Analogic AAT3520IGY-2.63-200-T1 Micropowerâ ¢ microprocessor reset circuit Datasheet

AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
General Description
Features
The AAT3520 series of PowerManager products is
part of AnalogicTech's Total Power Management
IC™ (TPMIC™) product family. These microprocessor reset circuits are ideal for monitoring voltage supplies in portable systems, where extended
battery life is critical. They provide a low-cost, reliable 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 operate 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 current is extremely low, typically 1µA, making it ideal
for portable battery-operated equipment.
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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.
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
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Applications
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Cell Phones
Embedded Systems
Intelligent Instruments
Notebook Computers
Portable Electronics
Typical Application
VCC
VCC
VCC
*
100kΩ
(nominal)
AAT3520
AAT3522 RESET
AAT3524 (RESET)
GND
RESET
µP
INPUT
GND
*AAT3524 Only
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Pin Descriptions
Pin #
Symbol
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.
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.
2
3
Function
Part Number Descriptions
Part Number
Part Description
AAT3520
Reset Output Push Pull Active High with Delay
AAT3522
Reset Output Push Pull Active Low with Delay
AAT3524
Reset Output Open Drain Active Low with Delay
Pin Configuration
SOT23-3
(Top View)
GND
1
3
(RESET) RESET
2
VCC
2
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
VCC
VRESET
IMAX
IRESET
dVCC/dt
TJ
TLEAD
Description
VCC 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 VCC
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads) for 10s
Value
Units
-0.3 to 5.5
-0.3 to VCC + 0.3
-0.3 to 5.5
20
20
100
-40 to 150
300
V
V
mA
mA
V/µs
°C
°C
Thermal Information2
Symbol
ΘJA
PD
Description
Maximum Thermal Resistance
Maximum Power Dissipation
Value
Units
200
320
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions 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
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
VCC
Operation Voltage
IQ
Quiescent Current
VTH
RESET Threshold (Table 1)
∆VTH/°C
RESET Threshold
Temperature Coefficient
RESET Propagation Delay
RESET Active Timeout
Period
tP
tRDY
VOL
VOH
VOL
VOH
IDOFF
4
Description
Conditions
Min
TA = 0ºC to +70ºC
TA = -40ºC to +85ºC
VCC = 5.5V
VCC = 3V
TA = 25ºC
TA = -40ºC to +85ºC
1.0
1.2
VCC = VTH to (VTH - 100mV)
-50 Option
-200 Option
ISINK = 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
ISOURCE = 800µA, VTH > 3.08V,
RESET High Output Voltage VCC > VTH (max)
AAT3522
ISOURCE = 500µA, VTH ≤ 3.08V,
VCC > VTH (max)
ISINK = 1.2mA, VCC > VTH (max),
RESET Low Output Voltage VTH ≤ 3.08V, RESET Not Asserted
AAT3520
ISINK = 3.2mA, VCC > VTH (max),
VTH > 3.08V, RESET Not Asserted
ISOURCE = 500µA, VCC > 2.1V,
RESET High Output Voltage RESET Asserted
AAT3520
ISOURCE = 50µA, VCC > 1.2V,
RESET Asserted
RESET Leakage Current
VCC > VTH
AAT3524
VTH - 1.5%
VTH - 2.5%
Typ
Max
1.05
0.85
VTH
VTH
5.5
5.5
3
2
VTH + 1.5%
VTH + 2.5%
40
30
150
15
50
250
Units
V
µA
V
ppm/°C
µs
100
400
ms
0.3
V
0.4
VCC -1.5
V
0.8 VCC
0.3
V
0.4
0.8VCC
V
0.8VCC
1
µA
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AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Typical Characteristics
Normalized Reset Threshold
vs. Temperature
Supply Current vs. Temperature
1.003
VCC = 5V
1.20
Normalized Threshold
Supply Current (µA)
1.40
1.00
0.80
VCC = 3V
0.60
0.40
0.20
0.00
-40
-20
0
20
40
60
1.002
1.001
1.000
0.999
0.998
0.997
80
-40
Temperature (°C)
-20
0
20
40
60
80
Temperature (°C)
Power-Down Reset Propagation
Delay vs. Temperature
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
-40
-20
0
20
40
60
80
100
Temperature (°C)
Reset Propagation Delay (µs)
Normalized Power-Up
Reset Timeout (ms)
Normalized Power-Up Reset Timeout
vs. Temperature
30
25
VOD = 10mV
20
15
10
VOD = 100mV
5
0
-40
-20
0
20
40
60
80
Temperature (°C)
Maximum Transient Duration
vs. Reset Threshold Overdrive
Maximum Transient
Duration (µs)
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
Generator
+ Timer
RESET
(RESET)
Oscillator
VREF
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 AAT3520 series of microprocessor
reset devices monitor the supply voltage to a microprocessor and assert a reset signal whenever the
VCC
RESET
VTH
VTH
tRDY
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
VTH
tRDY
Figure 1: Reset Timing Diagram (AAT3522, AAT3524).
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3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Supply Voltage Transient Behavior
Applications Information
In some cases, fast negative transients of short
duration can appear on the VCC power supply. The
AAT3520 series devices provide some immunity to
line transients which can generate invalid reset pulses. 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 voltage becomes larger, the time allowed before asserting 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.
Reset Output Options
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 higher 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 external 100kΩ resistor should be connected between
the RESET output and GND.
VCC
VCC
VCC
*
100kΩ
(nominal)
0.1µF
AAT3520
AAT3522 RESET
AAT3524 (RESET)
RESET
µP
INPUT
GND
GND
*AAT3524 Only
Figure 2: Using Recommended Bypass Capacitor.
+3.3V
+5.0V
VCC
VCC
100kΩ
AAT3524 RESET
GND
RESET
INPUT
5V
System
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)
Ordering
Part Number2
TA = 25°C
TA = -40°C to +85°C
Marking3
Minimum Reset
Active (ms)
Min
Typ
Max
Min
Max
AAT3522IGY-2.20-200-T1
DBXYY
150
2.167
2.200
2.233
2.145
2.255
AAT3520IGY-2.32-200-T1
AAT3522IGY-2.32-200-T1
AAT3524IGY-2.32-200-T1
DTXYY
150
150
150
2.285
2.320
2.355
2.262
2.378
AAT3522IGY-2.45-200-T1
DXXYY
150
2.413
2.450
2.487
2.389
2.511
AAT3520IGY-2.63-200-T1
AAT3522IGY-2.63-200-T1
AAT3524IGY-2.63-200-T1
GNXYY
CAXYY
CWXYY
150
150
150
2.591
2.630
2.669
2.564
2.696
AAT3520IGY-2.93-200-T1
AAT3522IGY-2.93-50-T1
AAT3522IGY-2.93-200-T1
AAT3524IGY-2.93-200-T1
CZXYY
FVXYY
CCXYY
FPXYY
150
30
150
150
2.886
2.930
2.974
2.857
3.003
AAT3520IGY-3.08-50-T1
AAT3520IGY-3.08-200-T1
AAT3522IGY-3.08-50-T1
AAT3522IGY-3.08-200-T1
AAT3524IGY-3.08-200-T1
EFXYY
CNXYY
CYXYY
CBXYY
BGXYY
30
150
30
150
150
3.034
3.080
3.126
3.003
3.157
AAT3520IGY-4.38-200-T1
AAT3522IGY-4.38-200-T1
AAT3524IGY-4.38-200-T1
FUXYY
IVXYY
150
150
150
4.314
4.380
4.446
4.271
4.490
AAT3520IGY-4.63-200-T1
AAT3522IGY-4.63-200-T1
AAT3524IGY-4.63-200-T1
HKXYY
DAXYY
DUXYY
150
150
150
4.561
4.630
4.699
4.514
4.746
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.
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3520.2006.03.1.2
AAT3520/2/4
MicroPower™ Microprocessor Reset Circuit
Package Information
SOT23-3
2.37 ± 0.27
1.30 ± 0.10
2.92 ± 0.12
0.95 BSC
4° ± 4°
0.14 ± 0.06
0.96 ± 0.21
0.86 ± 0.16
0.075 ± 0.075
1.90 BSC
0.40 ± 0.10 × 3
0.50 ± 0.10
0.54 REF
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.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
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
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control 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
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