AAT3522IGY-3.08-50-T1 [AAT]
MicroPower™ Microprocessor Reset Circuit; 微功耗™微处理器复位电路
| 型号： | AAT3522IGY-3.08-50-T1 |
| 厂家： | 
ADVANCED ANALOG TECHNOLOGY, INC. |
| 描述： | MicroPower™ Microprocessor Reset Circuit |
| 文件： | 总9页 (文件大小：100K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
™
PowerManager
General Description
Features
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 VCC 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 VCC. 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.
•
•
•
•
•
•
•
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
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.
Embedded Systems
Intelligent Instruments
Notebook Computers
Portable Electronics
Typical Application
VCC
VCC
VCC
*
100kΩ
(nominal)
AAT3520
RESET
µP
RESET
AAT3522
INPUT
(RESET)
AAT3524
GND
GND
*AAT3524 Only
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1
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Pin Descriptions
Pin #
Symbol
Function
1
GND
Ground connection.
RESET
(AAT3520)
RESET output remains high while VCC is below the reset threshold
and remains so for a fixed time period after VCC raises above the
reset threshold.
2
3
RESET
(AAT3522,
AAT3524)
RESET output remains low while VCC is below the reset threshold
and remains so for a fixed time period after VCC raises above the
reset threshold.
VCC
Supply voltage (+1.2V to +5.5V). Due to extremely low operating
current, place a 10nF capacitor between VCC and GND.
Part Number Descriptions
Part Number
AAT3520
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
AAT3522
AAT3524
Pin Configuration
SOT23-3
(Top View)
1
GND
3
VCC
2
(RESET) RESET
2
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
Value
Units
VCC
VCC to GND
-0.3 to 5.5
V
RESET to GND (Push-Pull Output)
RESET to GND (Open Drain Output)
Maximum Continuous Input Current
RESET/RESET Current
Rate of Rise of VCC
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads) for 10s
-0.3 to VCC + 0.3
VRESET
V
-0.3 to 5.5
20
20
100
-40 to 150
300
IMAX
IRESET
dVCC/dt
TJ
mA
mA
V/µs
°C
TLEAD
°C
Thermal Information2
Symbol
Description
Value
Units
ΘJA
PD
Maximum Thermal Resistance
Maximum Power Dissipation
200
320
°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.
3520.2006.03.1.2
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C; VCC = 5V for 4.63/4.38V
versions; VCC = 3.3V for 3.08/2.93V versions; VCC = 3.0V for 2.63V version; VCC = 2.5V for 2.32/2.2V versions.
Symbol Description
Conditions
Min
Typ
Max
Units
TA = 0ºC to +70ºC
TA = -40ºC to +85ºC
1.0
1.2
5.5
5.5
3
VCC
IQ
Operation Voltage
V
VCC = 5.5V
1.05
0.85
Quiescent Current
µA
V
VCC = 3V
TA = 25ºC
TA = -40ºC to +85ºC
2
VTH - 1.5% VTH VTH + 1.5%
VTH - 2.5% VTH VTH + 2.5%
VTH
RESET Threshold (Table 1)
RESET Threshold
Temperature Coefficient
RESET Propagation Delay
RESET Active Timeout
Period
∆VTH/°C
tP
40
15
50
250
ppm/°C
µs
VCC = VTH to (VTH - 100mV)
-50 Option
-200 Option
30
150
100
400
tRDY
ms
I
SINK = 1.2mA, VCC = VTH(min)
RESET Low Output Voltage VTH ≤ 3.08V, RESET Asserted
AAT3522, AAT3524 ISINK = 3.2mA, VCC = VTH(min)
VTH > 3.08V, RESET Asserted
SOURCE = 800µA, VTH > 3.08V,
RESET High Output Voltage VCC > VTH (max)
AAT3522
,
0.3
0.4
VOL
VOH
VOL
V
V
V
,
I
VCC -1.5
0.8 VCC
ISOURCE = 500µA, VTH ≤ 3.08V,
VCC > VTH (max)
ISINK = 1.2mA, VCC > VTH (max)
,
0.3
0.4
RESET Low Output Voltage VTH ≤ 3.08V, RESET Not Asserted
AAT3520 ISINK = 3.2mA, VCC > VTH (max)
VTH > 3.08V, RESET Not Asserted
SOURCE = 500µA, VCC > 2.1V,
RESET High Output Voltage RESET Asserted
,
I
0.8VCC
0.8VCC
VOH
V
AAT3520
ISOURCE = 50µA, VCC > 1.2V,
RESET Asserted
RESET Leakage Current
AAT3524
IDOFF
VCC > VTH
1
µA
4
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Typical Characteristics
Normalized Reset Threshold
vs. Temperature
Supply Current vs. Temperature
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
1.003
1.002
1.001
1.000
0.999
0.998
0.997
VCC = 5V
VCC = 3V
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Power-Down Reset Propagation
Delay vs. Temperature
Normalized Power-Up Reset Timeout
vs. Temperature
30
25
20
15
10
5
1.5
VOD = 10mV
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
VOD = 100mV
-40
-20
0
20
40
60
80
100
0
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Maximum Transient Duration
vs. Reset Threshold Overdrive
400
350
300
250
200
150
100
50
0
1
10
100
1000
Reset Threshold Overdrive, VTH - VCC (mV)
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Functional Block Diagram
VCC
Reset
RESET
Generator
+ Timer
(RESET)
Oscillator
VREF
GND
VCC 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 fixed time period (tRDY) after VCC has
risen above the threshold, as shown in Figure 1.
See Ordering Information for available RESET
active timeout periods
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 AAT3520 series of microprocessor
reset devices monitor the supply voltage to a micro-
processor and assert a reset signal whenever the
VCC
VTH
VTH
VTH
tRDY
tRDY
RESET
Figure 1: Reset Timing Diagram (AAT3522, AAT3524).
6
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Supply Voltage Transient Behavior
In some cases, fast negative transients of short
duration can appear on the VCC power supply. The
Applications Information
Reset Output Options
AAT3520 series devices provide some immunity to
line transients which can generate invalid reset puls-
es. Figure 1 shows typical behavior to short duration
pulses versus RESET comparator overdrive. As
shown in the Maximum Transient Duration vs. Reset
Threshold Overdrive graph, when the transient volt-
age becomes larger, the time allowed before assert-
ing a reset becomes shorter (i.e., typically a transient
of 100mV below the reset threshold would have to
present for more than 50µs to cause a reset).
Immunity can be increased by the addition of a small
bypass capacitor of 0.1µF connected as closely to
the VCC pin as possible.
The AAT3524 has an active low open drain output
and the AAT3520/2 have a push-pull output. The
AAT3524 may be used in multiple voltage systems
with an external pull-up resistor. This allows the
AAT3524 to interface to microprocessors with high-
er supply voltages up to 5.5V (Figure 3). In the
event of a power down or brown-out condition, the
reset signal remains valid until the VCC drops below
1.2V. To ensure validity down to ground, an exter-
nal 100kΩ resistor should be connected between
the RESET output and GND.
VCC
VCC
VCC
µP
*
100kΩ
(nominal)
AAT3520
RESET
INPUT
RESET
0.1µF
AAT3522
AAT3524
(RESET)
GND
GND
*AAT3524 Only
Figure 2: Using Recommended Bypass Capacitor.
+3.3V
+5.0V
VCC
VCC
100kΩ
5V
System
RESET
INPUT
RESET
AAT3524
GND
GND
Figure 3: Using AAT3524 Open Drain Output with Multiple Supplies.
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Factory Trimmed Reset Thresholds1 and Ordering Information
Reset Threshold Voltage, VTH (V)
TA = 25°C
Typ
TA = -40°C to +85°C
Ordering
Minimum Reset
Marking3
Active (ms)
Part Number2
Min
Max
Min
Max
AAT3522IGY-2.20-200-T1 DBXYY
150
2.167 2.200 2.233
2.285 2.320 2.355
2.413 2.450 2.487
2.591 2.630 2.669
2.145
2.255
AAT3520IGY-2.32-200-T1
AAT3522IGY-2.32-200-T1 DTXYY
AAT3524IGY-2.32-200-T1
150
150
150
2.262
2.389
2.564
2.378
2.511
2.696
AAT3522IGY-2.45-200-T1 DXXYY
150
AAT3520IGY-2.63-200-T1 GNXYY
AAT3522IGY-2.63-200-T1 CAXYY
AAT3524IGY-2.63-200-T1 CWXYY
150
150
150
AAT3520IGY-2.93-200-T1 CZXYY
150
30
AAT3522IGY-2.93-50-T1
FVXYY
2.886 2.930 2.974
3.034 3.080 3.126
2.857
3.003
3.003
3.157
AAT3522IGY-2.93-200-T1 CCXYY
150
150
AAT3524IGY-2.93-200-T1
AAT3520IGY-3.08-50-T1
FPXYY
EFXYY
30
150
30
AAT3520IGY-3.08-200-T1 CNXYY
AAT3522IGY-3.08-50-T1 CYXYY
AAT3522IGY-3.08-200-T1 CBXYY
AAT3524IGY-3.08-200-T1 BGXYY
150
150
AAT3520IGY-4.38-200-T1
AAT3522IGY-4.38-200-T1 FUXYY
AAT3524IGY-4.38-200-T1
150
150
150
4.314 4.380 4.446
4.561 4.630 4.699
4.271
4.514
4.490
4.746
IVXYY
AAT3520IGY-4.63-200-T1 HKXYY
AAT3522IGY-4.63-200-T1 DAXYY
AAT3524IGY-4.63-200-T1 DUXYY
150
150
150
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
1. Contact Local Sales Office for custom trimmed options.
2. Sample stock is generally held on part numbers listed in BOLD.
3. XYY = assembly and date code.
8
3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Package Information
SOT23-3
2.92 0.12
0.95 BSC
1.90 BSC
0.50 0.10
0.54 REF
0.40 0.10 × 3
All dimensions in millimeters.
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
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subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
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trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
3520.2006.03.1.2
9
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