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FEATURES Superior Upgrade for ADM698/ADM699, MAX698/MAX699 Guaranteed RESET Assertion with VCC = 1 V Low 70 A Supply ...
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FEATURES Superior Upgrade for ADM698/ADM699, MAX698/MAX699 Guaranteed RESET Assertion with VCC = 1 V Low 70 A 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 P Power Monitoring
VCC
Microprocessor Supervisory Circuits ADM8698/ADM8699
FUNCTIONAL BLOCK DIAGRAM
ADM8698/ ADM8699
RESET GENERATOR 4.65V RESET*
RESET
WATCHDOG INPUT WDI*
WATCHDOG TRANSITION DETECTOR (1 sec)
WATCHDOG OUTPUT WDO*
*WDI (ADM8699 ONLY)
RESET (SOIC ONLY) WDO (ADM8699 SOIC ONLY)
TYPICAL APPLICATION CIRCUIT
+5V
GENERAL DESCRIPTION
The ADM8698/ADM8699 supervisory circuits provide power supply monitoring and watchdog timing for microprocessor systems. The ADM8698 monitors the 5 V VCC power supply and generates 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 ADM8699 features an identical monitoring circuit as in the ADM8698, 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/SOIC and 16-lead SOIC packages. The 16-lead SOIC contains additional outputs RESET (without inversion) and Wa...