Analog Devices ADM698SQ, ADM698AR, ADM698AQ, ADM698AN, ADM699SQ Datasheet

Microprocessor

RESET

GENERATOR

4.65V

V

CC

WATCHDOG

INPUT

WDI

*

ADM698/
ADM699

RESET

WATCHDOG
OUTPUT WDO

*

RESET

*

*

WDI (ADM699 ONLY)
RESET (SOIC ONLY)
WDO (ADM699 SOIC ONLY)

WATCHDOG

TRANSITION DETECTOR

(1 sec)

*

ADM699 ONLY

+5V

V

CC

WDI

*

GND

ADM698/

ADM699

RESET

µP POWER

µP SYSTEM

I/O LINE

µP RESET

a

FEATURES
Superior Up
Guaranteed
Low 0.6 mA Supply Current
Precision 4.65 V Voltage Monitor
Power OK/Reset Time Delay
Watchdog Timer
Minimum Component Count
Performance Specified over Temperature

APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical mP Power Monitoring

GENERAL DESCRIPTION

The ADM698/ADM699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.

The ADM698 monitors the 5 V V
ates a

RESET pulse during power up, power down and during
low voltage “Brown Out” conditions. The
guaranteed to be functional (logic low) with V

The ADM699 features an identical monitoring circuit as in the
ADM698 plus an additional watchdog timer input to monitor
microprocessor activity. The
watchdog input is not toggled within the 1 second watchdog
timeout period.

Both parts are available in 8-pin plastic DIP and 16-lead SOIC
packages. The 16-lead SOIC contains additional outputs
RESET (without inversion) and Watchdog Output WDO
(ADM699 only).

grade for MAX698/MAX699

RESET Assertion with VCC = 1 V

power supply and gener-

CC

RESET output is

as low as 1 V.

CC

RESET output is forced low if the

Supervisory Circuits

ADM698/ADM699

FUNCTIONAL BLOCK DIAGRAM

TYPICAL APPLICATION CIRCUIT

REV. 0

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

ADM698/ADM699–SPECIFICATIONS

WARNING!

ESD SENSITIVE DEVICE

(VCC = +5 V 6 10%, TA = T

MIN

to T

unless otherwise noted)

MAX

Parameter Min Typ Max Units Test Conditions/Comments

VCC Operating Voltage Range 3.0 5.5 V
Supply Current 0.6 1.95 mA

Power-Down Reset Assertion 4.5 4.65 4.73 V
Power-Up Reset Deassertion 4.73 V
Reset Threshold Hysteresis 40 mV
Reset Active Time 140 200 280 ms T

Watchdog Timeout Period (ADM699) 1.0 1.6 2.25 s T

= +25°C, V

A

= +25°C, V

A

= +5 V

CC

= +5 V

CC

Minimum WDI Input Pulse Width 50 ns VIL = 0.4, VIH = 3.5 V

RESET Output Voltage 0.4 V I
RESET Output Voltage (VCC = 1 V) 4 200 mV I

3.5 V I

RESET and

WDO Output Voltage 0.4 V I

3.5 V I

= 1.6 mA, Vcc = 4.4 V

SINK

= 10 µA, V

SINK

= 1 µA, V

SOURCE

= 1.6 mA, VCC = 5 V

SINK

= 1 µA, V

SOURCE

= 1.0 V

CC

CC

CC

= 5 V

= 4.4 V

RESET Output Short Circuit Current 25 mA Output Sink Current

WDI Input Threshold (ADM699)

Logic Low 0.8 V
Logic High 3.5 V

WDI Input Current 20 50 µA WDI = V

CC

, T

A

= +25°C

–50 –20 µA WDI = 0 V, TA = +25°C

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

All Other Inputs . . . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.3 V

CC

Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . . . 500 mW

θ

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +120°C/W

JA

Power Dissipation 16-Pin SOIC . . . . . . . . . . . . . . . . . 375 mW

θ

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +110°C/W

JA

Model Range Option

ADM698AN –40°C to +85°C N-8
ADM698AR –40°C to +85°C R-16
ADM698AQ –40°C to +85°C Q-8
ADM698SQ –55°C to +125°C Q-8

ORDERING GUIDE

Temperature Package

Power Dissipation 8-Pin Cerdip . . . . . . . . . . . . . . . . . . 500 mW

θ

, Thermal Impedance . . . . . . . . . . . . . . . . . . . . +125°C/W

JA

Operating Temperature Range

Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C

Extended (S Version) . . . . . . . . . . . . . . . . .–55°C to +125°C

ADM699AN –40°C to +85°C N-8
ADM699AR –40°C to +85°C R-16
ADM699AQ –40°C to +85°C Q-8
ADM699SQ –55°C to +125°C Q-8

Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300°C

Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215°C

Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C

*Stresses above those listed under “Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only and functional operation of
the device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods of time may affect device reliability.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADM698/ADM699 features proprietary ESD protection circuitry, permanent
damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.

–2–

REV. 0