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LM3712 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3712 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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LM3712/LM3713 Microprocessor Supervisory Circuits with Separate Watchdog Timer Output, Power Fail Input and Manual Reset General Description The LM3712/LM3713 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3712/LM3713 series are available in a 9-bump micro SMD package. 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. 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, the watchdog output (WDO) pulls low. 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 (LM3712) or RESET (LM3713) outputs n Precision supply voltage monitor n Factory programmable Reset and Watchdog Timeout Delays n Separate Watchdog output 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 20011903 July 2002 © 2002 National Semiconductor Corporation DS200119 www.national.com |
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