AAT3520 Datasheet, PDF (1/9 Pages) Advanced Analogic Technologies – MicroPower Microprocessor Reset Circuit

AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
General Description
The AAT3520 series of PowerManager products is
part of AnalogicTech's Total Power Management
IC™ (TPMIC™) 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 the need for external
components. The AAT3520 series operates by
monitoring the system power supply voltage. When
the input voltage 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 oper-
ate down to 1.2V and is designed to ignore fast line
transients 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 cur-
rent is extremely low, typically 1µA, making it ideal
for portable battery-operated equipment.
The AAT3520/2/4 are available in a Pb-free, 3-pin
SOT23 package and are specified over the -40°C
to +85°C operating temperature range.
Features
PowerManager^™
• Input Voltage Range: 1.2V to 5.5V
• Operation Down to 1.2V
• Extremely Low Quiescent Current: <2µA
• High Accuracy Detection Threshold: ±1.5%
• Monitor Power Supply Voltages
• Fixed Thresholds from 2.2V to 4.6V
• Reset Pulse Width Options
— Minimum 30ms or 150ms
— Fast Propagation Delay <20µs
• Available Output Configurations:
— Open-Drain Output
— CMOS Active High Output
— CMOS Active Low Output
• Temperature Range: -40°C to +85°C
• 3-Pin SOT23 Package
• 4kV ESD Rating
Applications
• Cell Phones
• Embedded Systems
• Intelligent Instruments
• Notebook Computers
• Portable Electronics
Typical Application
V_CC
VCC
AAT3520
AAT3522 ^RESET
AAT3524 ^(RESET)
*
100kΩ
(nominal)
VCC
RESET
INPUT
µP
GND
GND
*AAT3524 Only
3520.2006.03.1.2
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