Microprocessor a Supervisory Circuits ADM8698/ADM8699 FEATURES FUNCTIONAL BLOCK DIAGRAM Superior Upgrade for ADM698/ADM699, MAX698/MAX699 Guaranteed RESET Assertion with V = 1 V CC ADM8698/ Low 70 mA Supply Current ADM8699 RESET* Precision 4.65 V Voltage Monitor V CC Power OK/Reset Time Delay RESET RESET Watchdog Timer GENERATOR Minimum Component Count 4.65V Performance Specified over Temperature WATCHDOG APPLICATIONS WATCHDOG WATCHDOG INPUT TRANSITION DETECTOR OUTPUT WDO* WDI* Microprocessor Systems (1 sec) Computers Controllers *WDI (ADM8699 ONLY) Intelligent Instruments RESET (SOIC ONLY) WDO (ADM8699 SOIC ONLY) Automotive Systems Critical mP Power Monitoring TYPICAL APPLICATION CIRCUIT +5V GENERAL DESCRIPTION The ADM8698/ADM8699 supervisory circuits provide power V m P POWER CC supply monitoring and watchdog timing for microprocessor RESET m P RESET systems. The ADM8698 monitors the 5 V V power supply and gener- CC ADM8698/ m P SYSTEM ADM8699 ates a RESET pulse during power up, power down and during low voltage Brown Out conditions. The RESET output is WDI* I/O LINE guaranteed to be functional (logic low) with V as low as 1 V. CC GND The ADM8699 features an identical monitoring circuit as in the ADM8698, plus an additional watchdog timer input to monitor *ADM8699 ONLY 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/SOIC and 16-lead SOIC packages. The 16-lead SOIC contains additional out- puts RESET (without inversion) and Watchdog Output WDO (ADM8699 only). 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or Tel: 617/329-4700 World Wide Web Site: ADM8698/ADM8699SPECIFICATIONS (V = +5 V 6 10%, T = T to T unless otherwise noted) CC A MIN MAX Parameter Min Typ Max Units Test Conditions/Comments V Operating Voltage Range 3.0 5.5 V CC Supply Current 70 100 A Power-Down Reset Assertion 4.5 4.65 4.75 V Power-Up Reset Deassertion Reset Threshold Hysteresis 40 mV Reset Active Time 140 200 280 ms Watchdog Timeout Period (ADM8699) 1.0 1.6 2.25 s Minimum WDI Input Pulse Width 50 ns V = 0.4, V = 0.8 (V ) IL IH CC RESET Output Voltage 0.4 V I = 3.2 mA, V = 4.4 V SINK CC RESET Output Voltage (V = 1 V) 12 200 mV I = 100 A, V = 1.0 V CC SINK CC 3.5 V I = 500 A, V = 5 V SOURCE CC RESET and WDO Output Voltage 0.4 V I = 3.2 mA, V = 5 V SINK CC 3.5 V I = 1 A, V = 4.4 V SOURCE CC RESET Output Short Circuit Current 45 mA Output Sink Current WDI Input Threshold (ADM8699) Logic Low 0.8 V Logic High 3.5 V WDI Input Current +1 +10 A WDI = V CC 10 1 A WDI = 0 V Specifications subject to change without notice. ABSOLUTE MAXIMUM RATINGS* ORDERING GUIDE (T = +25C unless otherwise noted) A Temperature Package V 0.3 V to +6 V CC Model Range Options* All Other Inputs . 0.3 V to V + 0.3 V CC Power Dissipation 8-Pin DIP 500 mW ADM8698AN 40C to +85C N-8 , Thermal Impedance +120C/W JA ADM8698ARW 40C to +85C R-16 Power Dissipation 16-Pin SOIC . 375 mW ADM8698ARN 40C to +85C R-8 , Thermal Impedance +110C/W JA ADM8699AN 40C to +85C N-8 Power Dissipation 8-Pin SOIC 500 mW ADM8699ARW 40C to +85C R-16 , Thermal Impedance +125C/W JA ADM8699ARN 40C to +85C R-8 Operating Temperature Range Industrial (A Version) . 40C to +85C *N = Plastic DIP R = Small Outline. Storage Temperature Range . 65C to +150C Lead Temperature (Soldering, 10 secs) +300C Vapor Phase (60 secs) . +215C Infrared (15 secs) . +220C ESD Rating .>4 kV *Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only 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. 2 REV. 0