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ADM698AN-ADM698AR-ADM699AN-ADM699AR
Microprocessor Supervisory Circuits
REV.0
Microprocessor
Supervisory Circuits
FUNCTIONAL BLOCK DIAGRAM
TYPICAL APPLICATION CIRCUIT
FEATURES
Superior Upgrade for MAX698/MAX699
Guaranteed RESET Assertion with VCC = 1 V
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 DESCRIPTIONThe ADM698/ADM699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.
The ADM698 monitors the 5 V VCC power supply and gener-
ates a RESET pulse during power up, power down and during
low voltage “Brown Out” conditions. The RESET output is
guaranteed to be functional (logic low) with VCC as low as 1 V.
The ADM699 features an identical monitoring circuit as in the
ADM698 plus an additional watchdog timer input to monitor
microprocessor activity. The RESET output is forced low if 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).
ADM698/ADM699–SPECIFICATIONSSpecifications subject to change without notice.
(VCC = +5 V 6 10%, TA = TMIN to TMAX unless otherwise noted)
ORDERING GUIDE
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V 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.
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +6 V
All Other Inputs . . . . . . . . . . . . . . . . . . .–0.3 V to VCC + 0.3 V
Power Dissipation 8-Pin DIP . . . . . . . . . . . . . . . . . . . .500 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .+120°C/W
Power Dissipation 16-Pin SOIC . . . . . . . . . . . . . . . . .375 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .+110°C/W
Power Dissipation 8-Pin Cerdip . . . . . . . . . . . . . . . . . .500 mW
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . .+125°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . .–40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . . . .–55°C to +125°C
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.
PIN FUNCTION DESCRIPTION
PIN CONFIGURATION (DIP)
VCC
VCC
GND
GND
GND
NC (WDI)*
*( ) ADM699 ONLY
RESET
PIN CONFIGURATION (SOIC)
GND
VCC
VCC
GND
RESET
NC (WDI)*
GND
RESET
NC (WDO)*
*( ) ADM699 ONLY
TYPICAL PERFORMANCE CURVES
RESET VOLTAGE THRESHOLD – V
TEMPERATURE – °C
RESET ACTIVE TIME – msFigure 2.RESET Active Time vs. TemperatureAAAAAAAAAAAAAAAAAAAAAAAAA
Figure 1.RESET Output Voltage vs. VCC
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