Features Standard Reset Threshold voltage: 3.08V Custom Reset Threshold voltages: For other voltages between 2.2V and 5.0V in 10mV increments, contact National Semiconductor Corp. No external components required RESET# (LM3706) or RESET (LM3707) outputs Precision supply voltage monitor Factory programmable Reset and Watchdog Timeout Delays Available in micro SMD package for minimum footprint ±0.5% Reset threshold accuracy at room temperature ±2% Reset threshold accuracy over temperature extremes Reset assertion down to 1V VCC (RESET# option only) 28 µA VCC supply current Description The LM3706/LM3707 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3706/LM3707 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 VCC of 1.0V. 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. 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 Embedded Controllers and Processors Intelligent Instruments Automotive Systems Critical µP Power Monitoring

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3707 Microprocessor Supervisory Circuits with Low Line Output and Watchdog Timer	217 Kbytes	1-Jul-02