DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit General Description Features The AAT352x series of PowerManager products is part of Skyworks' Total Power Management IC (TPMIC™) 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 AAT352x 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 AAT352x product series is guaranteed to operate down to 1.2V and is designed to ignore fast line transients appearing on VCC. The AAT352x series is available with two output stage versions: AAT3522 push-pull active low output; and AAT3524 open drain active low output. The quiescent supply current is extremely low, typically 1µA, making it ideal for portable battery-operated equipment. • Input Voltage Range: 1.2V to 5.5V • Operation Down to 1.2V • Extremely Low Quiescent Current: <2µA • 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 <20µs • Available Output Configurations: ▪ Open-Drain Output ▪ CMOS Active High Output ▪ CMOS Active Low Output • Temperature Range: -40°C to +85°C • 3-Pin SOT23 Package • 4kV ESD Rating The AAT3522/3524 are available in a Pb-free, 3-pin SOT23 package and are specified over the -40°C to +85°C operating temperature range. Applications • Cell Phones • Embedded Systems • Intelligent Instruments • Notebook Computers • Portable Electronics Typical Application VCC VCC AAT3522 AAT3524 RESET (RESET) GND VCC * 100kΩ (nominal) RESET µP INPUT GND *AAT3524 Only Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 1 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Pin Descriptions Pin # Symbol 1 GND RESET (AAT3522, AAT3524) 2 3 VCC Function Ground connection. 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 AAT3522 AAT3524 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 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Absolute Maximum Ratings1 TA = 25°C, 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/µs °C °C Thermal Information2 Symbol QJA 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 3 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Electrical Characteristics VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C; 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 DVTH/°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 IDOFF 4 Description RESET High Output Voltage AAT3522 RESET Leakage Current AAT3524 Conditions TA = 0ºC to +70ºC TA = -40ºC to +85ºC VCC = 5.5V VCC = 3V TA = 25ºC TA = -40ºC to +85ºC 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 = 800µA, VTH > 3.08V, VCC > VTH (max) ISOURCE = 500µA, VTH ≤ 3.08V, VCC > VTH (max) VCC > VTH 30 150 300 15 50 250 500 Units V µA V ppm/°C µs 100 400 800 ms 0.3 V 0.4 VCC -1.5 0.8 VCC V 1 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 µA DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Typical Characteristics Normalized Reset Threshold vs. Temperature Supply Current vs. Temperature 1.20 1.003 VCC = 5V Normalized Threshold Supply Current (µA) 1.40 1.00 0.80 VCC = 3V 0.60 0.40 0.20 0.00 -40 -20 0 20 40 60 80 1.002 1.001 1.000 0.999 0.998 0.997 -40 Temperature (°C) -20 0 -40 -20 0 20 40 60 80 40 60 80 Power-Down Reset Propagation Delay vs. Temperature Reset Propagation Delay (µs) Normalized Power-Up Reset Timeout (ms) 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 Temperature (°C) 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 (µs) 400 350 300 250 200 150 100 50 0 1 10 100 Reset Threshold Overdrive, VTH - VCC (mV) 1000 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 5 DATA SHEET AAT3522/3524 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 AAT352x series of microprocessor reset devices monitor the supply voltage to a microprocessor VCC RESET VTH VTH tRDY and assert a reset signal whenever the VCC voltage falls below a factory-programmed threshold. This threshold is accurate within ±1.5% at 25ºC 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 Figure 1: Reset Timing Diagram (AAT3522, AAT3524). 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Applications Information Supply Voltage Transient Behavior Reset Output Options The AAT3524 has an active low open drain output and the AAT3522 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 brown-out condition, the reset signal remains valid until the VCC drops below 1.2V. To ensure validity down to ground, an external 100kW 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 AAT352x 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 50ms to cause a reset). Immunity can be increased by the addition of a small bypass capacitor of 0.1µF connected as closely to the VCC pin as possible. VCC VCC AAT3522 AAT3524 0.1µF VCC * RESET (RESET) 100kΩ (nominal) RESET µP INPUT GND GND *AAT3524 Only Figure 2: Using Recommended Bypass Capacitor. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 7 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit +3.3V +5.0V VCC VCC 100kΩ AAT3524 RESET GND RESET INPUT 5V System GND Figure 3: Using AAT3524 Open Drain Output with Multiple Supplies. 8 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Factory Trimmed Reset Thresholds1 and Ordering Information Reset Threshold Voltage, VTH (V) Ordering Part Number2 Marking3 Minimum Reset Active (ms) AAT3522IGY-2.20-200-T1 AAT3522IGY-2.32-200-T1 AAT3522IGY-2.45-200-T1 AAT3522IGY-2.63-200-T1 AAT3524IGY-2.63-200-T1 AAT3522IGY-2.93-50-T1 AAT3522IGY-2.93-200-T1 AAT3524IGY-2.93-200-T1 AAT3522IGY-3.08-50-T1 AAT3522IGY-3.08-200-T1 AAT3524IGY-3.08-200-T1 AAT3524IGY-3.08-400-T1 AAT3522IGY-4.38-200-T1 AAT3524IGY-4.38-200-T1 AAT3522IGY-4.63-200-T1 AAT3524IGY-4.63-200-T1 DBXYY DTXYY DXXYY CAXYY CWXYY FVXYY CCXYY FPXYY CYXYY CBXYY BGXYY J7XYY FUXYY IVXYY DAXYY DUXYY 150 150 150 150 150 30 150 150 30 150 150 300 150 150 150 150 TA = -40°C to +85°C TA = 25°C Min Typ Max Min Max 2.167 2.285 2.413 2.200 2.320 2.450 2.233 2.355 2.487 2.145 2.262 2.389 2.255 2.378 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012 9 DATA SHEET AAT3522/3524 MicroPowerTM Microprocessor Reset Circuit Package Information SOT23-3 2.37 ± 0.27 1.30 ± 0.10 2.92 ± 0.12 0.95 BSC 0.40 ± 0.10 ´3 0.50 ± 0.10 0.54 REF 0.14 ± 0.06 4˚± 4˚ 0.96 ± 0.21 0.86 ± 0.16 0.075 ± 0.075 1.90 BSC All dimensions in millimeters. Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202244B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • October 30, 2012