Voltage Monitoring Products - Analog · PDF fileADM800 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

CONTENTS 3-Lead Reset Generator Circuits . . 2

4-Lead Reset Generatorswith Manual Reset . . . . . . . . . . . . 3

Watchdog Supervisory Circuits . . . 4

Battery-BackupSupervisory Circuits . . . . . . . . . . . 5

Super Sequencers™ . . . . . . . . . . . . 6

Simple Sequencers™ . . . . . . . . . . . 7

Coming Soon: New Low Power Reset and Watchdog Supervisory Circuits . . . 8

ADI Launches Four New Watchdog Supervisory Families in SOT-23 and SC70

Voltage Monitoring Products

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A n a l o g D e v i c e s A p p l i c a t i o n s B u l l e t i n

Visit our website for samples, data sheets, and additional product information.

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Spring 2005

Family Watchdog ManualReset

MultipleTimeouts

Low Voltage Trip Points

Packages

ADM6316-ADM6322 ✓ ✓ ✓ – SOT-23-5

ADM823-ADM825 ✓ ✓ – – SOT-23-5/SC70-5

ADM6821-ADM6825 ✓ ✓ – ✓ SOT-23-5

ADM8616-ADM8618 ✓ – ✓ ✓ SC70-4

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Low Cost, Space Efficient, 3-Lead Reset Generator Circuits

Analog Devices offers a range of reset generator circuits designed for use in microprocessor-based systems to monitor power supply voltage levels from 5 V down to 2.5 V. Their

reset output signals are asserted whenever the supply voltage falls 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.

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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

• 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

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Part Number

Reset Threshold Options (V) Min Timeout

(ms)

Reset Output Stage Package Cross Reference

Active Low Active High

ADM803 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 140 Open-Drain – 3-Lead SC70 MAX803

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 2.63, 2.93, 3.08, 4.40, 4.65 140 Push-Pull – DIP/SOIC MAX709

*The ADM1813 and ADM1818 also feature manual reset capability.

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ADM6711/ADM6713 Reset Generators with Manual Reset in SC70

• Suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V power supplies


• Debounced manual reset input

• Active low push-pull reset output (ADM6711)

• Active low open-drain reset output (ADM6713)




4-Lead Reset Generators with Manual Reset

The 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.

ADM6384 Reset Generator with Manual Reset in SC70

• Suitable for monitoring 3 V, 3.3 V, and 5 V power supplies


• Debounced manual reset input

• Active low push-pull reset output



APPLICATIONS

• Personal computers

• Consumer electronics

• Microcontroller-/microprocessor-based systems

• Handheld GPS units

• Pocket PCs

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Part Number

Reset Threshold Options (V) Min Timeout (ms)

Reset Output Stage Package Cross ReferenceActive Low Active High

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

ADM811-3T 3.08 300 Push-Pull – 4-Lead SOT-143 –

ADM6315 2.63, 2.93, 3.08, 4.39, 4.50, 4.63 1–1120 Open-Drain – 4-Lead SOT-143 MAX6315

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Watchdog Supervisory Circuits

Microprocessors 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.

APPLICATIONS

• Microprocessor systems

• Computers

• Controllers

• Intelligent instruments

• Critical P monitoring

ADM8616 Watchdog Supervisory Circuits in 4-Pin SC70

• Wide range of trip points

• Low voltage operation: 1.58 V minimum

• Specified over –40C to +125C


• 4 watchdog timeout options

• Available in a 4-lead SC70 package

Family Reset Threshold (V)

Min Timeout (ms)

Manual Reset

Power Fail Comparator

Package Cross Reference

ADM6316–ADM6322 2.5-5 1 ✓ – SOT23-5 MAX6316–MAX6322

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

ADM706P 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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Battery-Backup Supervisory Circuits

In 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.

ADM869x: Upgrade for Industry Standard ADM69X

• 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)

Reset Output Stage Battery-Backup Switch

Chip Enable Gating

Watchdog Timeout

Package Cross ReferenceActive

LowActive High

ADM690 4.65 35 Push-Pull – ✓ – 1.6 DIP/SOIC MAX690

ADM690A 4.65 140 Push-Pull – ✓ – 1.6 DIP/SOIC/MSOP MAX690A

ADM691 4.65 35 (adjustable) Push-Pull Push-Pull ✓ ✓ 0.1 (adjustable) DIP/SOIC MAX691

ADM691A 4.65 140 (adjustable) Push-Pull Open-Drain ✓ ✓ 0.1 (adjustable) DIP/SOIC/TSSOP MAX691A


ADM692A 4.40 140 Push-Pull – ✓ – 1.6 DIP/SOIC MAX692A


ADM693A 4.40 140 (adjustable) Push-Pull Open-Drain ✓ ✓ 0.1 (adjustable) DIP/SOIC MAX693A



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 –


ADM8693 4.40 35 (adjustable) Push-Pull Push-Pull ✓ ✓ 0.1 (adjustable) DIP/SOIC/TSSOP –


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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Super Sequencers

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ADM1062 to ADM1069: Multisupply Super Sequencers™ with Margining Control

The 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 closed-loop 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• Up to 10 supply fault detector inputs with programmable

thresholds—1% accuracy

• Up to five general-purpose logic inputs

• 10 fully programmable output drivers

• Internal charge pump for high-side drive of N-channel FET on six outputs

• Flexible, programmable, state machine-based sequencing engine

• Supply margining tools:

• 12-bit ADC monitors all supervised voltages

• 6 voltage-output DACs

• Industry standard SMBus Interface

• Internal and remote temperature sensing

• LFCSP and TQFP package options

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Functional Block Diagram

Part Number

Supervising Accuracy

Sequencing Monitor Inputs

Enable Outputs

Voltage Readback and Margining

Temperature Sensing

Package

ADM1060 ±2.5% Combinational Logic 7 9 – – 28-Lead TSSOP

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

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ADM1085 to ADM1088: Simple Sequencers™ADM1085 to ADM1088: Simple Sequencers™ADM1085 to ADM1088: Simple Sequencers

The 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


• Specified over –40°C to +125°C temperature range

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Worldwide HeadquartersOne Technology WayP.O. Box 9106Norwood, MA02062-9106 U.S.A.Tel: 781.329.4700,(1.800.262.5643,U.S.A. only) Fax: 781.326.8703

Analog Devices, Inc.Europec/o Analog Devices SA17–19, rue Georges BesseParc de HauteTechnologie d’AntonyF-92182 Antony Cedex, FranceTel: 33.1.46.74.45.00Fax: 33.1.46.74.45.01

Analog Devices, Inc.Japan HeadquartersNew Pier TakeshibaSouth Tower Building1-16-1 Kaigan,Minato-ku, Tokyo 105-6891, JapanTel: 813.5402.8210Fax: 813.5402.1063

Analog Devices, Inc.Southeast Asia Headquarters39/F One Pacific Place88 QueenswayAdmiralty,Hong Kong, PRCTel: 852.2.506.9336Fax: 852.2.506.4755

© 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

For more information, email [email protected]

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 TimeoutADM6328: 1 A, 3-Pin Reset Circuit in SOT-23 and SC70� • 2.93 V Reset Trip Point� • 100 ms Reset Timeout� • Pin Compatible with MAX6328ADM6804: 4 A, 4-Pin Manual Reset Circuit in SOT-143� • 2.93 V Reset Trip Point� • 100 ms Reset Timeout� • Pin Compatible with MAX6804ADM6444: 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

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 MAX6306ADM8606: 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 ComparatorADM6706: 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

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Documents

Voltage Monitoring Products - Analog · PDF fileADM800 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