Micropower µP Reset with Watchdog Timer
General Description
The AAT351x PowerManager™ products are
members of AnalogicTech™'s Total Power
Management IC™ product family. This family of
Microprocessor Reset Circuits provides the ulti-
mate in versatility, allowing system designers full
customization 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 space saving
5-pin SOT23 surface mount package and is speci-
fied over the -40 to +85°C temperature range.
AAT3510/1/2/3/4/5/6/7/8/9
PowerManager
™
SmartSwitch
™
Features
•
•
•
•
•
•
•
•
•
Tight voltage tolerance: ±1.5%
Low quiescent current: 5µA
Guaranteed Reset Valid down to 1V
32 voltage options from 2.6V to 5.0V
3 Reset active period options
• 1ms, 20ms, 140ms
3 Watchdog timeout period options
• 6.3ms, 102ms, 1600ms
4 output options:
• Open drain
• Inverting
• Non-inverting
• Bi-directional
Low Tempco: 100ppm/°C
5-pin SOT23 package
Applications
•
•
•
•
•
•
•
Notebook Computers
Portable Electronics
Industrial Controllers
Intelligent Instruments
Critical µP and µC Supply Monitoring
Power-On reset circuits
Embedded Control Systems
Typical Application
V
DD
V
CC
RESET
(RESET)
RESET
INPUT
V
DD
AAT351x
µ
P
I/O LINE
WDI
GND
3510.2004.08.1.4
1
Micropower µP Reset with Watchdog Timer
Pin Descriptions
Pin #
AAT3510 AAT3512 AAT3513
AAT3511
AAT3514
AAT3517
AAT3518
1
N/A
1
AAT3515
AAT3516
AAT3519
1
AAT3510/1/2/3/4/5/6/7/8/9
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 microproces-
sors 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
2
1
3
4
5
2
3
N/A
4
5
2
3
4
N/A
5
GND
RESET
MR
WDI
V
CC
3
4
5
Pin Configuration
5-lead SOT23
(Top View)
RESET
GND
MR
1
5
5-lead SOT23
(Top View)
V
CC
RESET
GND
1
5
V
CC
2
2
3
4
WDI
RESET
3
4
WDI
AAT3510
AAT3511
AAT3517
AAT3513
AAT3514
AAT3518
5-lead SOT23
(Top View)
RESET
GND
RESET
1
5
5-lead SOT23
(Top View)
V
CC
RESET
GND
1
5
V
CC
2
2
3
4
MR
MR
3
4
WDI
AAT3515
AAT3516
AAT3519
AAT3512
2
3510.2004.08.1.4
Micropower µP Reset with Watchdog Timer
Absolute Maximum Ratings
Symbol
V
CC
V
MR
, V
WDI
V
RESET
I
VCC
, I
MR
, I
WDI
I
RESET
dV
CC
/dt
T
J
(T
A
=25°C unless otherwise noted)
AAT3510/1/2/3/4/5/6/7/8/9
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° 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
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
Θ
JA
P
D
Description
Maximum Thermal Resistance
1
Maximum Power Dissipation
1
Value
190
526
Units
°C/W
mW
Note 1: Mounted on FR4 board
Electrical Characteristics
Typical values are at T
A
=25°C )
Symbol Description
V
CC
I
CC
(V
CC
= 2.5V to 5.5V, T
A
= -40 to +85°C
1
unless otherwise noted.
Conditions
V
CC
V
CC
V
CC
V
CC
=
=
=
=
3.6V
5.5V
3.6V
5.5V
Min
1
Typ
5
6
Max
5.5
15
18
15
18
V
THNOM
+1.5%
V
THNOM
+2.5%
Units
V
V
TH
T
C
t
RP
T
RD
Operating Voltage Range T
A
= -40°C to +85°C
AAT3510/1/2/3/4/7/8:
MR & WDI unconnected
Supply Current
AAT3515/6/9:
MR unconnected
T
A
= 25°C
Reset Threshold Voltage
T
A
= -40 to +85°C
Reference Voltage
-40°C < T
A
< +85°C
Temp Coeff
AAT351xIGV-xx-A-x-T1
Reset Active Timeout
AAT351xIGV-xx-B-x-T1
Period
AAT351xIGV-xx-C-x-T1
V
CC
to RESET Delay
V
CC
falling at 1mV/µs
µA
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
3510.2004.08.1.4
3
Micropower µP Reset with Watchdog Timer
Electrical Characteristics
Typical values are at T
A
=25°C )
Symbol
Description
Conditions
Min
Typ
Max
0.3
0.3
0.3
0.4
AAT3510/1/2/3/4/5/6/7/8/9
(V
CC
= 2.5V to 5.5V, T
A
= -40 to +85ºC
1
unless otherwise noted.
Units
Push/Pull RESET Output (AAT3510, 3512, 3513, 3514, 3515, 3516, 3518, 3519)
V
CC
≥
1.0V, I
SINK
= 50µA
V
CC
≥
1.2V, I
SINK
= 100µA
V
OL
RESET Low Output Voltage
V
CC
≥
2.7V, I
SINK
= 1.2mA
V
CC
≥
4.5V, I
SINK
= 3.2mA
V
CC
≥
2.7V, I
SOURCE
= 500µA
0.8 x V
CC
V
OH
RESET High Output Voltage
V
CC
≥
4.5V, I
SOURCE
= 800µA
V
CC
- 1.5
V
CC
≥
2.7V, I
SINK
= 1.2mA
RESET Low Output Voltage
V
CC
≥
4.5V, I
SINK
= 3.2mA
V
OH
V
CC
≥
1.8V, I
SOURCE
= 150µA
0.8 x V
CC
RESET High Output Voltage
V
CC
≥
2.7V, I
SOURCE
= 500µA
0.8 x V
CC
V
CC
≥
4.5V, I
SOURCE
= 800µA
V
CC
- 1.5
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
t
R
RESET Output Rise Time
3
V
CC
= 3.0V, C
L
= 250pF
V
CC
= 5.0V, C
L
= 400pF
V
PTH
Active Pullup Enable Threshold
V
CC
= 5.0V
0.4
RESET Active Pullup Current
V
CC
= 5.0V
RESET Pullup Resistance
4.2
Open-Drain RESET Output (AAT3517, 3518, 3519)
V
CC
≥
1.0V, I
SINK
= 50µA
V
CC
≥
1.2V, I
SINK
= 100µA
V
OL
RESET Low Output Voltage
V
CC
≥
2.7V, I
SINK
= 1.2mA
V
CC
≥
4.5V, I
SINK
= 3.2mA
I
D(OFF)
Reset Leakage Current
Watchdog Input (AAT3510, 3511, 3512, 3513, 3514, 3517, 3518)
AAT351xIGV-xx-x-A-T1
4.3
t
WD
Watchdog Timeout Period
AAT351xIGV-xx-x-B-T1
71
4
AAT351xIGV-xx-x-C-T1
1.12
t
WDI
WDI Minimum Pulse Width
V
IL
= 0.3 x V
CC
, V
IH
= 0.7 x V
CC
5
V
IL
WDI Input Threshold
0.3 x V
CC
5
V
IH
WDI Input Threshold
WDI = V
CC
, time average
I
WDI
WDI Input Current
6
-20
V
WDI
= 0, time average
V
V
0.3
0.4
V
400
333
333
666
666
0.65
20
4.7
ns
ns
5.2
0.3
0.3
0.3
0.4
1.0
V
mA
kΩ
V
µA
6.3
102
1.6
50
9.3
153
2.4
ms
s
ns
V
µA
120
-15
0.8 x V
CC
160
4
3510.2004.08.1.4
Micropower µP Reset with Watchdog Timer
Symbol
Description
Conditions
Min
0.3 x V
CC
0.7 x V
CC
1
35
100
52
230
75
AAT3510/1/2/3/4/5/6/7/8/9
Typ
Max
Units
V
µs
ns
kΩ
ns
Manual RESET Input (AAT3510, 3511, 3512, 3515, 3516, 3517, 3519)
V
IL
MR Input Threshold
V
IH
MR Input Threshold
MR Input Pulse Width
MR Glitch Rejection
MR Internal Pullup Resistance
T
A
= 25°C
MR to Reset Delay
V
CC
= 5V
Note 1: Over-temperature limits are guaranteed by design, not production tested.
Note 2: This is the minimum time RESET must be held low by an external pulldown source to set the active pullup flip-flop.
Note 3: Measured from RESET V
OL
to (0.8 x V
CC
), Open Circuit Output.
Note 4: Watchdog timeout period C is not available on AAT3513, AAT3514, and AAT3518.
Note 5: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 6: 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.
3510.2004.08.1.4
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