Voltage Monitoring Products
Spring 2005
CONTENTS
3-Lead Reset Generator Circuits . . 2
Analog Devices Applications Bulletin
ADI Launches Four New Watchdog Supervisory Families
in SOT-23 and SC70
4-Lead Reset Generators
with Manual Reset . . . . . . . . . . . . 3
Watchdog Supervisory Circuits . . . 4
Battery-Backup
Supervisory Circuits . . . . . . . . . . . 5
Super Sequencers™ . . . . . . . . . . . . 6
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Simple Sequencers™ . . . . . . . . . . . 7
Coming Soon:
New Low Power Reset and
Watchdog Supervisory Circuits . . . 8
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Family
Watchdog
Manual
Reset
Multiple
Timeouts
Low Voltage
Trip Points
ADM6316-ADM6322
✓
✓
✓
–
SOT-23-5
✓
–
–
SOT-23-5/SC70-5
–
✓
SOT-23-5
✓
✓
SC70-4
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ADM823-ADM825
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✓
ADM6821-ADM6825
✓
ADM8616-ADM8618
✓
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✓
–
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Packages
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Low Cost, Space Efficient, 3-Lead
Generator Circuits
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ADM803 Open-Drain Reset Generator
• Suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V
power supplies
A
nalog Devices offers a range of reset generator circuits
designed for use in microprocessor-based systems to monitor
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power supply voltage levels from 5 V down to 2.5 V. Their
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reset output signals are asserted whenever the supply voltage
falls
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below a preset threshold level. Reset remains active for a fixed
timeout period after the supply voltage has returned to a valid level,
so that the supply has time to stabilize before the microprocessor
starts up again. The various models provide a choice of active low or
active high and push-pull or open-drain output stages.
• 140 ms minimum reset timeout
• Active low open-drain reset output
• Low power consumption (17 A)
• Specified over –40°C to +125°C
• Available in 3-lead SC70 package
APPLICATIONS
• Microprocessor systems
• Computers
• Controllers
• Intelligent instruments
• Automotive systems
Part
Number
Reset Threshold Options (V)
Min
Timeout
(ms)
Reset Output Stage
Active Low
Active High
Package
Cross
Reference
ADM803
2.32, 2.63, 2.93, 3.08, 4.38, 4.63
140
Open-Drain
–
3-Lead SC70
ADM809
2.32, 2.63, 2.93, 3.08, 4.00,
4.38, 4.63
140
Push-Pull
–
3-Lead SOT-23/SC70 MAX809
ADM810
2.32, 2.63, 2.93, 3.08, 4.00,
4.38, 4.63
140
–
Push-Pull
3-Lead SOT-23/SC70 MAX810
ADM809-5
2.93, 4.63
30
Push-Pull
–
3-Lead SOT-23/SC70
ADM1810
4.35, 4.62
100
Push-Pull
–
3-Lead SOT-23/SC70 MXD1810
ADM1811
4.35, 4.62
100
5.5 k Pull-Up
–
3-Lead SOT-23/SC70 MXD1811
ADM1812
4.35, 4.62
100
–
Push-Pull
3-Lead SOT-23/SC70 MXD1812
ADM1813* 4.35, 4.62
100
5.5 k Pull-Up
–
3-Lead SOT-23/SC70 MXD1813
ADM1815
2.18, 2.31, 2.55, 2.88, 3.06
100
Push-Pull
–
3-Lead SOT-23/SC70 MXD1815
ADM1816
2.18, 2.31, 2.55, 2.88, 3.06
100
5.5 k Pull-Up
–
3-Lead SOT-23/SC70 MXD1816
ADM1817
2.18, 2.31, 2.55, 2.88, 3.06
100
–
Push-Pull
3-Lead SOT-23/SC70 MXD1817
ADM1818* 2.18, 2.31, 2.55, 2.88, 3.06
100
5.5 k Pull-Up
–
3-Lead SOT-23/SC70 MXD1818
ADM709
140
Push-Pull
–
DIP/SOIC
2.63, 2.93, 3.08, 4.40, 4.65
*The ADM1813 and ADM1818 also feature manual reset capability.
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MAX803
–
MAX709
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3
4-Lead Reset Generators with Manual Reset
T
he ADM811/ADM812, ADM6315, ADM6711/ADM6713, and
ADM6384 offer a manual reset input, allowing a user to safely reset a
microprocessor system by means of an external push-button switch.
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APPLICATIONS
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• Personal computers
ADM6711/ADM6713 Reset Generators
with Manual Reset in SC70
• Consumer electronics
• Suitable for monitoring 2.5 V, 3 V, 3.3 V,
and 5 V power supplies
• Handheld GPS units
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• Microcontroller-/
microprocessor-based systems
• Pocket PCs
• 140 ms minimum reset timeout
• Debounced manual reset input
• Active low push-pull reset output
(ADM6711)
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• Active low open-drain reset output
(ADM6713)
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• Low power consumption (12 A)
• Specified over –40°C to +125°C
• Available in 4-lead SC70 package
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ADM6384 Reset Generator with Manual
Reset in SC70
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• Suitable for monitoring 3 V, 3.3 V,
and 5 V power supplies
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• 140 ms minimum reset����������
timeout
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• Debounced manual reset input
• Active low push-pull reset output
• Specified over –40°C to +125°C
• Available in 4-lead SC70 package
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Part
Number
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Reset Threshold Options (V)
Min Timeout
(ms)
Reset Output Stage
Active Low
Active High
Package
Cross
Reference
ADM6384
4.63, 4.38, 3.08, 2.93, 2.63
140
Push-Pull
–
4-Lead SC70
MAX6384
ADM6711
2.32, 2.63, 2.93, 3.08. 4.38, 4.63
140
Push-Pull
–
4-Lead SC70
MAX6711
ADM6713
2.32, 2.63, 2.93, 3.08, 4.38, 4.63
140
Open-Drain
–
4-Lead SC70
MAX6713
ADM812
2.32, 2.63, 2.93, 3.08, 4.38, 4.63
140
–
Push-Pull
4-Lead SOT-143 MAX812
ADM811
2.32, 2.63, 2.93, 3.08, 4.38, 4.63
140
Push-Pull
–
4-Lead SOT-143 MAX811
300
Push-Pull
–
4-Lead SOT-143
1–1120
Open-Drain
–
4-Lead SOT-143 MAX6315
ADM811-3T 3.08
ADM6315
2.63, 2.93, 3.08, 4.39, 4.50, 4.63
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–
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4
Watchdog Supervisory Circuits
M
icroprocessors need to be reset when code execution errors occur, as well as when supply voltages fall to invalid levels. A watchdog
function can detect code execution errors by monitoring frequent logic transitions on a microprocessor’s output pin. If a transition
is not detected within a certain time period, the watchdog circuit will initiate a reset signal that will take the microprocessor out of
its invalid state. Many ADI reset generator watchdog circuits also feature a power fail detection comparator that asserts an active low signal
when the unregulated power supply voltage falls below a predetermined level. This power fail output can be used to generate a nonmaskable
interrupt, which allows the microprocessor to implement a shutdown procedure before power is lost.
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ADM8616 Watchdog Supervisory Circuits in
4-Pin SC70
• Wide range of trip points
• Low voltage operation: 1.58 V minimum
• Specified over –40C to +125C
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• 1 ms minimum reset timeout
• 4 watchdog timeout options
• Available in a 4-lead SC70 package
APPLICATIONS
• Microprocessor systems
• Computers
• Controllers
• Intelligent instruments
• Critical P monitoring
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ADM6316–ADM6322
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ADM823–ADM825
2.19-4.63
200
✓
–
SOT23-5, SC70-5 MAX823–MAX825
ADM6821–ADM6825
1.58-4.63
140
✓
–
SOT23-5
MAX6821–MAX6825
ADM8616–ADM8618
1.58-4.63
140
✓
–
SC70-4
–
ADM698–ADM699
4.65
140
–
–
DIP, SOIC
MAX698–MAX699
ADM705–ADM708
4.40, 4.65
160
✓
✓
DIP, SOIC
MAX705–MAX708
2.63
160
✓
✓
DIP, SOIC
MAX706P
ADM706R/
ADM706S/ADM706T,
ADM708R/
ADM708S/ADM708T
2.63-3.08
160
✓
✓
DIP, SOIC
MAX706R/
MAX706S/MAX706T,
MAX708R/
MAX708S/MAX708T
ADM1232(A)
4.37-4.62
250
✓
–
DIP, SOIC, MSOP
DS1232
ADM8698–ADM8699
4.65
140
–
–
DIP, SOIC
–
ADM9690
4.31
50, 60
–
–
SOIC
–
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Reset Threshold
(V)
Min Timeout
(ms)
Manual
Reset
Power Fail
Comparator
2.5-5
1
✓
–
SOT23-5
ADM706P
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Package
Cross Reference
MAX6316–MAX6322
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5
Battery-Backup Supervisory Circuits
ADM869x: Upgrade for Industry Standard ADM69X
I
n some computer applications, it is desirable
to provide battery-backup support for external
RAM, so that in the event of a power brownout,
a battery can supply power to the RAM unit
and data stored by the microprocessor can be
saved. In addition to providing precision voltage
monitoring, watchdog timing, and power fail
detection, many of our battery-backup parts can
control the chip enable status of external RAM
blocks to prevent a microprocessor from writing
erroneous data during power-up, power-down, and
brownout conditions.
• Lower power consumption (140 A)
• Faster gating of chip enable signals (3 ns)
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Part
Number
Reset
Threshold (V)
Min Timeout
(ms)
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Reset Output Stage
Active
Low
ADM690
4.65
35
Push-Pull
ADM690A
4.65
140
Push-Pull
ADM691
4.65
35 (adjustable)
ADM691A
4.65
140 (adjustable)
ADM692
4.40
ADM692A
Battery-
Chip
Backup Enable
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Active
Switch Gating
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Watchdog
Timeout
Package
Cross
Reference
–
✓
–
1.6
DIP/SOIC
MAX690
–
✓
–
1.6
DIP/SOIC/MSOP
MAX690A
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC
MAX691
Push-Pull
Open-Drain
✓
✓
0.1 (adjustable)
DIP/SOIC/TSSOP
MAX691A
35
Push-Pull
–
✓
–
1.6
DIP/SOIC
MAX692
4.40
140
Push-Pull
–
✓
–
1.6
DIP/SOIC
MAX692A
ADM693
4.40
35 (adjustable)
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC
MAX693
ADM693A
4.40
140 (adjustable)
Push-Pull
Open-Drain
✓
✓
0.1 (adjustable)
DIP/SOIC
MAX693A
ADM694
4.65
140
Push-Pull
–
✓
–
1.6
DIP/SOIC
MAX694
ADM695
4.65
140 (adjustable)
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC
MAX695
ADM696
1.3 (adjustable) 35 (adjustable)
Push-Pull
Push-Pull
✓
–
0.1 (adjustable)
DIP/SOIC
MAX696
ADM697
1.3 (adjustable) 35 (adjustable)
Push-Pull
Push-Pull
–
✓
0.1 (adjustable)
DIP/SOIC
MAX697
ADM800
4.40, 4.65
140 (adjustable)
Push-Pull
Open-Drain
✓
✓
0.1 (adjustable)
DIP/SOIC
MAX800
ADM802
4.40, 4.65
140
Push-Pull
–
✓
–
1.6
DIP/SOIC
MAX802
ADM805
4.40, 4.65
140
–
Push-Pull
✓
–
1.6
DIP/SOIC
MAX805
ADM8690
4.65
35
Push-Pull
–
✓
–
1.6
DIP/SOIC
–
ADM8691
4.65
35 (adjustable)
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC/TSSOP
–
ADM8692
4.40
35
Push-Pull
–
✓
–
1.6
DIP/SOIC
–
ADM8693
4.40
35 (adjustable)
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC/TSSOP
–
ADM8694
4.65
140
Push-Pull
–
✓
–
1.6
DIP/SOIC
–
ADM8695
4.65
140 (adjustable)
Push-Pull
Push-Pull
✓
✓
0.1 (adjustable)
DIP/SOIC
–
ADM8696
1.3 (adjustable) 35 (adjustable)
Push-Pull
Push-Pull
✓
–
0.1 (adjustable)
DIP/SOIC/TSSOP
–
ADM8697
1.3 (adjustable) 35 (adjustable)
Push-Pull
Push-Pull
–
✓
0.1 (adjustable)
DIP/SOIC/TSSOP
–
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6
ADM1062 to ADM1069: Multisupply Super Sequencers™ with Margining Control
T
he ADM1062 to ADM1069 family consists of configurable supervisory/sequencing devices that offer a single-chip solution for supply
monitoring and sequencing in multisupply systems. The ADM1062 to ADM1069 have up to 10 programmable supply voltage monitor
inputs. Voltages from 0.6 V to 14.4 V can be detected directly. Five of the inputs can also be configured as general-purpose logic inputs.
An on-chip 12-bit ADC allows readback of the supply voltages, offering an extra level of supply supervision. This can be used in a closedloop system with four or six on-chip DACs for supply voltage adjustment and margining.
The ADM1062 to ADM1069 family has a versatile, programmable state machine sequencing engine. 512 bytes of on-chip EEPROM is
available to store configuration parameters.
Features
Functional Block Diagram
• Up to 10 supply fault detector inputs with programmable
thresholds—1% accuracy
• Up to five general-purpose logic inputs
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• 10 fully programmable output drivers
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• Internal charge pump for high-side drive of N-channel FET
on six outputs
•
12-bit ADC monitors all supervised voltages
•
6 voltage-output DACs
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• Supply margining tools:
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• Flexible, programmable, state machine-based sequencing engine
• Industry standard SMBus Interface
• Internal and remote temperature sensing
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• LFCSP and TQFP package options
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Super Sequencers
Part
Number
Supervising
Accuracy
Sequencing
Voltage Readback
and Margining
Temperature
Sensing
ADM1060
±2.5%
Combinational Logic
7
9
–
–
ADM1062
±1%
State Machine
10
10
12-Bit ADC + 6 DACs
±2°C
40-Lead LFCSP/48-Lead TQFP
ADM1063
±1%
State Machine
10
10
12-Bit ADC
±2°C (2)
40-Lead LFCSP/48-Lead TQFP
ADM1064
±1%
State Machine
10
10
12-Bit ADC
–
40-Lead LFCSP/48-Lead TQFP
ADM1065
±1%
State Machine
10
10
–
–
40-Lead LFCSP/48-Lead TQFP
ADM1066
±1%
State Machine
10
10
12-Bit ADC + 6 DACs
–
40-Lead LFCSP/48-Lead TQFP
ADM1067
±1%
State Machine
10
10
6 DACs
–
40-Lead LFCSP/48-Lead TQFP
ADM1068
±1%
State Machine
8
8
–
–
32-Lead LFCSP/32-Lead TQFP
ADM1069
±1%
State Machine
8
8
12-Bit ADC + 4 DACs
–
32-Lead LFCSP/32-Lead TQFP
a
Monitor Enable
Inputs Outputs
Package
28-Lead TSSOP
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7
ADM1085 to ADM1088: Simple Sequencers™
T
he ADM1085 to ADM1088 Simple Sequencers provide an easy, yet powerful and flexible, solution to the problem of power supply
sequencing. They offer programmable time delays from 5 s to several seconds and can be cascaded in a variety of ways to give
sequencing of multiple power supplies. A choice of active-low or active-high outputs and push-pull or high voltage open-drain output
stages ensures compatibility with the widest possible range of voltage regulators and dc-to-dc converters. The ADM1085 to ADM1088 are
available in a tiny, 6-lead SC70 package.
Features
• Provide time delays between enabling of regulators
• Can be cascaded with regulators for multiple
supply sequencing
• Power supply monitoring from 0.6 V
• Output stages
•
High voltage (up to 22 V) open-drain output
(ADM1085/ADM1087)
•
Push-pull outputs (ADM1086/ADM1088)
• Fixed (5 s typ) or capacitor adjustable time delays
• Enable input
• Low power consumption (15 A)
• Specified over –40°C to +125°C temperature range
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Future Parts:
New Low Power Reset and Watchdog Supervisory Circuits
3-Pin and 4-Pin Reset Circuits
ADM8609: < 1 A, 3-Pin Reset Circuit in SOT-663
� • 1.39 V to 3.1 V Reset Trip Points
� • 140 ms Reset Timeout
ADM6328: 1 A, 3-Pin Reset Circuit in SOT-23 and SC70
� • 2.93 V Reset Trip Point
� • 100 ms Reset Timeout
� • Pin Compatible with MAX6328
ADM6804: 4 A, 4-Pin Manual Reset Circuit in SOT-143
� • 2.93 V Reset Trip Point
� • 100 ms Reset Timeout
� • Pin Compatible with MAX6804
ADM6444: 4-Pin Manual Reset Circuit in SOT-23
� • 1.58 V to 4.63 V Reset Trip Points
� • 140 ms Reset Timeout
� • 6.72 s Manual Reset Setup Period
� • Pin Compatible with MAX6444
For more information, email
supervisory@analog.com
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
Printed in the U.S.A.
B05114-30-1/05
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5-Pin Reset Circuits
ADM6306: 5-Pin Dual Manual Reset Circuit in SOT-23
� • 2.5 V to 5 V VCC Trip Points
� • 1.25 V RSTIN Trip Point
� • 1 ms to 1120 ms Reset Timeout Options
� • Pin Compatible with MAX6306
ADM8606: 5-Pin Dual Reset Circuit in SC70
� • 0.84 V to 1.4 V VCC1 Trip Points
� • 1.68 V to 2.93 V VCC2 Trip Points
� • 1 ms to 1120 ms Reset Timeout Options
6-Pin and 8-Pin Manual Reset and Watchdog Circuits
ADM8708: 6-Pin Manual Reset Circuit in SC70
� • 1.56 V to 4.63 V Trip Points
� • 1 ms to 1120 ms Reset Timeout Options
� • Manual Reset and 0.6 V Power Fail Comparator
ADM6706: 8-Pin Watchdog Supervisory Circuit in SOT-23
� • 2.19 V to 4.63 V Trip Points
� • 140 ms Reset Timeout
� • 1.6 s Watchdog Timeout
� • Manual Reset and 0.6 V Power Fail Comparator
Worldwide
Headquarters
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P.O. Box 9106
Norwood, MA
02062-9106 U.S.A.
Tel: 781.329.4700,
(1.800.262.5643,
U.S.A. only)
Fax: 781.326.8703
Analog Devices, Inc.
Europe
c/o Analog Devices SA
17–19, rue Georges Besse
Parc de Haute
Technologie d’Antony
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Antony Cedex, France
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Fax: 33.1.46.74.45.01
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Japan Headquarters
New Pier Takeshiba
South Tower Building
1-16-1 Kaigan,
Minato-ku, Tokyo
105-6891, Japan
Tel: 813.5402.8210
Fax: 813.5402.1063
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Headquarters
39/F One Pacific Place
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Admiralty,
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