AAT3526/7/8
MicroPower™ Supervisory Circuit
with Manual Reset
Functional Block Diagram
MR
VCC
Reset
Generator
+ Timer
RESET
(RESET)
Oscillator
V
REF
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 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 operating
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.
V
TH
V
CC
V
TH
V
TH
t
RDY
t
RDY
Figure 1: Reset Timing Diagram.
6
3526.2006.03.1.6
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
