PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit General Description Features The AAT3520 series of PowerManager products is part of AnalogicTech's Total Power Management ICTM (TPMICTM) product family. These microprocessor reset circuits are ideal for monitoring voltage supplies in portable systems, where extended battery life is critical. They provide a low-cost, reliable solution by eliminating the need for external components. The AAT3520 series operates by monitoring the system power supply voltage. When the input voltage drops below a fixed threshold, the device asserts a reset signal for a fixed time period after VCC has risen back above the fixed threshold; 30ms and 150ms minimum periods are available. The AAT3520 product series is guaranteed to operate down to 1.2V and is designed to ignore fast line transients appearing on VCC. The AAT3520 series is available with three output stage versions: AAT3520 push-pull active high output; AAT3522 push-pull active low output; and AAT3524 open drain active low output. The quiescent supply current is extremely low, typically 1A, making it ideal for portable battery-operated equipment. * * * * * * * The AAT3520/2/4 are available in a Pb-free, 3-pin SOT23 package and are specified over the -40C to +85C operating temperature range. * * * * Input Voltage Range: 1.2V to 5.5V Operation Down to 1.2V Extremely Low Quiescent Current: <2A High Accuracy Detection Threshold: 1.5% Monitor Power Supply Voltages Fixed Thresholds from 2.2V to 4.6V -Reset Pulse Width Options Minimum 30ms or 150ms or 300ms Fast Propagation Delay <20s Available Output Configurations: Open-Drain Output CMOS Active High Output CMOS Active Low Output Temperature Range: -40C to +85C 3-Pin SOT23 Package 4kV ESD Rating Applications * * * * * Cell Phones Embedded Systems Intelligent Instruments Notebook Computers Portable Electronics Typical Application VCC VCC VCC * 100k (nominal) AAT3520 AAT3522 RESET AAT3524 (RESET) GND RESET P INPUT GND *AAT3524 Only 3520.2010.03.1.4 www.analogictech.com 1 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Pin Descriptions Pin # Symbol 1 GND RESET (AAT3520) RESET (AAT3522, AAT3524) 2 3 VCC Function Ground connection. RESET output remains high while VCC is below the reset threshold and remains so for a fixed time period after VCC raises above the reset threshold. RESET output remains low while VCC is below the reset threshold and remains so for a fixed time period after VCC raises above the reset threshold. Supply voltage (+1.2V to +5.5V). Due to extremely low operating current, place a 10nF capacitor between VCC and GND. Part Number Descriptions Part Number Part Description AAT3520 AAT3522 AAT3524 Reset Output Push Pull Active High with Delay Reset Output Push Pull Active Low with Delay Reset Output Open Drain Active Low with Delay Pin Configuration SOT23-3 (Top View) GND 1 3 (RESET) RESET 2 VCC 2 www.analogictech.com 3520.2010.03.1.4 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Absolute Maximum Ratings1 TA = 25C, unless otherwise noted. Symbol VCC VRESET IMAX IRESET dVCC/dt TJ TLEAD Description VCC to GND RESET to GND (Push-Pull Output) RESET to GND (Open Drain Output) Maximum Continuous Input Current RESET/RESET Current Rate of Rise of VCC Operating Junction Temperature Range Maximum Soldering Temperature (at Leads, 10 sec.) Value Units -0.3 to 5.5 -0.3 to VCC + 0.3 -0.3 to 5.5 20 20 100 -40 to 150 300 V V mA mA V/s C C Thermal Information2 Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation Value Units 200 320 C/W mW 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. 3520.2010.03.1.4 www.analogictech.com 3 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Electrical Characteristics VIN = 5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = 25C; VCC = 5V for 4.63/4.38V versions; VCC = 3.3V for 3.08/2.93V versions; VCC = 3.0V for 2.63V version; VCC = 2.5V for 2.32/2.2V versions. Symbol VCC Operation Voltage IQ Quiescent Current VTH VTH/C tP RESET Threshold (Table 1) RESET Threshold Temperature Coefficient RESET Propagation Delay tRDY RESET Active Timeout Period VOL RESET Low Output Voltage AAT3522, AAT3524 VOH RESET High Output Voltage AAT3522 VOL RESET Low Output Voltage AAT3520 VOH IDOFF 4 Description RESET High Output Voltage AAT3520 RESET Leakage Current AAT3524 Conditions TA = 0C to +70C TA = -40C to +85C VCC = 5.5V VCC = 3V TA = 25C TA = -40C to +85C Min Typ Max 1.05 0.85 VTH VTH 5.5 5.5 3 2 + 1.5% + 2.5% 1.0 1.2 VTH - 1.5% VTH - 2.5% VTH VTH 40 VCC = VTH to (VTH - 100mV) -50 Option -200 Option -400 Option ISINK = 1.2mA, VCC = VTH(min), VTH 3.08V, RESET Asserted ISINK = 3.2mA, VCC = VTH(min), VTH > 3.08V, RESET Asserted ISOURCE = 800A, VTH > 3.08V, VCC > VTH (max) ISOURCE = 500A, VTH 3.08V, VCC > VTH (max) ISINK = 1.2mA, VCC > VTH (max), VTH 3.08V, RESET Not Asserted ISINK = 3.2mA, VCC > VTH (max), VTH > 3.08V, RESET Not Asserted ISOURCE = 500A, VCC > 2.1V, RESET Asserted ISOURCE = 50A, VCC > 1.2V, RESET Asserted VCC > VTH 30 150 300 15 50 250 500 V A V ppm/C s 100 400 800 ms 0.3 V 0.4 VCC -1.5 0.8 VCC V 0.3 V 0.4 0.8VCC 0.8VCC V 1 www.analogictech.com Units A 3520.2010.03.1.4 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Typical Characteristics Supply Current vs. Temperature Normalized Reset Threshold vs. Temperature 1.003 VCC = 5V 1.20 Normalized Threshold Supply Current (A) 1.40 1.00 0.80 VCC = 3V 0.60 0.40 0.20 0.00 -40 -20 0 20 40 60 1.002 1.001 1.000 0.999 0.998 0.997 80 -40 Temperature (C) -20 0 20 40 60 Normalized Power-Up Reset Timeout (ms) 20 40 60 80 Power-Down Reset Propagation Delay vs. Temperature 80 Reset Propagation Delay (s) -40 0 Temperature (C) Normalized Power-Up Reset Timeout vs. Temperature 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 -20 100 Temperature (C) 30 25 VOD = 10mV 20 15 10 VOD = 100mV 5 0 -40 -20 0 20 40 60 80 Temperature (C) Maximum Transient Duration vs. Reset Threshold Overdrive Maximum Transient Duration (s) 400 350 300 250 200 150 100 50 0 1 10 100 1000 Reset Threshold Overdrive, VTH - VCC (mV) 3520.2010.03.1.4 www.analogictech.com 5 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Functional Block Diagram VCC Reset Generator + Timer RESET (RESET) Oscillator VREF GND Functional Description General During start-up, the reset pin on a microprocessor ensures that it is fully reset and starts up in a known condition. The AAT3520 series of microprocessor reset devices monitor the supply voltage to a microprocessor VCC RESET VTH and assert a reset signal whenever the VCC voltage falls below a factory-programmed threshold. This threshold is accurate within 1.5% at 25C and within 2.5% over the entire operating temperature range. The reset signal remains asserted for a fixed time period (tRDY) after VCC has risen above the threshold, as shown in Figure 1. See Ordering Information for available RESET active timeout periods. VTH tRDY VTH tRDY Figure 1: Reset Timing Diagram (AAT3522, AAT3524). 6 www.analogictech.com 3520.2010.03.1.4 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Applications Information Supply Voltage Transient Behavior Reset Output Options The AAT3524 has an active low open drain output and the AAT3520/2 have a push-pull output. The AAT3524 may be used in multiple voltage systems with an external pull-up resistor. This allows the AAT3524 to interface to microprocessors with higher supply voltages up to 5.5V (Figure 3). In the event of a power down or brownout condition, the reset signal remains valid until the VCC drops below 1.2V. To ensure validity down to ground, an external 100k resistor should be connected between the RESET output and GND. In some cases, fast negative transients of short duration can appear on the VCC power supply. The AAT3520 series devices provide some immunity to line transients which can generate invalid reset pulses. Figure 1 shows typical behavior to short duration pulses versus RESET comparator overdrive. As shown in the Maximum Transient Duration vs. Reset Threshold Overdrive graph, when the transient voltage becomes larger, the time allowed before asserting a reset becomes shorter (i.e., typically a transient of 100mV below the reset threshold would have to present for more than 50s to cause a reset). Immunity can be increased by the addition of a small bypass capacitor of 0.1F connected as closely to the VCC pin as possible. VCC VCC VCC * 100k (nominal) 0.1F AAT3520 AAT3522 RESET AAT3524 (RESET) RESET P INPUT GND GND *AAT3524 Only Figure 2: Using Recommended Bypass Capacitor. 3520.2010.03.1.4 www.analogictech.com 7 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit +3.3V +5.0V VCC VCC 100k AAT3524 RESET RESET INPUT GND 5V System GND Figure 3: Using AAT3524 Open Drain Output with Multiple Supplies. 8 www.analogictech.com 3520.2010.03.1.4 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Factory Trimmed Reset Thresholds1 and Ordering Information Reset Threshold Voltage, VTH (V) Ordering Part Number2 AAT3522IGY-2.20-200-T1 AAT3520IGY-2.32-200-T1 AAT3522IGY-2.32-200-T1 AAT3524IGY-2.32-200-T1 AAT3522IGY-2.45-200-T1 AAT3520IGY-2.63-200-T1 AAT3522IGY-2.63-200-T1 AAT3524IGY-2.63-200-T1 AAT3520IGY-2.93-200-T1 AAT3522IGY-2.93-50-T1 AAT3522IGY-2.93-200-T1 AAT3524IGY-2.93-200-T1 AAT3520IGY-3.08-50-T1 AAT3520IGY-3.08-200-T1 AAT3522IGY-3.08-50-T1 AAT3522IGY-3.08-200-T1 AAT3524IGY-3.08-200-T1 AAT3524IGY-3.08-400-T1 Marking3 Minimum Reset Active (ms) DBXYY DTXYY DXXYY GNXYY CAXYY CWXYY CZXYY FVXYY CCXYY FPXYY EFXYY CNXYY CYXYY CBXYY BGXYY J7XYY AAT3520IGY-4.38-200-T1 AAT3522IGY-4.38-200-T1 AAT3524IGY-4.38-200-T1 FUXYY IVXYY AAT3520IGY-4.63-200-T1 AAT3522IGY-4.63-200-T1 AAT3524IGY-4.63-200-T1 HKXYY DAXYY DUXYY 150 150 150 150 150 150 150 150 150 30 150 150 30 150 30 150 150 300 150 150 150 150 150 150 TA = -40C to +85C TA = 25C Min Typ Max Min Max 2.167 2.200 2.233 2.145 2.255 2.285 2.320 2.355 2.262 2.378 2.413 2.450 2.487 2.389 2.511 2.591 2.630 2.669 2.564 2.696 2.886 2.930 2.974 2.857 3.003 3.034 3.080 3.126 3.003 3.157 4.314 4.380 4.446 4.271 4.490 4.561 4.630 4.699 4.514 4.746 1. Contact Local Sales Office for custom trimmed options. 2. Sample stock is generally held on part numbers listed in BOLD. 3. XYY = assembly and date code. 3520.2010.03.1.4 www.analogictech.com 9 PRODUCT DATASHEET AAT3520/2/4 PowerManagerTM MicroPowerTM Microprocessor Reset Circuit Package Information SOT23-3 2.37 0.27 1.30 0.10 2.92 0.12 0.95 BSC 4 4 0.14 0.06 0.96 0.21 0.86 0.16 0.075 0.075 1.90 BSC 0.50 0.10 0.40 0.10 x 3 0.54 REF All dimensions in millimeters. Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 (c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 10 www.analogictech.com 3520.2010.03.1.4