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AAT3520IGY-2.32-200-T1 Datasheet(PDF) 7 Page - Advanced Analogic Technologies |
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AAT3520IGY-2.32-200-T1 Datasheet(HTML) 7 Page - Advanced Analogic Technologies |
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7 / 9 page  AAT3520/2/4 MicroPower™ Microprocessor Reset Circuit 3520.2006.03.1.2 7 Applications Information 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 high- er 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 V CC drops below 1.2V. To ensure validity down to ground, an exter- nal 100k Ω resistor should be connected between the RESET output and GND. Supply Voltage Transient Behavior In some cases, fast negative transients of short duration can appear on the V CC power supply. The AAT3520 series devices provide some immunity to line transients which can generate invalid reset puls- es. 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 volt- age becomes larger, the time allowed before assert- ing a reset becomes shorter (i.e., typically a transient of 100mV below the reset threshold would have to present for more than 50 µs to cause a reset). Immunity can be increased by the addition of a small bypass capacitor of 0.1µF connected as closely to the V CC pin as possible. Figure 2: Using Recommended Bypass Capacitor. Figure 3: Using AAT3524 Open Drain Output with Multiple Supplies. AAT3524 5V System +3.3V VCC VCC RESET 100k Ω GND GND RESET INPUT +5.0V *AAT3524 Only AAT3520 AAT3522 AAT3524 µP V 0.1µF CC VCC VCC RESET (RESET) GND GND RESET INPUT 100kΩ (nominal) * |
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