Analogic AAT3526ICX-438-200-T1 Micropower supervisory circuit with manual reset Datasheet

AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Features
The AAT3526/7/8 PowerManager™ products are
members of AATI'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 external components. The
AAT3526/7/8 products operate by monitoring the
system power supply voltage. When the input voltage drops below a fixed threshold, the device
asserts a reset signal for a minimum of 150ms after
VCC has risen back above the fixed threshold. They
are guaranteed to operate down to 1.2V and
designed to ignore fast line transients appearing on
VCC. The AAT3526/7/8 series is available with three
output stage versions: AAT3526 push-pull active
low output, AAT3527 push-pull active high output
and AAT3528 open drain active low output. The
quiescent supply current is extremely low, typically
1µA, making this device ideal for portable battery
operated equipment.
•
•
•
•
•
•
•
The AAT3526/7/8 are available in a 4 pin SOT143
package and are specified over -40° to 85°C operating temperature range.
PowerManager™
1.2V to 5.5V Input voltage range
Operation down to 1.2V
Extremely low quiescent current: less than 2µA
High accuracy detection threshold: ±1.5%
Monitor Power Supply Voltages
Fixed thresholds from 2.2V to 4.6V
Minimum 150ms reset pulse width with fast
delay time <20µs
Debounced Manual Reset Input
Available output configurations:
• Open-drain output
• CMOS active high output
• CMOS active low output
Temp range -40 to 85°C
4 pin SOT143 package
•
•
•
•
Applications
•
•
•
•
•
Notebook Computers
Cell Phones
Portable Electronics
Embedded Systems
Intelligent Instruments
Typical Application
VCC
VCC
VCC
*
100k
(nominal)
MR
AAT3526
AAT3527 RESET
(RESET)
AAT3528
GND
RESET
uP
INPUT
GND
*AAT3528 Only
3526.2002.1.0.62
1
Advanced Information
General Description
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Pin Descriptions
AAT3526, 3527, 3528 (SOT143)
Pin #
Symbol
1
GND
Function
Ground connection
RESET
(AAT3527)
RESET output remains high while VCC is below the reset threshold
and remains so for a minimum of 150ms after VCC raises above the
reset threshold.
RESET
(AAT3526,
AAT3528)
RESET output remains low while VCC is below the reset threshold
and remains so for a minimum of 150ms after VCC raises above the
reset threshold
3
MR
Manual Reset active low input. A logic low signal on MR asserts a
reset condition. Asserted reset continues as long as MR is low and
for a minimum of 150ms after MR returns high
4
Vcc
Supply Voltage (+1.2V to +5.5V)
2
Part Number Descriptions
Part Number
Output Type
AAT3526
Reset Output Push Pull Active Low with Delay
AAT3527
Reset Output Push Pull Active High with Delay
AAT3528
Reset Output Open Drain Active Low with Delay
Pin Configuration
SOT143
(Top View)
GND
(RESET) RESET
2
1
4
VCC
2
3
MR
3526.2002.1.0.62
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Absolute Maximum Ratings
Symbol
(TA=25°C unless otherwise noted)
Description
Value
Units
VCC
VCC to GND
-0.3 to 5.5
V
VMR
MR to GND
-0.3 to VCC+0.3
V
RESET to GND (Push-Pull Output)
-0.3 to VCC+0.3
VRESET
IVCC, IMR
IRESET
dVcc/dt
TJ
TLEAD
V
RESET to GND (Open Drain Output)
-0.3 to 5.5
Maximum Continuous Input Current
20
mA
RESET/RESET Current
20
mA
Rate of rise of VCC
100
V/µs
-40 to 150
°C
300
°C
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads) for 10s
Note: 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.
Thermal Information
Symbol
Description
Value
Units
ΘJA
Maximum Thermal Resistance (SOT143)
200
°C/W
PD
Maximum Power Dissipation (SOT143)1
320
mW
1
Note 1: Mounted on an FR4 board.
3526.2002.1.0.62
3
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
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
versions and VCC = 2.5V for 2.32/2.2V versions )
Symbol
VCC
Operation Voltage
IQ
Quiescent Current
VTH
∆VTH/°C
tP
tRDY
tMR
MRGI
tMD
RESET Threshold (Table 1)
RESET Threshold Tempco
RESET Propagation Delay
RESET Active Timeout Period
MR Minimum Pulse Width
MR Glitch Immunity
MR to Reset Propagation Delay
VIH
MR Input Threshold
VIL
MR Input Threshold
RMR
MR Pull-Up Resistance
VOL
RESET Low Output Voltage
AAT3526, AAT3528
VOH
4
Description
RESET High Output Voltage
AAT3526
VOL
RESET Low Output Voltage
AAT3527
VOH
RESET High Output Voltage
AAT3527
IDOFF
RESET leakage current, AAT3528
Conditions
Min
Typ
TA = 0ºC to +70ºC
TA = -40ºC to +85ºC
VCC = 5.5V
VCC = 3V
TA = 25ºC
TA = -40ºC to +85ºC
1.0
1.2
5.5
V
5.5
1.05
3
µA
0.85
2
VTH VTH +1.5%
V
VTH VTH +2.5%
40
ppm/°C
15
µs
250
400
ms
µs
100
ns
0.5
µs
VTH -1.5%
VTH -2.5%
VCC = VTH to (VTH -100mV)
150
10
VCC
VCC
VCC
VCC
=
=
=
=
VTH(MAX),
VTH(MAX),
VTH(MAX),
VTH(MAX),
VTH
VTH
VTH
VTH
≥ 4.38V
< 4.38V
≥ 4.38V
< 4.38V
2.3
0.7 × VCC
10
ISINK =1.6mA, VCC > 2.1V,
RESET asserted
ISINK =100µA, VCC >1.2V,
RESET asserted
ISOURCE = 800 µA
ISINK =1.2mA, VCC > 1.2V,
RESET not asserted
ISINK = 3.2mA, VCC > 4.5V,
RESET not asserted
ISOURCE = 500µA, VCC > 2.1V,
RESET asserted
ISOURCE = 50µA, VCC > 1.2V,
RESET asserted
VCC > VTH
Max
Units
V
20
0.8
0.25 × VCC
30
0.3
0.4
VCC -1.5
V
kΩ
V
V
0.3
0.4
V
0.8VCC
V
0.8VCC
1
µA
3526.2002.1.0.62
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Typical Characteristics
Normalized Reset Threshold
vs. Temperature
Supply Current vs. Temperature
1.20
VCC=5V
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
1.003
1.002
1.001
1.000
0.999
0.998
0.997
80
-40
-20
0
Temperature (°C)
280
260
240
220
200
180
160
20
40
60
80
100
Temperature (°C)
Reset Propagation Delay (µs)
Power-Up Reset
Timeout (ms)
300
0
60
80
Power-Down Reset Propagation
Delay vs. Temperature
320
-20
40
Temperature (°C)
Power-Up Reset Timeout
vs. Temperature
-40
20
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)
3526.2002.1.0.62
5
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Functional Block Diagram
MR
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 AAT3526/7/8 series of microprocessor reset devices monitor the supply voltage to a
VTH
VTH
microprocessor and assert a reset signal whenever
the 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 minimum of 150ms after VCC has
risen above the threshold as shown in Figure 1.
VTH
VCC
tRDY
tRDY
Figure 1: Reset Timing Diagram
6
3526.2002.1.0.62
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Applications Information
Reset Output Options
The AAT3528 has an active low open drain output
and the AAT3526/7 have a push-pull output. The
AAT3528 may be used in multiple voltage systems,
with an external pull-up resistor. This allows the
AAT3528 to interface to microprocessors with higher 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.
Manual Reset Input
A logic low signal on MR asserts a reset condition.
Reset continues to be asserted as long as MR is low
and for a minimum of 150ms after MR returns high.
This input is internally pulled up to VCC via a 20kΩ
resistor, so leaving the pin unconnected is acceptable if manual reset function is not needed. The MR
input is internally debounced which allows use of a
mechanical switch. It should be a normally-open
momentary switch connected from MR to GND.
Additionally, the MR pin can be driven from TTL,
CMOS, or open drain logic outputs.
Supply Voltage Transient Behavior
In some cases fast negative transients of short duration can appear on the VCC power supply. The
AAT3526/7/8 series devices provide some immunity
to line transients which can generate invalid reset
pulses. 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 voltage becomes larger, the time allowed
before asserting 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.
+3.3V
+5.0V
VCC
VCC
100k
AAT3528
MR
RESET
RESET
INPUT
GND
5V
System
GND
Figure 2: Using AAT3528 Open Drain Output with Multiple Supplies
3526.2002.1.0.62
7
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Factory Trimmed Reset Thresholds* and Ordering Information Table 1
Ordering
Part Number
Marking
Reset Threshold Voltage, VTH (V)
TA = 40 to 85ºC
TA = 25ºC
Min
Typ
Max
Min
Max
AAT3526ICX-2.32-200-T1
AAT3527ICX-2.32-200-T1
AAT3528ICX-2.32-200-T1
2.285
2.320
2.355
2.262
2.378
AAT3526ICX-2.63-200-T1
AAT3527ICX-2.63-200-T1
AAT3528ICX-2.63-200-T1
2.591
2.630
2.669
2.564
2.696
AAT3526ICX-2.93-200-T1
AAT3527ICX-2.93-200-T1
AAT3528ICX-2.93-200-T1
2.886
2.930
2.974
2.857
3.003
AAT3526ICX-3.08-200-T1
AAT3527ICX-3.08-200-T1
AAT3528ICX-3.08-200-T1
3.034
3.080
3.126
3.003
3.157
AAT3526ICX-4.38-200-T1
AAT3527ICX-4.38-200-T1
AAT3528ICX-4.38-200-T1
4.314
4.380
4.446
4.271
4.490
AAT3526ICX-4.63-200-T1
AAT3527ICX-4.63-200-T1
AAT3528ICX-4.63-200-T1
4.561
4.630
4.699
4.514
4.746
*Contact Local Sales Office for custom trimmed options
8
3526.2002.1.0.62
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
Package Information
SOT143
B
Dim
S
e1
A
A1
B
B1
C
D
E
E1
E2
H
I
S
Θ
CL
CL E H
PIN 1
e2
B1
D
θ
A
Millimeters
Min
Max
0.787
1.194
0.025
1.027
0.356
0.559
0.762
0.965
0.086
0.152
2.667
3.048
1.194
1.397
1.803
2.007
0.200 BSC
2.083
2.489
0.102
0.305
0.450
0.600
0°
8°
Inches
Min
Max
0.031
0.047
0.001
0.005
0.014
0.022
0.030
0.038
0.0034 0.006
0.105
0.120
0.047
0.055
0.071
0.079
0.008 BSC
0.082
0.098
0.004
0.012
0.018
0.024
0°
8°
C
A1
CL
3526.2002.1.0.62
CL
I
9
AAT3526/7/8
MicroPower Supervisory Circuit with Manual Reset
This page intentionally left blank.
Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086
Phone (408) 524-9684
Fax (408) 524-9689
10
3526.2002.1.0.62
Similar pages