LM3700,LM3701 LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output Literature Number: SNVS146D LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output General Description The LM3700/LM3701 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3700/LM3701 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. Features Standard Reset Threshold voltage: 3.08V Custom Reset Threshold voltages: For other voltages No external components required RESET (LM3700) or RESET (LM3701) outputs Precision supply voltage monitor Factory programmable Reset Timeout Delay 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 A VCC supply current Applications Embedded Controllers and Processors Intelligent Instruments Automotive Systems Critical P Power Monitoring between 2.2V and 5.0V in 10mV increments, contact National Semiconductor Corp. Typical Application 20011403 (c) 2011 National Semiconductor Corporation 200114 200114 Version 5 Revision 3 www.national.com Print Date/Time: 2011/09/24 07:37:25 LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output OBSOLETE September 24, 2011 LM3700/LM3701 Connection Diagram Top View (looking from the coating side) micro SMD 9 Bump Package BPA09 20011401 Pin Descriptions Bump No. Name B1 VCC Function C1 RESET Reset Logic Output. Pulses low for tRP (Reset Timeout Period) when triggered, and stays low whenever VCC is below the reset threshold or when MR is below VMRT. It remains low for tRP after either VCC rises above the reset threshold, or after MR input rises above VMRT (LM3700 only). RESET Reset Logic Output. RESET is the inverse of RESET (LM3701 only). Power Supply input. C3 LLO Low-Line Logic Output. Early Power-Fail warning output. Low when VCC falls below VLLOT (Low-Line Output Threshold). This output can be used to generate an NMI (Non-Maskable Interrupt) to provide an early warning of imminent power-failure. Ground reference for all signals. B3 GND A1, A2, A3, C2 NC No Connect. B2 NC No Connect. Test input used at factory only. Leave floating. www.national.com 2 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 LM3700/LM3701 Block Diagram 20011405 3 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 Ordering Information 20011404 *For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office. LM3700/LM3701 Part Number Output Reset Timeout Period Package Marking LM3700XBBP-270 totem-pole 28ms %%IE LM3700XBBPX-270 totem-pole 28ms %%IE LM3700XCBP-290 totem-pole 200ms %%123 LM3700XCBPX-290 totem-pole 200ms %%123 LM3700XCBP-308 totem-pole 200ms %%I0 LM3700XCBPX-308 totem-pole 200ms %%I0 LM3701XCBP-308 totem-pole 200ms %%I1 LM3701XCBPX-308 totem-pole 200ms %%I1 LM3700XBBP-420 totem-pole 28ms %%IF LM3700XBBPX-420 totem-pole 28ms %%IF %% is the datecode and will vary with time. Table Of Functions Part Number LM3700 Active Low Reset Active High Reset Output (X = totem-pole) (Y = open-drain) x LM3701 x Reset Timeout Period Low Line Output X, Y* Customized x X Customized x * = available upon request. Contact National www.national.com 4 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) All Other Inputs 1.5kV 150V (Note 3) Operating Ratings -0.3V to 6.0V -0.3V to VCC + 0.3V (Note 1) -40C TJ 85C Temperature Range LM3700/LM3701 Series Electrical Characteristics Limits in the standard typeface are for TJ = 25C and limits in boldface type apply over full operating range. Unless otherwise specified: VCC = +2.2V to 5.5V. Symbol Parameter Conditions Min Typ Max Units POWER SUPPLY VCC ICC Operating Voltage Range: VCC LM3700 1.0 5.5 LM3701 1.2 5.5 VCC Supply Current All inputs = VCC; all outputs floating V 28 50 A VRST +0.5 +2 % RESET THRESHOLD VRST Reset Threshold VCC falling -0.5 -2 VCC falling: TA = 0C to 70C VRSTH tRP tRD -1.5 Reset Threshold Hysteresis +1.5 0.0032*VRST Reset Timeout Period Reset Timeout Period = A Reset Timeout Period = B Reset Timeout Period = C Reset Timeout Period = D VCCto Reset Delay VCC falling at 1mV/s 1 20 140 1120 1.4 28 200 1600 mV 2 40 280 2240 20 ms s RESET (LM3701) VOL VOH ILKG RESET RESET Output Leakage Current VCC > 2.25V, ISINK = 900A 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA 0.4 VCC > 1.2V, ISOURCE = 50A 0.8 VCC VCC > 1.8V, ISOURCE = 150A 0.8 VCC VCC > 2.25V, ISOURCE = 300A 0.8 VCC VCC > 2.7V, ISOURCE = 500A 0.8 VCC VCC > 4.5V, ISOURCE = 800A VCC - 1.5V V V VRESET = 5.5V 1.0 VCC > 1.0V, ISINK = 50A 0.3 VCC > 1.2V, ISINK = 100A 0.3 VCC > 2.25V, ISINK = 900A 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA 0.4 A RESET (LM3700) VOL VOH RESET RESET VCC > 2.25V, ISOURCE = 300A 0.8 VCC VCC > 2.7V, ISOURCE = 500A 0.8 VCC VCC > 4.5V, ISOURCE = 800A VCC - 1.5V 5 200114 Version 5 Revision 3 V Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 ESD Ratings (Note 2) Human Body Model Machine Model Power Dissipation Absolute Maximum Ratings (Note 1) LM3700/LM3701 Symbol Parameter Conditions Min Typ Max Units LLO VOL LLO Output Voltage VCC > 2.25V, ISINK = 900A 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA VOH 0.4 VCC > 2.25V, ISOURCE = 300A 0.8 VCC VCC > 2.7V, ISOURCE = 500A 0.8 VCC VCC > 4.5V, ISOURCE = 800A VCC - 1.5V V LLO OUTPUT VLLOT LLO Output Threshold (VLLO - VRST, VCC falling) VLLOTH Low-Line Comparator Hysteresis tCD Low-Line Comparator Delay 1.01*VRST VCC falling at 1mV/s 1.02*VRST 1.03*VRST V 0.0032*VRST mV 20 s Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed conditions. Note 2: The Human Body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using: Where the value of J-A for the micro SMD package is 220C/W. www.national.com 6 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 LM3700/LM3701 Typical Performance Characteristics Supply Current vs Supply Voltage 3.3V Supply Current vs Temperature 20011411 20011415 Normalized Reset Threshold Voltage vs Temperature Reset Timeout Period vs VCC 20011412 20011432 Reset Timeout Period vs Temperature Max. Transient Duration vs Reset Comparator Overdrive (VCC = 3.3V) 20011410 20011416 7 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 Low-Line Comparator Propagation Delay vs Temperature 20011414 www.national.com 8 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 LLO monitors VCC and goes low when VCC falls below VLLOT (typically 1.02 * VRST) with hysteresis of 0.0032 * VRST. RESET OUTPUT The Reset input of a P initializes the device into a known state. The LM3700/LM3701 microprocessor supervisory circuits assert a forced reset output to prevent code execution errors during power-up, power-down, and brownout conditions. RESET is guaranteed valid for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer maintains the output for the reset timeout period. After this interval, reset goes high. The LM3700 offers an active-low RESET; The LM3701 offers an active-high RESET. Any time VCC drops below the reset threshold (such as during a brownout), the reset activates. When VCC again rises above the reset threshold, the internal timer starts. Reset holds until VCC exceeds the reset threshold for longer than the reset timeout period. After this time, reset releases. SPECIAL PRECAUTIONS FOR THE MICRO SMD PACKAGE As with most integrated circuits, the LM3700 and LM3701 are sensitive to exposure from visible and infrared (IR) light radiation. Unlike a plastic encapsulated IC, the micro SMD package has very limited shielding from light, and some sensitivity to light reflected from the surface of the PC board or long wavelength IR entering the die from the side may be experienced. This light could have an unpredictable affect on the electrical performance of the IC. Care should be taken to shield the device from direct exposure to bright visible or IR light during operation. MICRO SMD MOUNTING The micro SMD package requires specific mounting techniques which are detailed in National Semiconductor Application Note AN-1112. Referring to the section Surface Mount Technology (SMT) Assembly Considerations, it should be noted that the pad style which must be used with the 9-pin package is the NSMD (non-solder mask defined) type. For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device. RESET THRESHOLD The LM3700/LM3701 family is available with a reset voltage of 3.08V. Other reset thresholds in the 2.20V to 5.0V range, in steps of 10 mV, are available; contact National Semiconductor for details. LOW-LINE OUTPUT (LLO) The low-line output comparator is typically used to provide a non-maskable interrupt to a P when VCC begins falling. 9 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 Circuit Information LM3700/LM3701 Timing Diagrams 20011428 FIGURE 1. LM3700 Reset Time 20011429 FIGURE 2. LLO Output www.national.com 10 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 LM3700/LM3701 Typical Application Circuits 20011424 FIGURE 3. LM3701 Power-On Delay 11 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 20011422 FIGURE 4. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear Regulator www.national.com 12 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 LM3700/LM3701 Physical Dimensions inches (millimeters) unless otherwise noted NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCKWISE. 5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT. 6.NO JEDEC REGISTRATION AS OF AUG.1999. 9 bump micro SMD Package NS Package Number BPA09FFB The dimensions of X1, X2 and X3 are given below X1 = 1.412mm X2 = 1.412mm X3 = 0.850mm 13 200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25 www.national.com LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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