AAT3528ICX-2.93-200-T1

AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset General Description The AAT3526/7/8 PowerManager products are members of AnalogicTech's 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 reliable, lowcost solution by eliminating external components. The AAT3526/7/8 products operate by monitoring the system power supply voltage. When the input voltage drops below a fixed threshold, the device asserts a reset signal for a minimum of 150ms after VCC has risen back above the fixed threshold. They are guaranteed to operate down to 1.2V and designed to ignore fast line transients appearing on VCC. The AAT3526/7/8 series is available with three output stage versions: AAT3526 push-pull active low output; AAT3527 push-pull active high output; and AAT3528 open drain active low output. The quiescent supply current is extremely low, typically 1µA, making this device ideal for portable batteryoperated equipment. AAT3526/7/8 devices are available in a Pb-free, 4-pin SOT143 package and are specified over the -40°C to +85°C operating temperature range. Features • • • • • • • • • PowerManager™ • • • Input Voltage Range: 1.2V to 5.5V Operation Down to 1.2V Extremely Low Quiescent Current: Less Than 2µA High Accuracy Detection Threshold: ±1.5% Monitor Power Supply Voltages Fixed Thresholds From 2.2V to 4.6V Minimum 150ms Reset Pulse Width With Fast Delay Time 3.08V, RESET Asserted ISOURCE = 800µA, VTH > 3.08V, RESET High Output Voltage VCC > VTH (max) AAT3526 ISOURCE = 500µA, VTH ≤ 3.08V, VCC > VTH (max) ISINK = 1.2mA, VCC > VTH (max) RESET Low Output Voltage VTH ≤ 3.08V, RESET Not Asserted AAT3527 ISINK = 3.2mA, VCC > VTH (max) VTH > 3.08V, RESET Not Asserted ISOURCE = 500µA, VCC > 2.1V, RESET High Output Voltage RESET Asserted AAT3527 ISOURCE = 50µA, VCC > 1.2V, RESET Asserted RESET Leakage Current, VCC > VTH AAT3528 5.5 V 5.5 1.05 3 µA 0.85 2 VTH - 1.5% VTH VTH + 1.5% V VTH - 2.5% VTH VTH + 2.5% 40 ppm/°C 15 µs 150 250 400 ms 10 µs 100 ns 0.5 µs 2.3 V 0.7 × VCC 0.8 V 0.25 × VCC 30 65 90 kΩ 0.3 V 0.4 VCC - 1.5 V 0.8 VCC 0.3 V 0.4 0.8VCC V 0.8VCC 1 µA 1. See Ordering Information for factory-trimmed reset thresholds. 4 3526.2006.03.1.6 AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset Typical Characteristics Supply Current vs. Temperature 1.40 Normalized Reset Threshold vs. Temperature Normalized Threshold 1.003 1.002 1.001 1.000 0.999 0.998 0.997 -40 -20 0 20 40 60 80 Supply Current (µA) 1.20 1.00 0.80 0.60 0.40 0.20 0.00 -40 -20 VCC = 5V VCC = 3V 0 20 40 60 80 Temperature (°C) Temperature (°C) Power-Up Reset Timeout vs. Temperature 320 300 Power-Down Reset Propagation Delay vs. Temperature Reset Propagation Delay (µs) 30 25 20 15 10 5 0 -40 Power-Up Reset Timeout (ms) VOD = 10mV 280 260 240 220 200 180 160 -40 -20 0 20 40 60 80 100 VOD = 100mV -20 0 20 40 60 80 Temperature (°C) Temperature (°C) Maximum Transient Duration vs. Reset Threshold Overdrive 400 Maximum Transient Duration (µs) 350 300 250 200 150 100 50 0 1 10 100 1000 Reset Threshold Overdrive, VTH - VCC (mV) 3526.2006.03.1.6 5 AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset Functional Block Diagram MR 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 AAT3526/7/8 series of microprocessor reset devices monitor the supply voltage to a microprocessor 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 minimum of 150ms after VCC has risen above the threshold, as shown in Figure 1. VTH VCC VTH VTH tRDY tRDY Figure 1: Reset Timing Diagram. 6 3526.2006.03.1.6 AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset Applications Information Reset Output Options The AAT3528 has an active low open drain output and the AAT3526/7 have a push-pull output. The AAT3528 may be used in multiple voltage systems with an external pull-up resistor. This allows the AAT3528 to interface to microprocessors with higher supply voltages up to 5.5V (Figure 2). 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 100kΩ resistor should be connected between the RESET output and GND. MR input is internally debounced which allows the use of a mechanical switch. It should be a normallyopen momentary switch connected from MR to GND. Additionally, the MR pin can be driven from TTL, CMOS, or open drain logic outputs. Supply Voltage Transient Behavior In some cases, fast negative transients of short duration can appear on the VCC power supply. The AAT3526/7/8 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 (e.g., typically a transient of 100mV below the reset threshold would have to present for more than 50µs to cause a reset). Immunity can be increased by the addition of a small bypass capacitor of 0.1µF connected as close to the VCC pin as possible. Manual Reset Input A logic low signal on MR asserts a reset condition. Reset continues to be asserted as long as MR is low and for a minimum of 150ms after MR returns high. This input is internally pulled up to VCC via a 65kΩ resistor, so leaving the pin unconnected is acceptable if the manual reset function is not needed. The VCC VCC * 100k (nominal) VCC 0.1µF MR AAT3526 AAT3527 RESET (RESET) AAT3528 RESET µP INPUT GND GND *AAT3528 Only Figure 2: Using Recommended Bypass Capacitor. +3.3V +5.0V VCC 100k VCC AAT3528 MR RESET RESET INPUT 5V System GND GND Figure 3: Using AAT3528 Open Drain Output with Multiple Supplies. 3526.2006.03.1.6 7 AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset Ordering Information and Factory-Trimmed Reset Thresholds1 Ordering Part Number2 AAT3526ICX-2.32-200-T1 AAT3527ICX-2.32-200-T1 AAT3528ICX-2.32-200-T1 AAT3526ICX-2.63-200-T1 AAT3527ICX-2.63-200-T1 AAT3528ICX-2.63-200-T1 AAT3526ICX-2.93-200-T1 AAT3527ICX-2.93-200-T1 AAT3528ICX-2.93-200-T1 AAT3528ICX-3.00-200-T1 AAT3526ICX-3.08-200-T1 AAT3527ICX-3.08-200-T1 AAT3528ICX-3.08-200-T1 AAT3526ICX-4.38-200-T1 AAT3527ICX-4.38-200-T1 AAT3528ICX-4.38-200-T1 AAT3526ICX-4.63-200-T1 AAT3527ICX-4.63-200-T1 AAT3528ICX-4.63-200-T1 Marking3 NOXYY Reset Threshold Voltage, VTH (V) TA = -40°C to +85°C TA = 25°C Min Typ Max Min Max 2.285 2.320 2.355 2.262 2.378 DNXYY 2.591 DRXYY DOXYY DQXYY FQXYY FIXYY EQXYY FHXYY FJXYY GCXYY HLXYY DPXYY HMXYY 2.886 2.955 3.034 2.930 3.000 3.080 2.974 3.045 3.126 2.857 2.925 3.003 3.003 3.075 3.157 2.630 2.669 2.564 2.696 4.314 4.380 4.446 4.271 4.490 4.561 4.630 4.699 4.514 4.746 All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree. 1. Contact local Sales Office for custom trimmed options. 2. Sample stock is generally held on all part numbers listed in BOLD. 3. XYY = assembly and date code. 8 3526.2006.03.1.6 AAT3526/7/8 MicroPower™ Supervisory Circuit with Manual Reset Package Information SOT143 2.92 ± 0.12 1.92 BSC 2.37 ± 0.27 0.20 BSC 0.40 ± 0.1 × 3 0.925 ± 0.175 1.01 ± 0.21 1.30 ± 0.10 4° ± 4° 0.075 ± 0.075 0.825 ± 0.065 0.69 REF 0.50 ± 0.10 All dimensions in millimeters. © 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. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. 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. Advanced Analogic Technologies, Inc. 830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 3526.2006.03.1.6 0.15 ± 0.07 9