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LM3705

National Semiconductor
Part Number LM3705
Manufacturer National Semiconductor
Description Microprocessor Supervisor
Published Mar 22, 2005
Detailed Description LM3704/LM3705 Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset July 2002 LM...
Datasheet PDF File LM3705 PDF File

LM3705
LM3705

Overview
LM3704/LM3705 Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output and Manual Reset July 2002 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 VCC 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 VCC.
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 n n n n n n n n No external components required Manual-Reset input RESET (LM3704) or RESET (LM3705) outputs Precision supply voltage monitor Factory programmable Reset Timeout Delay Separate Power Fail comparator Available in micro SMD package for minimum footprint ± 0.
5% Reset threshold accuracy at room temperature ± 2% Reset threshold accuracy over temperature extremes n Reset assertion down to 1V VCC (RESET option only) n 28 µA VCC supply current Applications n n n n Embedded Controllers and Processors Intelligent Instruments Automotive Systems Critical µP Power Monitoring 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.
Typical Application 10136903 © 2002 National Semiconductor Corporation DS101369 www.
national.
com LM3704/LM3705 Connection Diagram Top View (looking from the coating side) micro SMD 9 Bump Package B...


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