (RESET option only) n 28 µA V CC supply current Applications n Embedded Controllers and Processors n Intelligent Instruments n Automotive Systems n Critical µP Power Monitoring Typical Application 10136903 July 2002 © 2002 National Semiconductor Corporation DS101369 www.national.com |
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