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AAT3526 Datasheet(PDF) 6 Page - Advanced Analogic Technologies

Part No. AAT3526
Description  MicroPower Supervisory Circuit with Manual Reset
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Maker  ANALOGICTECH [Advanced Analogic Technologies]
Homepage  http://www.analogictech.com
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AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
6
3526.2002.1.0.62
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 microproces-
sor reset devices monitor the supply voltage to a
microprocessor 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 minimum of 150ms after V
CC has
risen above the threshold as shown in Figure 1.
Functional Block Diagram
Reset
Generator
+ Timer
Oscillator
VCC
GND
RESET
(RESET)
MR
VREF
Figure 1: Reset Timing Diagram
V
CC
V
TH
V
TH
V
TH
t
RDY
t
RDY




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