AAT3520/2/4
MicroPower Microprocessor Reset Circuit
General Description
The AAT3520 Series of PowerManager鈩?products
is a member of AATI's Total Power Management
IC鈩?(TPMIC鈩? product family. These micro-
processor reset circuits are ideal for monitoring volt-
age supplies in portable systems, where extended
battery life is critical. They provide a low cost, reli-
able solution by eliminating external components.
The AAT3520 series operates by monitoring the
system power supply voltage. When the input volt-
age drops below a fixed threshold, the device
asserts a reset signal for a fixed time period after
V
CC
has risen back above the fixed threshold; 30ms
and 150ms minimum periods are available. The
AAT3520 product series is guaranteed to operate
down to 1.2V and designed to ignore fast line tran-
sients appearing on V
CC
. The AAT3520 series is
available with three output stage versions: AAT3520
push-pull active high output, AAT3522 push-pull
active low output and AAT3524 open drain active
low output. The quiescent supply current is
extremely low, typically 1碌A(chǔ), making it ideal for
portable battery operated equipment.
The AAT3520/2/4 are available in a 3 pin SOT23
package and are specified over -40擄 to 85擄C oper-
ating temperature range.
Features
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PowerManager
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1.2V to 5.5V Input voltage range
Operation down to 1.2V
Extremely low quiescent current: less than 2碌A(chǔ)
High accuracy detection threshold: 鹵1.5%
Monitor Power Supply Voltages
Fixed thresholds from 2.2V to 4.6V
Reset pulse width options
鈥?Minimum 30 ms or 150ms
鈥?Fast propagation delay <20碌s
Available output configurations:
鈥?Open-drain output
鈥?CMOS active high output
鈥?CMOS active low output
Temp range -40 to 85擄C
3 pin SOT23 package
Preliminary Information
Applications
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Notebook Computers
Cell Phones
Portable Electronics
Embedded Systems
Intelligent Instruments
Typical Application
V
CC
V
CC
*
100k
(nominal)
V
CC
AAT3520
AAT3522
RESET
AAT3524
(RESET)
RESET
uP
INPUT
GND
GND
*AAT3524 Only
3520.2002.2.0.9
1
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