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AAT3520 Datasheet(PDF) 5 Page - Advanced Analogic Technologies

Part No. AAT3520
Description  MicroPower Microprocessor Reset Circuit
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Maker  ANALOGICTECH [Advanced Analogic Technologies]
Homepage  http://www.analogictech.com
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AAT3520 Datasheet(HTML) 5 Page - Advanced Analogic Technologies

   
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AAT3520/2/4
MicroPower Microprocessor Reset Circuit
3520.2002.2.0.9
5
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 operat-
ing 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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