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
*
100kΩ
(nominal)
VCC
AAT3520
AAT3522
RESET
AAT3524
(RESET)
RESET
µP
INPUT
GND
GND
*AAT3524 Only
3520.2006.03.1.2
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Pin Descriptions
Pin #
1
Symbol
GND
RESET
(AAT3520)
Function
Ground connection.
RESET output remains high while V
CC
is below the reset threshold
and remains so for a fixed time period after V
CC
raises above the
reset threshold.
RESET output remains low while V
CC
is below the reset threshold
and remains so for a fixed time period after V
CC
raises above the
reset threshold.
Supply voltage (+1.2V to +5.5V). Due to extremely low operating
current, place a 10nF capacitor between VCC and GND.
2
RESET
(AAT3522,
AAT3524)
3
VCC
Part Number Descriptions
Part Number
AAT3520
AAT3522
AAT3524
Part Description
Reset Output Push Pull Active High with Delay
Reset Output Push Pull Active Low with Delay
Reset Output Open Drain Active Low with Delay
Pin Configuration
SOT23-3
(Top View)
GND
1
3
VCC
(RESET) RESET
2
2
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
CC
V
RESET
I
MAX
I
RESET
dV
CC
/d
t
T
J
T
LEAD
Description
V
CC
to GND
RESET to GND (Push-Pull Output)
RESET to GND (Open Drain Output)
Maximum Continuous Input Current
RESET/RESET Current
Rate of Rise of V
CC
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads) for 10s
Value
-0.3 to 5.5
-0.3 to V
CC
+ 0.3
-0.3 to 5.5
20
20
100
-40 to 150
300
Units
V
V
mA
mA
V/µs
°C
°C
Thermal Information
2
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
Value
200
320
Units
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Electrical Characteristics
V
IN
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C; V
CC
= 5V for 4.63/4.38V
versions; V
CC
= 3.3V for 3.08/2.93V versions; V
CC
= 3.0V for 2.63V version; V
CC
= 2.5V for 2.32/2.2V versions.
Symbol
V
CC
I
Q
V
TH
∆V
TH
/°C
t
P
t
RDY
Description
Operation Voltage
Quiescent Current
RESET Threshold (Table 1)
RESET Threshold
Temperature Coefficient
RESET Propagation Delay
RESET Active Timeout
Period
Conditions
T
A
= 0ºC to +70ºC
T
A
= -40ºC to +85ºC
V
CC
= 5.5V
V
CC
= 3V
T
A
= 25ºC
T
A
= -40ºC to +85ºC
Min
1.0
1.2
Typ
Max
5.5
5.5
3
2
V
TH
+ 1.5%
V
TH
+ 2.5%
Units
V
µA
V
ppm/°C
µs
V
TH
- 1.5%
V
TH
- 2.5%
1.05
0.85
V
TH
V
TH
40
V
OL
V
OH
V
OL
V
OH
I
DOFF
V
CC
= V
TH
to (V
TH
- 100mV)
-50 Option
-200 Option
I
SINK
= 1.2mA, V
CC
= V
TH(min)
,
RESET Low Output Voltage V
TH
≤
3.08V, RESET Asserted
AAT3522, AAT3524
I
SINK
= 3.2mA, V
CC
= V
TH(min)
,
V
TH
>
3.08V, RESET Asserted
I
SOURCE
= 800µA, V
TH
>
3.08V,
RESET High Output Voltage V
CC
> V
TH (max)
AAT3522
I
SOURCE
= 500µA, V
TH
≤
3.08V,
V
CC
> V
TH (max)
I
SINK
= 1.2mA, V
CC
> V
TH (max)
,
RESET Low Output Voltage V
TH
≤
3.08V, RESET Not Asserted
AAT3520
I
SINK
= 3.2mA, V
CC
> V
TH (max)
,
V
TH
> 3.08V, RESET Not Asserted
I
SOURCE
= 500µA, V
CC
> 2.1V,
RESET High Output Voltage RESET Asserted
AAT3520
I
SOURCE
= 50µA, V
CC
> 1.2V,
RESET Asserted
RESET Leakage Current
V
CC
> V
TH
AAT3524
30
150
15
50
250
100
400
0.3
ms
V
0.4
V
CC
-1.5
V
0.8 V
CC
0.3
V
0.4
0.8V
CC
V
0.8V
CC
1
µA
4
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Typical Characteristics
Supply Current vs. Temperature
1.40
Normalized Reset Threshold
vs. Temperature
1.003
Supply Current (µA)
1.00
0.80
0.60
0.40
0.20
0.00
-40
-20
0
20
40
60
80
Normalized Threshold
1.20
V
CC
= 5V
1.002
1.001
1.000
0.999
0.998
0.997
-40
-20
0
20
40
60
80
V
CC
= 3V
Temperature (°C)
Temperature (°C)
Normalized Power-Up Reset Timeout
vs. Temperature
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
Power-Down Reset Propagation
Delay vs. Temperature
Reset Propagation Delay (µs)
30
25
20
15
10
5
0
-40
Normalized Power-Up
Reset Timeout (ms)
V
OD
= 10mV
V
OD
= 100mV
-40
-20
0
20
40
60
80
100
Temperature (°C)
-20
0
20
40
60
80
Temperature (°C)
Maximum Transient Duration
vs. Reset Threshold Overdrive
400
Maximum Transient
Duration (µs)
350
300
250
200
150
100
50
0
1
10
100
1000
Reset Threshold Overdrive, V
TH
- V
CC
(mV)
3520.2006.03.1.2
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