ANALOG DEVICES ADM8616, ADM8617 Service Manual

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Low Voltage Supervisory Circuits

FEATURES

Precision 1.8 V to 5 V power supply monitoring

RESET

9

4

3 watchdog timeout options

RESET

Low power consumption (5 μA)
Guaranteed reset output valid to V
Power supply glitch immunity
Specified over −40°C t
4-lead SC70 package

APPLICATIONS

Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment

threshold options

1.58 V to 4.63 V
RESET

timeout options

1 ms, 20 ms, 140 ms, 1120 ms

6.3 ms, 102 ms, 1.6 sec

output stages
Push-pull active-low (ADM8616)
Open-drain active-low (ADM8617)

o +85°C temperature range

= 1 V

CC

with Watchdog in 4-Lead SC70

ADM8616/ADM8617

FUNCTIONAL BLOCK DIAGRAM

V

CC

ADM8616

V

REF

RESET

GENERATOR

WATCHDOG

DETECT OR

GND WDI

Figure 1.

V

CC

RESET

4795-001

GENERAL DESCRIPTION

The ADM8616/ADM8617 are supervisory circuits that monitor
power supply voltage levels and code execution integrity in
microprocessor-based systems. A power-on reset signal is
generated when the supply voltage rises to a preset threshold
level. The ADM8616/ADM8617 have an on-chip watchdog
timer that can reset the microprocessor if it fails to strobe
within a preset timeout period.

Each part is available in the following nine reset threshold

ptions: 1.58 V, 1.67 V, 2.19 V, 2.32 V, 2.63 V, 2.93 V, 3.08 V,

o

4.38 V, and 4.63 V. There are four reset timeout options: 1 ms,
20 ms, 140 ms, and 1120 ms. There are also three possible
watchdog timeouts available: 6.3 ms, 102 ms, and 1.6 sec.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

The parts differ in terms of reset output configuration. The
AD

M8616 is active-low with a push-pull output, while the

ADM8617 is active-low with an open-drain output.

The ADM8616/ADM8617 are available in 4-lead SC70 packages

nd typically consume only 5 μA, making them suitable for use

a
in low power, portable applications.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

ADM8616/ADM8617

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TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics ............................................. 6

REVISION HISTORY

1/07—Rev. A to Rev. B

Changes to Functional Block Diagram.......................................... 1

11/06—Rev. 0 to Rev. A

Changes to Ordering Guide.......................................................... 10

6/05—Revision 0: Initial Version

Circuit Description............................................................................8

RESET Output ...............................................................................8

Watchdog Input.............................................................................8

Application Information...................................................................9

Watchdog Input Current ..............................................................9

Negative-Going V

Ensuring RESET Valid to V

Watchdog Software Considerations............................................9

Outline Dimensions....................................................................... 10

Ordering Guide .......................................................................... 10

Transients...................................................9

CC

= 0 V...........................................9

CC

Rev. B | Page 2 of 12

ADM8616/ADM8617

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SPECIFICATIONS

VCC = full operating range, TA = −40oC to +85oC, unless otherwise noted.

Table 1.

Parameter Min Typ Max Unit Test Conditions/Comments

SUPPLY

VCC Operating Voltage Range 1 5.5 V
Supply Current 10 20 μA VCC = 5.5 V
5 12 μA VCC = 3.6 V

RESET THRESHOLD VOLTAGE

ADM861xL
ADM861xM
ADM861xT
ADM861xS
ADM861xR
ADM861xZ
ADM861xY
ADM861xW

ADM861xV
RESET THRESHOLD TEMPERATURE COEFFICIENT

RESET THRESHOLD HYSTERESIS

RESET TIMEOUT PERIOD

ADM861xxA 1 1.4 2 ms

ADM861xxB 20 28 40 ms

ADM861xxC 140 200 280 ms

ADM861xxD 1120 1600 2240 ms
VCC TO RESET DELAY

RESET OUTPUT VOLTAGE

VOL (Open-Drain and Push-Pull) 0.3 V VCC ≥ 1.0 V, I

0.3 V VCC ≥ 1.2 V, I

0.3 V VCC ≥ 2.7 V, I

0.4 V VCC ≥ 4.5 V, I

VOH (Push-Pull Only) 0.8 × VCC V VCC ≥ 2.7 V, I

RESET Rise Time

Open-Drain RESET Output Leakage Current

WATCHDOG INPUT

Watchdog Timeout Period

ADM861xxxW 4.3 6.3 9.3 ms
ADM861xxxX 71 102 153 ms

ADM861xxxY 1.12 1.6 2.4 sec
WDI Pulse Width 50 ns VIL = 0.3 × VCC, V
WDI Input Threshold V

VIL 0.3 × VCC

VIH 0.7 × VCC V
WDI Input Current 120 160 μA V

4.50 4.63 4.75 V

4.25 4.38 4.50 V

3.00 3.08 3.15 V

2.85 2.93 3.00 V

2.55 2.63 2.70 V

2.25 2.32 2.38 V

2.12 2.19 2.25 V

1.62 1.67 1.71 V

1.52 1.58 1.62 V
40 ppm/°C

2 × V

mV

TH

40 μs V

falling at 1 mV/μs

CC

= 50 μA

SINK

= 100 μA

SINK

= 1.2 mA

SINK

= 3.2 mA

SINK

= 500 μA

SOURCE

VCC − 1.5

V VCC ≥ 4.5 V, I

5 25 ns From 10% to 90% V

SOURCE

= 800 μA

, CL = 5 pF, VCC = 3.3 V

CC

1 μA

= 0.7 × VCC

IH

= VCC

WDI

−20 −15

μA V

WDI

= 0

Rev. B | Page 3 of 12

ADM8616/ADM8617

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ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

Table 2.

Parameter Rating
VCC

RESET

Output Current (RESET)
Operating Temperature Range

Storage Temperature Range
θJA Thermal Impedance, SC70 146°C/W

Soldering Temperature

Sn/Pb 240°C, 30 sec
Pb-Free 260°C, 40 sec

−0.3 V to +6 V

−0.3 V to +6 V

20 mA

−40°C to +85°C

−65°C to +150°C

Stresses above those listed under Absolute Maximum Ratings
ma

y cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

ESD CAUTION

Rev. B | Page 4 of 12