AAT3524 [ANALOGICTECH]
MicroPower Microprocessor Reset Circuit; 微功耗微处理器复位电路
| 型号： | AAT3524 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | MicroPower Microprocessor Reset Circuit |
| 文件： | 总8页 (文件大小：227K) |
| 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 a member of AATI'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 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
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 designed to ignore fast line tran-
sients 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.
•
•
•
•
•
•
•
1.2V to 5.5V Input voltage range
Operation down to 1.2V
Extremely low quiescent current: less than 2µA
High accuracy detection threshold: 1.5ꢀ
Monitor Power Supply Voltages
Fixed thresholds from 2.2V to 4.6V
Reset pulse width options
•
•
Minimum 30 ms or 150ms
Fast propagation delay <20µs
•
Available output configurations:
•
•
•
Open-drain output
CMOS active high output
CMOS active low output
•
•
Temp range -40 to 85°C
3 pin SOT23 package
Applications
•
•
•
•
•
Notebook Computers
Cell Phones
Portable Electronics
Embedded Systems
Intelligent Instruments
The AAT3520/2/4 are available in a 3 pin SOT23
package and are specified over -40° to 85°C oper-
ating temperature range.
Typical Application
VCC
VCC
VCC
*
100k
(nominal)
AAT3520
AAT3522
AAT3524
RESET
uP
RESET
(RESET)
INPUT
GND
GND
*AAT3524 Only
3520.2002.2.0.9
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AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Pin Descriptions
AAT3520, 3522, 3524 (SOT23-3)
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)
Part Number Descriptions
SOT23-3 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
SOT-23
(Top View)
1
GND
3
VCC
2
(RESET) RESET
2
3520.2002.2.0.9
AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Absolute Maximum Ratings (TA=25°C unless otherwise noted)
Symbol
Description
Value
Units
VCC
VCC to GND
-0.3 to 5.5
-0.3 to VCC+0.3
-0.3 to 5.5
20
V
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
VRESET
IMAX
IRESET
dVcc/dt
TJ
mA
mA
V/µs
°C
20
100
-40 to 150
300
TLEAD
°C
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Thermal Information
Symbol
Description
Maximum Thermal Resistance (SOT23-3)1
Maximum Power Dissipation (SOT23-3)1
Value
200
320
Units
°C/W
mW
ΘJA
PD
Note 1: Mounted on an FR4 board.
Electrical Characteristics (VIN = 5V, TA = -40 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 and 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
V
CC = 5.5V
1.05
0.85
Quiescent Current
µA
V
VCC = 3V
TA = 25ºC
TA = -40ºC to +85ºC
2
VTH -1.5ꢀ VTH VTH +1.5ꢀ
VTH -2.5ꢀ VTH VTH +2.5ꢀ
VTH
RESET Threshold (Table 1)
∆VTH/°C
RESET Threshold Tempco
RESET Propagation Delay
40
15
50
ppm/°C
µs
tP
VCC = VTH to (VTH -100mV)
-50 option
-200 option
30
150
100
400
0.3
tRDY
RESET Active Timeout Period
ms
250
ISINK =1.6mA, VCC > 2.1V,
RESET Low Output Voltage
AAT3522, AAT3524
RESET asserted
ISINK =100µA, VCC >1.2V,
RESET asserted
VOL
VOH
V
V
0.4
RESET High Output Voltage
AAT3522
ISOURCE = 800 µA
VCC -1.5
I
SINK =1.2mA, VCC > 1.2V,
0.3
0.4
RESET Low Output Voltage
AAT3520
RESET not asserted
ISINK = 3.2mA, VCC > 4.5V,
RESET not asserted
VOL
V
ISOURCE = 500µA, VCC > 2.1V, 0.8VCC
RESET High Output Voltage
AAT3520
RESET asserted
ISOURCE = 50µA, VCC > 1.2V,
RESET asserted
VOH
V
0.8VCC
IDOFF
RESET leakage current, AAT3524 VCC > VTH
1
µA
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AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Typical Characteristics
Normalized Reset Threshold
vs. Temperature
Supply Current vs. Temperature
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
VCC=5V
1.003
1.002
1.001
1.000
0.999
0.998
VCC=3V
0.997
-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
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
VOD=10mV
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)
4
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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 +/-1.5ꢀ
at 25ºC and within +/- 2.5ꢀ over the entire operat-
ing 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)
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AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Supply Voltage Transient Behavior
In some cases fast negative transients of short dura-
tion 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 verses 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. e.g. 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
by-pass capacitor of 0.1µF connected as close 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 2). 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.
+3.3V
+5.0V
VCC
VCC
100k
5V
System
RESET
INPUT
RESET
AAT3524
GND
GND
Figure 2: Using AAT3524 Open Drain Output with Multiple Supplies
6
3520.2002.2.0.9
AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Factory Trimmed Reset Thresholds* and Ordering Information Table 1
Reset Threshold Voltage, VTH (V)
TA = 25ºC
Typ
TA = 40 to 85ºC
Ordering
Part Number
Minimum
Marking Reset Active (ms)
Min
Max
Min
Max
AAT3520IGY-2.32-200-T1
AAT3522IGY-2.32-200-T1
AAT3524IGY-2.32-200-T1
150
150
150
2.285
2.320
2.630
2.930
2.355
2.262
2.378
AAT3520IGY-2.63-200-T1
AAT3522IGY-2.63-200-T1
AAT3524IGY-2.63-200-T1
150
150
150
2.591
2.886
2.669
2.974
2.564
2.857
2.696
3.003
AAT3520IGY-2.93-200-T1
AAT3522IGY-2.93-200-T1
AAT3524IGY-2.93-200-T1
150
150
150
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
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
150
150
150
4.314
4.561
4.380
4.630
4.446
4.699
4.271
4.514
4.490
4.746
AAT3520IGY-4.63-200-T1
AAT3522IGY-4.63-200-T1
AAT3524IGY-4.63-200-T1
150
150
150
*Contact Local Sales Office for custom trimmed options
3520.2002.2.0.9
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AAT3520/2/4
MicroPower Microprocessor Reset Circuit
Package Information
SOT23-3
D
Millimeters
Inches
Dim
S1
Min
Max
1.02
0.10
-
Min
Max
.040
.004
-
A
A1
A2
b
C
D
E
e
H
L
.887
.013
-
0.034
0.0005
-
0.37
0.51
0.015
0.003
0.110
0.047
0.070
0.083
-
0.018
0.035
0°
0.020
0.007
0.120
0.055
0.080
0.104
0.027
0.024
0.040
8°
E
H
0.085 0.180
2.80
1.20
1.78
2.10
-
0.45
0.89
0°
3.04
1.40
2.05
2.64
0.69
0.60
1.03
8°
e
S
S
S1
θ1
Note:
A
1. PACKAGE BODY SIZE EXCLUDE MOLD FLASH
PROTRUSIONS OR GATE BURRS.
2. TOLERANCE 0.1000 mm (4mi) UNLESS OTHER-
WISE SPECIFIED
A2
Θ1
C
A1
L
b
3. COPLANARITY: 0.1000
4. DIMENSION L IS MEASURED IN GAGE PLANE
Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone (408) 524-9684
Fax (408) 524-9689
8
3520.2002.2.0.9
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