OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output Check for Samples: LM3700, LM3701 FEATURES 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. 1 2 • • • • • • • • • Standard Reset Threshold Voltage: 3.08V Custom Reset Threshold Voltages: For Other Voltages between 2.2V and 5.0V in 10mV Increments, Contact Texas Instruments. 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 µA VCC Supply Current Built-in features include the following: Reset: Reset is asserted during power-up, powerdown, and brownout conditions. RESET is specified 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. APPLICATIONS • • • • Embedded Controllers and Processors Intelligent Instruments Automotive Systems Critical µP Power Monitoring Typical Application VIN VCC VCC Reset Reset PP LLO GND INT GND 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2000–2013, Texas Instruments Incorporated OBSOLETE LM3700, LM3701 SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 www.ti.com Connection Diagram 1 Reset VCC NC NC NC NC LLO GND NC C B A 2 3 Figure 1. Top View (looking from the coating side) micro SMD 9 Bump Package BPA09 Table 1. 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 (LowLine Output Threshold). This output can be used to generate an NMI (Non-Maskable Interrupt) to provide an early warning of imminent power-failure. B3 GND Ground reference for all signals. A1, A2, A3, C2 NC No Connect. B2 NC No Connect. Test input used at factory only. Leave floating. Block Diagram VCC Reset Comparator + - RESET/RESET Reset Logic & One-Shot Timer Low Line Comparator + - LLO 1.225V Reference 2 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 Table 2. Table Of Functions Part Number LM3700 Active Low Reset Output (X = totem-pole) (Y = open-drain) x LM3701 (1) Active High Reset Reset Timeout Period Low Line Output X, Y (1) Customized x X Customized x x = available upon request. Contact TI These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) (2) −0.3V to 6.0V Supply Voltage (VCC) −0.3V to VCC + 0.3V All Other Inputs ESD Ratings (3) Human Body Model 1.5kV Machine Model 150V See (4) Power Dissipation (1) (2) (3) (4) 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 ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed conditions. If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications. The Human Body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using: spacer Where the value of θJ-A for the micro SMD package is 220°C/W. OPERATING RATINGS (1) −40°C ≤ TJ ≤ 85°C Temperature Range (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 ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed conditions. LM3700/LM3701 SERIES ELECTRICAL CHARACTERISTICS Limits in the standard typeface are for TJ = 25°C 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 µA VRST +0.5 +2 % RESET THRESHOLD VRST Reset Threshold −0.5 −2 VCC falling VCC falling: TA = 0°C to 70°C VRSTH tRP tRD −1.5 Reset Threshold Hysteresis Reset Timeout Period VCCto Reset Delay +1.5 0.0032•VRST Reset Reset Reset Reset Timeout Timeout Timeout Timeout Period Period Period Period =A =B =C =D VCC falling at 1mV/µs 1 20 140 1120 1.4 28 200 1600 mV 2 40 280 2240 20 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 ms µs 3 OBSOLETE LM3700, LM3701 SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 www.ti.com LM3700/LM3701 SERIES ELECTRICAL CHARACTERISTICS (continued) Limits in the standard typeface are for TJ = 25°C 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 RESET (LM3701) VOL RESET VOH RESET ILKG Output Leakage Current VCC > 2.25V, ISINK = 900µA 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA 0.4 VCC > 1.2V, ISOURCE = 50µA 0.8 VCC VCC > 1.8V, ISOURCE = 150µA 0.8 VCC VCC > 2.25V, ISOURCE = 300µA 0.8 VCC VCC > 2.7V, ISOURCE = 500µA 0.8 VCC VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V V V VRESET = 5.5V 1.0 VCC > 1.0V, ISINK = 50µA 0.3 VCC > 1.2V, ISINK = 100µA 0.3 VCC > 2.25V, ISINK = 900µA 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA 0.4 µA RESET (LM3700) VOL RESET VOH RESET VCC > 2.25V, ISOURCE = 300µA 0.8 VCC VCC > 2.7V, ISOURCE = 500µA 0.8 VCC VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V V LLO VOL LLO Output Voltage VCC > 2.25V, ISINK = 900µA 0.3 VCC > 2.7V, ISINK = 1.2mA 0.3 VCC > 4.5V, ISINK = 3.2mA VOH 0.4 VCC > 2.25V, ISOURCE = 300µA 0.8 VCC VCC > 2.7V, ISOURCE = 500µA 0.8 VCC VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V V LLO OUTPUT VLLOT LLO Output Threshold (VLLO − VRST, VCC falling) VLLOTH Low-Line Comparator Hysteresis tCD 4 Low-Line Comparator Delay 1.01•VRST VCC falling at 1mV/µs Submit Documentation Feedback 1.02•VRST 1.03•VRST V 0.0032•VRST mV 20 µs Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 3.3V Supply Current vs Temperature 30 30 29 Supply Current (PA) Supply Current (PA) 25 20 15 10 27 26 25 24 5 0 1 28 2 3 4 Supply Voltage (V) 23 -40 5 0 25 70 Temperature (°C) Figure 2. Figure 3. Normalized Reset Threshold Voltage vs Temperature Reset Timeout Period vs VCC 220 0.4 215 0.3 Reset Timeout Period (ms) Normalized Threshold Voltage (%) 0.5 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -40 25 Temperature (°C) 210 205 200 195 190 185 180 3.0 85 3.5 4 4.5 5 5.5 6 Supply Voltage (V) Figure 4. Figure 5. Reset Timeout Period vs Temperature Max. Transient Duration vs Reset Comparator Overdrive (VCC = 3.3V) 215 80 Maximum Transient Duration (Ps) Reset Timeout Period (ms) 85 210 205 200 195 190 -40 70 60 50 40 30 20 10 0 25 85 10 Temperature (°C) 100 1000 Reset Comparator Overdrive (mV) VRST - VCC Figure 6. Figure 7. Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 5 OBSOLETE LM3700, LM3701 SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Low-Line Comparator Propagation Delay vs Temperature 39 Propagation Delay (Ps) 37 35 33 31 29 27 25 -40 -20 0 20 40 60 80 Temperature (oC) Figure 8. 6 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 CIRCUIT INFORMATION RESET OUTPUT The Reset input of a µP 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 ensured 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. 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 TI for details. LOW-LINE OUTPUT (LLO) The low-line output comparator is typically used to provide a non-maskable interrupt to a µP when VCC begins falling. LLO monitors VCC and goes low when VCC falls below VLLOT (typically 1.02 • VRST) with hysteresis of 0.0032 • VRST. 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 TI Application Note AN1112. 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. Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 7 OBSOLETE LM3700, LM3701 SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 www.ti.com Timing Diagrams Figure 9. LM3700 Reset Time Figure 10. LLO Output 8 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 Typical Application Circuits VOUT VIN C VCC RESET R GND VRSTH VIN VOUT RESET tRP Figure 11. LM3701 Power-On Delay Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 9 OBSOLETE LM3700, LM3701 SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 www.ti.com IN VIN VOUT OUT + LM2941 SD GND 24.9k 2.2PF ADJ 7.15k 14.7k 11.5k VOUT = 3.3V VCC VIN(TRIP) = 5.0V RESET 5V 4V VIN 3.3V VOUT RESET tRP Figure 12. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear Regulator 10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 OBSOLETE LM3700, LM3701 www.ti.com SNVS146E – NOVEMBER 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision D ( April 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ............................................................................................................ 9 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3700 LM3701 11 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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