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AAT3520IGY-4.38-200-T1 Datasheet(PDF) 6 Page - Advanced Analog Technology, Inc. |
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AAT3520IGY-4.38-200-T1 Datasheet(HTML) 6 Page - Advanced Analog Technology, Inc. |
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6 / 9 page  AAT3520/2/4 MicroPower™ Microprocessor Reset Circuit 6 3520.2006.03.1.2 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 micro- processor and assert a reset signal whenever the V CC 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 (t RDY) after VCC has risen above the threshold, as shown in Figure 1. See Ordering Information for available RESET active timeout periods Functional Block Diagram Reset Generator + Timer Oscillator VCC GND RESET (RESET) VREF Figure 1: Reset Timing Diagram (AAT3522, AAT3524). V RESET CC V TH V TH V TH t RDY t RDY |
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