AAT3510/1/2/3/4/5/6/7/8/9
Micropower µP Reset with Watchdog Timer
General Description
The AAT351x PowerManager products are mem-
bers of AnalogicTech's Total Power Management
IC™ (TPMIC™) product family. This family of
microprocessor reset circuits provides the ultimate
in versatility, allowing system designers full cus-
tomization of the µP monitor and reset function
without any additional components. The AAT351x
family offers several combinations of threshold
voltage, watchdog timeout period, reset active peri-
od, and output drive configurations, which are all
factory-programmed options. All devices are avail-
able in 32 reset threshold voltages from 2.6V up to
5V, with three watchdog timeout periods from
6.3ms to 1600ms and three reset timeouts from
1ms up to 140ms. Available output configurations
are active low push-pull, active low open drain,
active low bi-directional, and active high push-pull.
The AAT351x family is designed to ignore fast neg-
ative transients on V
DD
and to ensure that reset
outputs remain valid down to 1V.
The AAT351x family is available in the Pb-free,
space-saving 5-pin SOT23 surface mount package
and is specified over the -40 to +85°C temperature
range.
Features
•
•
•
•
•
•
•
PowerManager
™
SmartSwitch
™
•
•
Tight Voltage Tolerance: ±1.5%
Low Quiescent Current: 5µA
Guaranteed Reset Valid Down to 1V
32 Voltage Options from 2.6V to 5.0V
Three Reset Active Period Options:
— 1ms, 20ms, 140ms
Three Watchdog Timeout Period Options:
— 6.3ms, 102ms, 1600ms
Four Output Options:
— Open Drain
— Inverting
— Non-Inverting
— Bi-Directional
Low Temperature Coefficient: 100ppm/°C
5-Pin SOT23 Package
Applications
•
•
•
•
•
•
•
Critical µP and µC Supply Monitoring
Embedded Control Systems
Industrial Controllers
Intelligent Instruments
Notebook Computers
Portable Electronics
Power-On Reset Circuits
Typical Application
V
DD
VCC
RESET
(RESET)
RESET
INPUT
VDD
AAT351x
µP
I/O LINE
WDI
GND
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AAT3510/1/2/3/4/5/6/7/8/9
Micropower µP Reset with Watchdog Timer
Pin Descriptions
Pin #
AAT3510 AAT3512 AAT3513
AAT3511
AAT3514
AAT3517
AAT3518
1
N/A
1
AAT3515
AAT3516
AAT3519
1
Symbol
RESET
Function
AAT3510/13/15: RESET output goes low whenever V
DD
falls below the reset threshold. CMOS push-pull output.
AAT3511/14/16: RESET output goes low whenever V
DD
falls below the reset threshold. Bidirectional CMOS push-
pull output intended to interface directly to microprocessors
with bi-directional resets.
AAT3517/18/19: RESET output goes low whenever V
DD
falls below the reset threshold. Open drain output. Connect
a pull-up resistor to any supply voltage up to 5.5V.
Ground connection pin.
RESET active-high output. This CMOS push-pull signal is
the logical inverse of RESET.
Manual reset input pin. Active low. Pull low to force a reset.
Watchdog input pin. Triggers a reset if it remains in a
steady state for the duration of the watchdog timer period.
Input voltage pin.
2
N/A
3
4
5
2
1
3
4
5
2
3
N/A
4
5
2
3
4
N/A
5
GND
RESET
MR
WDI
VCC
Pin Configuration
5-lead SOT23
(Top View)
RESET
GND
MR
1
5
5-lead SOT23
(Top View)
VCC
RESET
GND
1
5
VCC
2
2
3
4
WDI
MR
3
4
WDI
AAT3510
AAT3511
AAT3517
AAT3512
5-lead SOT23
(Top View)
RESET
GND
RESET
1
5
5-lead SOT23
(Top View)
VCC
RESET
GND
1
5
VCC
2
2
3
4
WDI
RESET
3
4
MR
AAT3513
AAT3514
AAT3518
AAT3515
AAT3516
AAT3519
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AAT3510/1/2/3/4/5/6/7/8/9
Micropower µP Reset with Watchdog Timer
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
CC
V
MR
, V
WDI
V
RESET
I
VCC
, I
MR
, I
WDI
I
RESET
dV
CC
/dt
T
J
Description
V
CC
to GND
MR, WDI to GND
RESET to GND (Push-Pull or Bidirectional Output)
RESET to GND (Open Drain Output)
Maximum Continuous Input Current
RESET/RESET Output Current
Rate of Rise of V
CC
Operating Junction Temperature Range (-40°C to +150°C)
Max
-0.3 to 6
-0.3 to V
CC
+ 0.3
-0.3 to V
CC
+ 0.3
-0.3 to 6
20
20
100
150
Units
V
V
V
mA
mA
V/µs
°C
Thermal Information
2
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance
Maximum Power Dissipation
Value
190
526
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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AAT3510/1/2/3/4/5/6/7/8/9
Micropower µP Reset with Watchdog Timer
Electrical Characteristics
V
CC
= 2.5V to 5.5V, T
A
= -40°C to +85°C
1
, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol Description
V
CC
Operating Voltage Range
Conditions
T
A
= -40°C to +85°C
AAT3510/1/2/3/4/7/8:
MR & WDI Unconnected
AAT3515/6/9:
MR Unconnected
T
A
= 25°C
T
A
= -40 to +85°C
-40°C < T
A
< +85°C
AAT351xIGV-xx-A-x-T1
AAT351xIGV-xx-B-x-T1
AAT351xIGV-xx-C-x-T1
V
CC
Falling at 1mV/µs
V
CC
≥
1.0V, I
SINK
= 50µA
V
CC
≥
1.2V, I
SINK
= 100µA
V
CC
≥
2.7V, I
SINK
= 1.2mA
V
CC
≥
4.5V, I
SINK
= 3.2mA
V
CC
≥
2.7V, I
SOURCE
= 500µA
V
CC
≥
4.5V, I
SOURCE
= 800µA
V
CC
≥
2.7V, I
SINK
= 1.2mA
V
CC
≥
4.5V, I
SINK
= 3.2mA
V
CC
≥
1.8V, I
SOURCE
= 150µA
V
CC
≥
2.7V, I
SOURCE
= 500µA
V
CC
≥
4.5V, I
SOURCE
= 800µA
V
CC
= 3.6V
V
CC
= 5.5V
V
CC
= 3.6V
V
CC
= 5.5V
Min
1
Typ
5
6
Max
5.5
15
18
15
18
V
THNOM
+1.5%
V
THNOM
+2.5%
Units
V
I
CC
Supply Current
µA
V
TH
T
C
t
RP
T
RD
Reset Threshold Voltage
Reference Voltage
Temperature Coefficient
Reset Active Timeout
Period
V
CC
to RESET Delay
V
THNOM
-1.5% V
TH
V
THNOM
-2.5% V
TH
±40
1
20
140
1.4
28
200
40
V
ppm/°C
2
40
280
ms
µs
Push/Pull RESET Output (AAT3510, 3512, 3513, 3514, 3515, 3516, 3518, 3519)
V
OL
RESET Low Output Voltage
0.3
0.3
0.3
0.4
0.8 x V
CC
V
CC
- 1.5
0.3
0.4
0.8 x V
CC
0.8 x V
CC
V
CC
- 1.5
400
V
V
OH
RESET High Output Voltage
RESET Low Output Voltage
V
V
OH
RESET High Output Voltage
V
Bidirectional RESET Output (AAT3511, 3514, 3516)
t
S
Transition Flip-Flop Setup
Time
2
V
CC
= 3.0V, C
L
= 120pF
V
CC
= 5.0V, C
L
= 200pF
V
CC
= 3.0V, C
L
= 250pF
V
CC
= 5.0V, C
L
= 400pF
0.4
ns
333
333
666
666
t
R
RESET Output Rise Time
3
ns
V
PTH
Active Pull-Up Enable
V
CC
= 5.0V
Threshold
RESET Active Pull-Up
V
CC
= 5.0V
Current
RESET Pull-Up Resistance
0.65
20
V
mA
5.2
kΩ
4.2
4.7
1. Over-temperature limits are guaranteed by design, not production tested.
2. This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop.
3. Measured from RESET V
OL
to (0.8 x V
CC
), open circuit output.
4
3510.2006.03.1.7
AAT3510/1/2/3/4/5/6/7/8/9
Micropower µP Reset with Watchdog Timer
Electrical Characteristics
V
CC
= 2.5V to 5.5V, T
A
= -40°C to +85ºC
1
, unless otherwise noted. Typical values are at T
A
= 25°C.
Symbol
Description
Conditions
V
CC
V
CC
V
CC
V
CC
≥
≥
≥
≥
1.0V,
1.2V,
2.7V,
4.5V,
I
SINK
I
SINK
I
SINK
I
SINK
=
=
=
=
50µA
100µA
1.2mA
3.2mA
Min
Typ
Max
0.3
0.3
0.3
0.4
1.0
Units
Open-Drain RESET Output (AAT3517, 3518, 3519)
V
OL
I
D(OFF)
RESET Low Output Voltage
V
Reset Leakage Current
AAT351xIGV-xx-x-A-T1
AAT351xIGV-xx-x-B-T1
AAT351xIGV-xx-x-C-T1
2
V
IL
= 0.3 x V
CC
, V
IH
= 0.7 x V
CC
4.3
71
1.12
0.3 x V
CC
WDI = V
CC
, Time Average
V
WDI
= 0, Time Average
120
-15
6.3
102
1.6
50
µA
Watchdog Input (AAT3510, 3511, 3512, 3513, 3514, 3517, 3518)
t
WD
t
WDI
V
IL
V
IH
I
WDI
Watchdog Timeout Period
WDI Minimum Pulse Width
WDI Input Threshold
3
WDI Input Threshold
3
WDI Input Current
4
9.3
153
2.4
ms
s
ns
V
µA
0.8 x V
CC
160
-20
0.3 x V
CC
Manual RESET Input (AAT3510, 3511, 3512, 3515, 3516, 3517, 3519)
V
IL
V
IH
MR
MR
MR
MR
MR
MR
Input Threshold
Input Threshold
Input Pulse Width
Glitch Rejection
Internal Pull-Up Resistance
to Reset Delay
0.7 x V
CC
1
T
A
= 25°C
V
CC
= 5V
35
100
52
230
75
V
µs
ns
kΩ
ns
1. Over-temperature limits are guaranteed by design, not production tested.
2. Watchdog timeout period C is not available on AAT3513, AAT3514, and AAT3518.
3. WDI is internally serviced within the watchdog period if WDI is left unconnected.
4. The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is designed
for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capacitive load of 200pF.
The three-state device must be able to source and sink at least 200µA when active.
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