Ultralow Power Supervisory ICs with
Watchdog Timer and Manual Reset
Data Sheet
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F Document Feedback
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FEATURES
Ultralow power consumption with ICC = 92 nA (typical)
Continuous monitoring with no blank time
Pretrimmed voltage monitoring threshold options
10 options from 2 V to 4.63 V for the ADM8611
20 options from 0.5 V to 1.9 V for the ADM8612/ADM8615
5 options from 2.32 V to 4.63 V for the ADM8613/ADM8614
±1.3% threshold accuracy over full temperature range
Manual reset input
(ADM8611/ADM8612/ADM8613/ADM8615)
200 ms (typical) reset timeout
Low voltage input monitoring down to 0.5 V (ADM8612/
ADM8615)
Watchdog timer (ADM8613/ADM8614/ADM8615)
Watchdog function disable input (ADM8613/ADM8614 only)
Watchdog timeout extension input (ADM8614 only)
Active low, open-drain RESET output
Power supply glitch immunity
Available in a 1.46 mm × 0.96 mm WLCSP
Operational temperature range: −40°C to +85°C
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Energy metering
Energy harvesting
FUNCTIONAL BLOCK DIAGRAMS
Figure 1. ADM8612 Functional Block Diagram
Figure 2. ADM8614 Functional Block Diagram
GENERAL DESCRIPTION
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
are voltage supervisory circuits that monitor power supply voltage
levels and code execution integrity in microprocessor-based
systems. Apart from providing power-on reset signals, an on-
chip watchdog timer can reset the microprocessor if it fails to
strobe within a preset timeout period. A reset signal can also be
asserted by an external push-button through a manual reset input.
The ultralow power consumption of these devices makes them
suitable for power efficiency sensitive systems, such as battery-
powered portable devices and energy meters.
The features of each member of the device family are shown in
Table 9. Each device subdivides into submodels with differences
in factory preset voltage monitoring threshold options. In the
range of 2 V to 4.63 V, 10 options are available for the ADM8611.
In the range of 2.32 V to 4.63 V, five options are available for
both the ADM8613 and ADM8614. A separate supply input
allows the ADM8612 and ADM8615 to monitor 20 different
low voltage levels from 0.5 V to 1.9 V. Not all device options are
available as standard models. See the Ordering Guide for details.
The ADM8611, ADM8612, ADM8613, and ADM8615 can
reset on demand through the manual reset input. The watchdog
function on the ADM8613, ADM8614, and ADM8615 monitors
the heartbeat of the microprocessor through the WDI pin. The
ADM8613 and ADM8614 have a watchdog disable input, which
allows the user to disable the watchdog function, if required. The
ADM8614 also has a watchdog timeout extension input, allowing
the watchdog timeout to be extended from 1.6 sec to 100 sec.
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
are available in a 6-ball, 1.46 mm × 0.96 mm WLCSP. These
devices are specified over the temperature range of −40°C to +85°C.
MR
VCC
VIN
GND
V
TH
ADM8612
RESET
GENERATOR
DEBOUNCE
RESET
12782-001
GND
WDT_SELWD_DIS
WDI
VCC
V
TH
ADM8614
RESET
GENERATOR
RESET
WATCHDOG
DETECTOR
12782-002
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 2 of 17
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
Voltage Monitoring Input.......................................................... 12
VIN as an Adjustable Input ....................................................... 12
Transient Immunity ................................................................... 12
Reset Output ............................................................................... 12
Manual Reset Input .................................................................... 13
Watchdog Timer ......................................................................... 13
Watchdog Timeout Select Input ............................................... 13
Typical Application Circuits ..................................................... 13
Low Power Design Techinques ................................................. 14
Device Options ............................................................................... 15
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
2/2018—Rev. E to Rev. F
Changes to General Description Section ...................................... 1
Added Note 1, Table 1 ...................................................................... 4
Changed Device Options Section to Model Options Section ...... 15
Changes to Model Options Section.............................................. 15
Added Table 15; Renumbered Sequentially ................................ 16
Changes to Ordering Guide .......................................................... 17
12/2017—Rev. D to Rev. E
Changes to Ordering Guide .......................................................... 17
2/2017—Rev. C to Rev. D
Changes to Ordering Guide .......................................................... 17
5/2016—Rev. B to Rev. C
Changes to MR Pull-Up Resistance Parameter, Table 1 ............... 4
12/2015—Rev. A to Rev. B
Changes to Watchdog Timeout Period Parameter, Table 1 ......... 4
Changes to Ordering Guide .......................................................... 17
4/2015—Rev. 0 to Rev. A
Changes to Reset Threshold Hysteresis Parameter, Table 1 ........ 3
1/2015—Revision 0: Initial Version
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 3 of 17
SPECIFICATIONS
VCC = 2 V to 5.5 V, VIN < VCC + 0.3 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
OPERATING VOLTAGE RANGE VCC
ADM8611, ADM8613, ADM8614 0.9 5.5 V Guarantees valid RESET output
ADM8612, ADM8615 2 5.5 V Guarantees valid RESET output
0.9 V Guarantees RESET output low
UNDERVOLTAGE LOCKOUT (ADM8612,
ADM8615)
Input Voltage Rising UVLORISE 1.95 V
Input Voltage Falling UVLOFAL L 1.6 V
Hysteresis UVLOHYS 90 mV
INPUT CURRENT
VCC Quiescent Current ICC 92 190 nA VCC = 2 V to 5.5 V, RESET deasserts,
VWDI = VCC
110
nA
V
CC
= 2 V to 5.5 V,
RESET
deasserts,
VWDI = VCC, TA = 25°C
VIN Average Input Current 4 8.5 nA VIN = 2 V, VCC = 5.5 V
4 32 nA VIN = 2 V, VCC = 2 V
RESET THRESHOLD VOLTAGE1 VTH Input falling
ADM8611, ADM8613, ADM8614 VTH − 1.3% VTH VTH + 1.3% V See Table 10 and Table 12
ADM8612, ADM8615 VTH − 1.3% VTH VTH + 1.3% V VTH ≥ 1.2 V, see Table 11
VTH − 1.4% 1.1 VTH + 1.4% V 1.1 V threshold option
TH
1
V
TH
+ 1.6%
V
1 V threshold option
VTH − 1.6% 0.95 VTH + 1.6% V 0.95 V threshold option
VTH − 1.7% 0.9 VTH + 1.7% V 0.9 V threshold option
VTH − 1.8% 0.85 VTH + 1.8% V 0.85 V threshold option
VTH − 1.8% 0.8 VTH + 1.8% V 0.8 V threshold option
VTH − 1.9% 0.75 VTH + 1.9% V 0.75 V threshold option
VTH − 1.9% 0.7 VTH + 1.9% V 0.7 V threshold option
VTH − 2.0% 0.65 VTH + 2.0% V 0.65 V threshold option
VTH − 2.1% 0.6 VTH + 2.1% V 0.6 V threshold option
VTH − 2.1% 0.55 VTH + 2.1% V 0.55 V threshold option
VTH − 2.2% 0.5 VTH + 2.2% V 0.5 V threshold option
RESET THRESHOLD HYSTERESIS VHYST
ADM8611, ADM8613, ADM8614 0.9% × VTH V
ADM8612, ADM8615 0.9% × VTH V VTH > 1 V
10.3
mV
V
TH
≤ 1 V
RESET TIMEOUT PERIOD tRP 170 200 240 ms
PROPAGATION DELAY
VCC to RESET tPD_VCC
ADM8611, ADM8613, ADM8614 18 26 37 µs VCC falling with VTH × 10% overdrive
VIN to RESET tPD_VIN
ADM8612, ADM8615
23
35
µs
V
IN
falling with V
TH
× 10% overdrive
INPUT GLITCH REJECTION
VCC Glitch Rejection
t
GR_VCC
ADM8611, ADM8613, ADM8614 13.5 23 32 µs VCC falling, with VTH × 10% overdrive
VIN Glitch Rejection tGR_VIN
ADM8612, ADM8615 13.5 21 27 µs VIN falling with VTH × 10% overdrive
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 4 of 17
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
WATCHDOG INPUT, WDI (ADM8613,
ADM8614, ADM8615)
Watchdog Timeout Period1 tWD
ADM8613, ADM8615 tWD − 13% tWD tWD + 19% sec
ADM8614 tWD − 13% tWD tWD + 19% sec Base period, WD_SEL low
tWD − 13% tWD tWD + 19% sec Extended period, WD_SEL high
Leakage Current 5 nA VWDI = VCC = 5.5 V
Input Threshold
High 0.9 V
Low 0.4 V
WDI Pulse Width
t
WPR
ns
High pulse
tWPF 300 ns Low pulse
WDI Glitch Rejection 60 ns
RESET OUTPUT
Output Voltage Low VRST_OL 0.4 V VCC > 4.25 V, ISINK = 6.5 mA
0.4 V VCC > 2.5 V, ISINK = 6 mA
0.4 V VCC > 1.2 V, ISINK = 4.6 mA
0.4 V VCC > 0.9 V, ISINK = 0.9 mA
Leakage Current
5
nA
V
RESET
= V
CC
= 5.5 V
MANUAL RESET INPUT, MR (ADM8611,
ADM8612, ADM8613, ADM8615)
VIL 0.4 V
VIH 0.9 V
MR Minimum Input Pulse Width 1 µs
MR Glitch Rejection 0.4 µs
MR To Reset Delay tD_MR 0.65 µs
MR Pull-Up Resistance 300 600 900 kΩ
WATCHDOG TIMEOUT DISABLE INPUT,
WD_DIS (ADM8613, ADM8614)
VIL 0.4 V
VIH 0.9 V
Leakage Current
+5
nA
V
WD_DIS
= 0 V to V
CC
Glitch Rejection
0.1
µs
WATCHDOG TIMEOUT SELECTION
INPUT, WDT_SEL (ADM8614)
V
IL
0.4
V
VIH 0.9 V
Leakage Current −5 +5 nA VWDT_SEL = 0 V to VCC
1 Not all device options are available as standard models. See the Ordering Guide for details.
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 5 of 17
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VCC −0.3 V to +6 V
WD_DIS
−0.3 V to +6 V
RESET −0.3 V to +6 V
VIN −0.3 V to +6 V
MR −0.3 V to VCC + 0.3 V
WDI −0.3 V to VCC + 0.3 V
WDT_SEL
−0.3 V to V
CC
+ 0.3 V
Input/Output Current
10 mA
Storage Temperature Range −40°C to +150°C
Operating Temperature Range −40°C to +85°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
θJA is specified for a device soldered on an FR4 board with a
minimum footprint.
Table 3.
Package Type θJA Unit
6-Ball WLCSP 105.6 °C/W
ESD CAUTION
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 6 of 17
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 3. ADM8611 Pin Configuration
Table 4. ADM8611 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC Power Supply Input. The voltage on the VCC pin is monitored on the ADM8611. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground. Both GND pins on the ADM8611 must be grounded.
B1 DNC Do Not Connect. Do not connect to this pin.
B2 GND Ground. Both GND pins on the ADM8611 must be grounded.
C1 MR Manual Reset Input, Active Low.
C2 RESET Active Low, Open-Drain RESET Output.
Figure 4. ADM8612 Pin Configuration
Table 5. ADM8612 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC Power Supply Input. The voltage on the VCC pin is not monitored on the ADM8612. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground. Both GND pins on the ADM8612 must be grounded.
B1 MR Manual Reset Input, Active Low.
B2 GND Ground. Both GND pins on the ADM8612 must be grounded.
C1 VIN Low Voltage Monitoring Input. This separate supply input allows the ADM8612 to monitor low voltages on the
VIN pin to 0.5 V.
C2 RESET Active Low, Open-Drain RESET Output.
DNC = DO NOT CONNECT.
DO NOT CONNECT TO THIS PIN.
MR
VCC GND
DNC
RESET
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
A
B
C
2
BALL
A
1
INDICATOR
GND
12782-003
MR
VCC GND
VIN RESET
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
A
B
C
2
BALL
A
1
INDICATOR
GND
12782-006
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 7 of 17
Figure 5. ADM8613 Pin Configuration
Table 6. ADM8613 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC
Power Supply Input. The voltage on the VCC pin is monitored on the ADM8613. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground.
B1 WDI Watchdog Timer Input.
B2 WD_DIS
Watchdog Function Disable Input. Tie this pin high to disable the watchdog function of the device. Connect
this pin to ground if it is not used.
C1 MR Manual Reset Input, Active Low.
C2 RESET Active Low, Open-Drain RESET Output.
Figure 6. ADM8614 Pin Configuration
Table 7. ADM8614 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC Power Supply Input. The voltage on the VCC pin is monitored on the ADM8614. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground.
B1 WDI Watchdog Timer Input.
B2 WD_DIS
Watchdog Function Disable Input. Tie this pin high to disable the watchdog function of the device. Connect this
pin to ground if it is not used.
C1 WDT_SEL
Watchdog Timeout Selection Input. Pull this pin high to extend the watchdog timeout period of the ADM8614 to
100 sec. Pull this pin low to return the watchdog timeout period to its base value. Toggling WDT_SEL resets the
watchdog timer.
C2 RESET Active Low, Open-Drain RESET Output.
MR
VCC GND
WDI
RESET
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
A
B
C
2
BALL
A
1
INDICATOR
WD_DIS
12782-004
VCC GND
WDT_SEL
WDI
RESET
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
A
B
C
2
BALL
A
1
INDICATOR
WD_DIS
12782-007
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 8 of 17
Figure 7. ADM8615 Pin Configuration
Table 8. ADM8615 Pin Function Descriptions
Pin No. Mnemonic Description
A1 VCC Power Supply Input. The voltage on the VCC pin is not monitored on the ADM8615. It is recommended to place a
0.1 μF decoupling capacitor as close as possible to the device between the VCC pin and the GND pin.
A2 GND Ground.
B1 MR Manual Reset Input, Active Low.
B2 WDI Watchdog Timer Input.
C1 VIN Low Voltage Monitoring Input. This separate supply input allows the ADM8615 to monitor low voltages on the VIN
pin to 0.5 V.
C2 RESET Active Low, Open-Drain RESET Output.
MR
VCC GND
VIN RESET
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
A
B
C
2
BALL
A
1
INDICATOR
WDI
12782-005
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 9 of 17
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 8. Supply Current (ICC) vs. Temperature
Figure 9. Supply Current (ICC) vs. Supply Voltage, VCC < 2V
Figure 10. Supply Current (ICC) vs. Supply Voltage
Figure 11. Supply Current (ICC) vs. Logic Input Pin Voltage, with the Exception
of the MR Pin
Figure 12. Average Supply Current (ICC) vs. WDI Toggling Frequency, Using a
Square Pulse Signal with a Duty Cycle of 50%
Figure 13. VIN Pin and VCC Pin Input Current vs. VIN
70
75
80
85
90
95
100
105
110
115
120
–40 –30 –20 –10 010 20 30 40 50 60 70 80
I
CC
(n A)
TEMPERAT URE (
°C)
12782-008
0
0.5
1.0
1.5
2.0
2.5
3.0
00.5 1.0 1.5 2.0 2.5
I
CC
(µA)
SUPPLY VOLTAGE (V)
V
CC
FALLING
V
CC
RISING
12782-009
60
70
80
90
100
110
120
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
ICC ( nA)
SUPPLY VOLTAGE (V)
12782-010
0
100
200
300
400
500
600
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
I
CC
(n A)
LOGIC INPUT PIN VOLTAGE (V)
V
CC
= 2V
V
CC
= 3.3V
V
CC
= 5.5V
12782-111
0
20
40
60
80
100
120
140
160
180
200
0200 400 600 800 1000
ICC ( nA)
WDI TOGGLING FREQUENCY (Hz)
12782-112
–2
–1
0
1
2
3
4
5
6
7
8
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT CURRENT (µ A)
V
IN
(V)
I
VIN
, V
CC
= 0V
I
VIN
, V
CC
= 2V
I
CC
, V
CC
= 2V
12782-013
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 10 of 17
Figure 14. VIN Leakage Current vs. Temperature
Figure 15. Normalized Falling Threshold vs. Temperature
Figure 16. Maximum Transient Duration vs. Input Overdrive,
VCC and VIN Falling
Figure 17. Normalized Reset Timeout Period vs. Temperature
Figure 18. Normalized Watchdog Timeout Period vs. Temperature
Figure 19. RESET Pin Leakage vs. RESET Pin Voltage
0
1
2
3
4
5
6
7
8
–40 –30 –20 –10 010 20 30 40 50 60 70 80
VIN LEAKAGE CURRENT (nA)
TEMPERAT URE ( °C)
V
CC
= 5.5V
V
CC
= 3.3V
V
CC
= 2V
12782-014
0.980
0.985
0.990
0.995
1.000
1.005
1.010
1.015
1.020
–40 –20 020 40 60 80
NORMALIZED FALLING THRESHOLD
TEMPERAT URE ( °C)
V
TH
= 0.6V
V
TH
= 2.0V
V
TH
= 3.3V
V
TH
= 4.7V
12782-115
0
50
100
150
200
250
300
350
110 100
TRANS I E NT DURATION (µs)
INPUT OVERDRIVE (mV)
12782-016
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
–40 –30 –20 –10 010 20 30 40 50 60 70 80 90
NORMALIZED RESET TIMEOUT PERIOD
TEMPERAT URE ( °C)
12782-117
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
–40 –20 020 40 60 80
NORMALIZED WATCHDOG TIMEOUT PERIOD
TEMPERAT URE ( °C)
12782-118
–0.20
–0.15
–0.10
–0.05
0
0.05
0.10
0.15
0.20
0.25
0.30
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
12782-019
RESET PIN LEAKAGE (nA)
RESET PIN VOLTAG E (V)
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 11 of 17
Figure 20. RESET Pin Voltage vs. Voltage on VCC
(with the RESET Pin Pulled Up to the VCC Pin Through RPULLUP)
Figure 21. RESET Output Low Voltage (VRST_OL) vs. Sink Current (ISINK)
Figure 22. RESET Timeout Delay With VCC and VIN Rising
Figure 23. RESET Timeout Delay With VCC and VIN Falling
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 0.5 1.0 1.5 2.0 2.5 3.0
RESET PIN VOLTAGE (V)
V
CC
(V)
R
PULLUP
= 10kΩ
R
PULLUP
= 100kΩ
12782-020
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1234567891011121314151617181920
RESET OUTPUT LOW VOLTAGE (V)
ISINK (mA)
VCC = 0.9V
VCC = 1.2V
VCC = 2.5V
VCC = 4.25V
12782-021
12782-022
12782-023
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 12 of 17
THEORY OF OPERATION
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
low power voltage supervisors protect the integrity of system
operation by ensuring the proper operation during power-up,
power-down, and brownout conditions. These devices monitor
the input voltage level and compare it against an internal reference.
The RESET output asserts whenever the monitored voltage level
is below the reference threshold, keeping the processor in a reset
state. The RESET output deasserts if the monitored voltage rises
above the threshold reference for a minimum period, the active
reset timeout period. This ensures that the supply voltage for
the processor is raised to an adequate level and stable before
exiting reset.
The ultralow supply current makes the ADM8611/ADM8612/
ADM8613/ADM8614/ADM8615 devices particularly suitable
for use in low power, portable equipment.
Figure 24. ADM8611 Functional Block Diagram
Figure 25. ADM8613 Functional Block Diagram
Figure 26. ADM8615 Functional Block Diagram
VOLTAGE MONITORING INPUT
The VCC pin of the ADM8611/ADM8613/ADM8614 acts as
both a device power input node and a voltage monitoring input
node. The ADM8612 uses separate pins for supply and voltage
monitoring to achieve a low voltage monitoring threshold to 0.5 V.
It is recommended to place a 0.1 µF decoupling capacitor as close
as possible to the device between the VCC pin and the GND pin.
VIN AS AN ADJUSTABLE INPUT
Due to the low leakage nature of the VIN pin, the ADM8612 or
ADM8615 can be used as devices with an adjustable threshold. Use
an external resistor divider circuit to program the desired voltage
monitoring threshold based on the VIN threshold, as shown in
Figure 27.
Figure 27. ADM8615 Typical Application Circuit
TRANSIENT IMMUNITY
To avoid unnecessary resets caused by fast power supply transients,
an input glitch filter is added to the VCC pin of the ADM8611/
ADM8613/ADM8614 and the VIN pin of the ADM8612 and
ADM8615 to filter out the transient glitches on these pins.
Figure 16 shows the comparator overdrive (that is, the maximum
magnitude of negative going pulses with respect to the typical
threshold) vs. the pulse duration without a reset.
RESET OUTPUT
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
devices all have an active low, open-drain reset output. For the
ADM8611/ADM8613/ADM8614, the state of the output is
guaranteed to be valid as soon as VCC is greater than 0.9 V. For
the ADM8612 and ADM8615, the output is guaranteed to be
held low from when VCC = 0.9 V to when the device exits ULVO.
When the monitored voltage falls below its associated
threshold, RESET is asserted within 23 µs to 26 µs (typical).
Asserting RESET this quickly ensures that the entire system can
be reset at once before any part of the system voltage falls below its
recommended operating voltage. This system reset can avoid
dangerous and/or erroneous operation of a microprocessor-
based system.
MR
GND
ADM8611
RESET
GENERATOR
DEBOUNCE
RESET
VCC
VTH
12782-024
GND
WD_DISWDI
VCC
VTH
ADM8613
RESET
GENERATOR
RESET
WATCHDOG
DETECTOR
MR DEBOUNCE
12782-025
GND
WDI
VCC
VIN
VTH
ADM8615
RESET
GENERATOR
RESET
WATCHDOG
DETECTOR
MR DEBOUNCE
12782-026
ADM8615
MICROPROCESSOR
VCC
VIN
GND
RESET RESET
MR WDI OUTPUT
3.3V
12V V
IO
12782-127
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 13 of 17
MANUAL RESET INPUT
The ADM8611, ADM8612, ADM8613, and ADM8615 feature a
manual reset input (MR). Drive MR low to assert the reset output.
When MR transitions from low to high, the reset remains asserted
for the duration of the reset timeout period before deasserting.
The MR input has a 600 kΩ internal pull-up resistor so that the
input is always high when unconnected. To drive the MR input,
use an external signal or a push-button switch to ground; debounce
circuitry is integrated on-chip for this purpose. Noise immunity is
provided on the MR input, and fast, negative going transients of
up to 0.4 µs (typical) are ignored. If required, a 0.1 μF capacitor
between the MR pin and ground provides additional noise
immunity.
Figure 28. Manual Reset Timing
WATCHDOG TIMER
The ADM8613/ADM8614/ADM8615 feature a watchdog timer
that monitors microprocessor activity. A timer circuit is cleared
with every low to high or high to low logic transition on the watch-
dog input pin (WDI), which detects pulses as short as 85 ns. If
the timer counts through the preset watchdog timeout period (tWD),
a RESET output is asserted. The microprocessor must toggle the
WDI pin to avoid being reset. Failure of the microprocessor to
toggle the WDI pin within the timeout period indicates a code
execution error, and the reset pulse generated restarts the
microprocessor in a known state.
In addition to logic transitions on WDI, the watchdog timer
is also cleared by a reset assertion caused by an undervoltage
condition on the VCC pin, WDT_SEL toggling, or MR being
pulled low. When RESET is asserted, the watchdog timer is
cleared and does not begin counting again until the RESET
output is deasserted. The watchdog timer can be disabled by
driving the watchdog disable input (WD_DIS) high.
Figure 29. Watchdog Timer Timing
WATCHDOG TIMEOUT SELECT INPUT
Pulling the watchdog timeout select input (WDT_SEL) on the
ADM8614 high allows the device to extend its watchdog timeout
period from 1.6 sec (typical) to 100 sec (typical). This function
allows processors to have a long initialization time during startup.
The long timeout period also enables the processor to stay in
low power mode for a long period and work only intermittently,
reducing overall system power consumption.
TYPICAL APPLICATION CIRCUITS
Figure 30. ADM8611 Typical Application Circuit
Figure 31. ADM8612 Typical Application Circuit
Figure 32. ADM8613 Typical Application Circuit
Figure 33. ADM8614 Typical Application Circuit
VCC
RESET
MR
V
TH
t
RP
t
RP
MR EXT E RNALLY
DRIVE N LO W
t
D_MR
12782-027
0V
0V
VTH
VCC
WDI
RESET tRP tRP
tWD
12782-028
ADM8611
MICROPROCESSOR
VCC
GND
RESET RESET
MR
3.3V
V
CORE
12782-029
12782-030
ADM8612 MICROPROCESSOR
VCC
GND
RESET INPUT
MR
3.3V
VIO VCORE
VIN
0.8V
ADM8613
MICROPROCESSOR
VCC V
IO
WD_DIS
WDI
GND
RESET
MR
RESET
2.5V
OUTPUT
12782-031
ADM8614
VCC V
IO
WD_DIS
WDT_SEL
WDI
GND
RESET RESET
2.5V
OUTPUT
OUTPUT
OUTPUT
12782-032
MICROPROCESSOR
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 14 of 17
LOW POWER DESIGN TECHINQUES
With their ultralow power consumption level, the ADM8611/
ADM8612/ADM8613/ADM8614/ADM8615 are ideal for battery-
powered, low power applications where every bit of power matters.
In addition to using low power ICs, good circuit design practices
can help the user further reduce the overall system power loss.
Digital Inputs
The digital inputs of the ADM8611/ADM8612/ADM8613/
ADM8614/ADM8615 voltage supervisors are designed with
CMOS technology to minimize power consumption. The nature of
the CMOS structure leads to an increase of the device ICC, while
the voltage level on the input approaches its undefined logic range,
as shown in Figure 11. To minimize this effect, follow these
recommendations:
• If the digital input does not need to be toggled in a particular
design, tie it directly to the VCC or GND pin of the device.
• Push-pull outputs with logic high levels close to the VCC of the
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 are
the ideal choice for driving the digital signal line.
• Using push-pull outputs with a logic high level near the
minimum logic high specification of the digital input is
usually not recommended. One exception is if the input is
required to be driven high only infrequently for a relatively
short period.
• Open-drain outputs with a pull-up resistor to VCC can be
used to drive digital signal lines. Open-drain outputs are
best suited for driving lines that are required to be driven
low only infrequently for a relatively short period.
• The leakage current on both the digital input and the open-
drain output determines the size of the pull-up resistor
needed and, in turn, decides the power loss through the
resistor while driving the input low.
• The MR pin on the ADM8611, ADM8612, ADM8613, and
ADM8615 features an internal pull-up resistor. The infrequent
usage of this pin makes its power loss while driven to logic
low negligible.
WDI Input
When the watchdog input (WDI) is driven by a push-pull
input/output with a logic high level near the VCC level of the
ADM8613/ADM8614/ADM8615, neither a high nor a low input
logic causes the system to consume additional current. To reduce
the total current consumption, increase the speed of the input
transition to the number of transitions. One high to low or low
to high transition within the watchdog timeout period is sufficient
to prevent the watchdog timer from generating a reset output.
If the watchdog input is driven by a push-pull output with a logic
high level near the minimum logic high specification of the digital
input, then a logic high input may cause CMOS shoot through
and increase the bias current (ICC) of the ADM8613/ADM8614/
ADM8615. To minimize the power loss in this setup, use short
positive pulses to drive the WDI pin. The ideal pulse width is as
small as possible but greater than the required minimum pulse
width of the WDI input. One pulse within the watchdog timeout
period is sufficient to prevent the watchdog timer from generating
a reset output.
Figure 34. Using a Push-Pull Output with a Lower Logic High Level to VCC,
Driving the WDI Pin with Short Positive Pulse to Reduce ICC
Similarly, if an open-drain input/output with a pull-up resistor
to VCC is used to drive WDI, a logic low input causes additional
current flowing through the pull-up resistor. A short negative
pulse technique can minimize the long-term current consumption.
Figure 35. Short Negative Pulse on the WDI Pin to Reduce Leakage Current
Through the Pull-Up Resistor
WD_DIS Input
For the ADM8613 and ADM8614, the watchdog disable input
(WD_DIS) disables the watchdog function during system
prototyping or during power-up to allow extra time for
processor initialization.
To disable the watchdog timer function during power-up after a
reset deassertion, the processor configures its input/output and
drives WD_DIS high within the watchdog timeout period. If
there is not enough time to configure the input/output or if an
open-drain input/output is used to drive WD_DIS, an external
pull-up resistor is required to keep the watchdog function disabled
during power-up. Extra current is consumed through the pull-up
resistor to enable the watchdog function. The leakage current
on both WD_DIS and the input/output that drives it determines
the size of the pull-up resistor needed and, in turn, determines
the power loss through the resistor while driving the input low.
ADM8614 MICROPROCESSOR
VCC V
IO
WDI WATCHDOG
OUTPUT
2.5V 1.5V
HIGH
LOW
PUSH-PULL
OUTPUT
12782-033
ADM8614 MICROPROCESSOR
VCC
WDI
2.5V
HIGH
LOW
OPEN-DRAIN
OUTPUT
WATCHDOG
OUTPUT
12782-036
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 15 of 17
DEVICE MODEL OPTIONS
The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 include many device options; however, not all options are released for sale.
Released options are called standard models and are listed in the Ordering Guide. For the most up to date list of standard models, refer to
the Analog Devices website at www.analog.com/supervisory. Contact an Analog Devices sales representative for information on nonstandard
models, and be aware that samples and production units have long lead times.
Table 9. Selection Table
Device
Number
Low Voltage
Monitoring
Manual
Reset
Watchdog
Timer
Watchdog Disable
Input
Watchdog Timeout
Selection Input
ADM8611 No Yes No No No
ADM8612 Yes Yes No No No
ADM8613 No Yes Yes Yes No
ADM8614 No No Yes Yes Yes
ADM8615 Yes Yes Yes No No
Table 10. ADM8611 VCC Reset Threshold Voltage (VTH) Options (TA = −40°C to +85°C)
Reset Threshold Number Min Typ Max Unit
200 1.974 2 2.026 V
220 2.171 2.2 2.229 V
232 2.290 2.32 2.350 V
263 2.596 2.63 2.664 V
280 2.764 2.8 2.836 V
293 2.892 2.93 2.968 V
300 2.961 3 3.039 V
308 3.040 3.08 3.120 V
440
4.343
4.4
4.457
V
463 4.570 4.63 4.690 V
Table 11. ADM8612 and ADM8615 VIN Reset Threshold Voltage (VTH) Options (TA = −40°C to +85°C)
Reset Threshold Number Min Typ Max Unit
050 0.489 0.5 0.511 V
055 0.538 0.55 0.562 V
060 0.588 0.6 0.612 V
065
0.637
0.65
0.663
V
070 0.686 0.7 0.714 V
075 0.736 0.75 0.764 V
080 0.785 0.8 0.815 V
085 0.835 0.85 0.865 V
090 0.885 0.9 0.915 V
095 0.935 0.95 0.965 V
100 0.984 1 1.016 V
110 1.084 1.1 1.116 V
120 1.184 1.2 1.216 V
130 1.283 1.3 1.317 V
140 1.382 1.4 1.418 V
150 1.481 1.5 1.520 V
160 1.579 1.6 1.621 V
170 1.678 1.7 1.722 V
180 1.777 1.8 1.823 V
190 1.875 1.9 1.925 V
ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 Data Sheet
Rev. F | Page 16 of 17
Table 12. ADM8613 and ADM8614 VCC Reset Threshold Voltage (VTH) Options (TA = −40°C to +85°C)
Reset Threshold Number Min Typ Max Unit
232 2.290 2.32 2.350 V
263 2.596 2.63 2.664 V
293 2.892 2.93 2.968 V
308 3.040 3.08 3.120 V
463 4.570 4.63 4.690 V
Table 13. ADM8613 and ADM8615 Watchdog Timeout Options (TA = −40°C to +85°C)
Watchdog Timeout Period Code Min Typ Max Unit Test Condition/Comments
Y 1.4 1.6 1.9 sec WD_DIS low
Z 22.3 25.6 30.5 sec WD_DIS low
Table 14. ADM8614 Watchdog Timeout Options (TA = −40°C to +85°C)
Watchdog Timeout Period Code
Min
Typ
Max
Unit
Test Condition/Comments
Y 1.4 1.6 1.9 sec WD_DIS low, WDT_SEL low
87 100 119 sec WD_DIS low, WDT_SEL high
Table 15. Standard Models
Model Reset Threshold (V) Watchdog Timeout (sec)
ADM8611N263ACBZ-R7 2.63 N/A
ADM8611N293ACBZ-R7 2.93 N/A
ADM8612N110ACBZ-R7 1.1 N/A
ADM8613Y232ACBZ-R7 2.32 1.6
ADM8613Z232ACBZ-R7 2.32 25.6
ADM8614Y263ACBZ-R7 2.63 1.6
ADM8615Y100ACBZ-R7 1 1.6
ADM8615Z050ACBZ-R7 0.5 25.6
Figure 36. Ordering Code Structure
ADM861_ _ _ _ _A_ _Z-R7
GENE RIC NUMBE R
(1 T O 5)
WATCHDOG TIMEOUT PERIOD CODE
Y:1.6s (TYP)
Z: 25.6s (T Y P )
N: NO WATCH DOG FUNCTIO N
RESET T HRE S HOLD NUM BE R
(050 T O 463) TE M P ERATURE RANGE
A: –40° C TO + 85°C
PACKAGE DE S IG NATON
CB: W LCSP
Z = LEAD- FREE
PACKING MATERI AL
R7 = 7" TAP E AND RE E L
(3000 PIECE QUANTIT Y )
12782-037
Data Sheet ADM8611/ADM8612/ADM8613/ADM8614/ADM8615
Rev. F | Page 17 of 17
OUTLINE DIMENSIONS
Figure 37. 6-Ball Wafer Level Chip Scale Package [WLCSP]
(CB-6-17)
Dimensions shown in millimeters
ORDERING GUIDE
Model1, 2, 3 Temperature Range Package Description Package Option Marking Code
ADM8611N263ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 DJ
ADM8611N293ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 ES
ADM8612N110ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 DV
ADM8613Y232ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 DQ
ADM8613Z232ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 ED
ADM8614Y263ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 DR
ADM8615Y100ACBZ-R7
−40°C to +85°C
6-Ball Ball Wafer Level Chip Scale Package [WLCSP]
CB-6-17
DS
ADM8615Z050ACBZ-R7 −40°C to +85°C 6-Ball Ball Wafer Level Chip Scale Package [WLCSP] CB-6-17 EG
ADM8611-EVALZ Evaluation Board
ADM8612-EVALZ Evaluation Board
ADM8613-EVALZ Evaluation Board
ADM8614-EVALZ Evaluation Board
ADM8615-EVALZ Evaluation Board
1 Z = RoHS Compliant Part.
2 The ADM8611/ADM8612/ADM8613/ADM8614/ADM8615 include many device options; however, not all options are released for sale. Released options are called
standard models and are listed in the Ordering Guide. For the most up to date list of standard models, refer to the Analog Devices website at www.analog.com/supervisory.
Contact an Analog Devices sales representative for information on nonstandard models, and be aware that samples and production units have long lead times.
3 If ordering nonstandard models, complete the ordering code shown in Figure 36 by inserting the model number, reset threshold, and watchdog timeout.
08-25-2014-A
A
B
C
0.660
0.600
0.540
0.390
0.360
0.330
0.270
0.240
0.210
1.000
0.960
0.920
1.500
1.460
1.420
1
2
BOTTOM VIEW
(BALL SIDE UP)
TOP VIEW
(BALL SI DE DOW N)
SIDE VIEW
0.360
0.320
0.280
1.00
REF
0.50
BSC
BALLA1
IDENTIFIER
SEATING
PLANE
0.50 BSC
COPLANARITY
0.04
PKG-003299
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registered trademarks are the property of their respective owners.
D12782-0-2/18(F)