ADM699SQ
ADM699SQ Datasheet
GENERAL DESCRIPTION The ADM698/ADM699 supervisory circuits provide power supply monitoring and watchdog timing for microprocessor systems. The ADM698 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 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 .
| Part | Datasheet |
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ADM699SQ |
ADM699SQ (pdf) |
| Related Parts | Information |
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ADM698SQ |
ADM698SQ |
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| FEATURES Superior Upgrade for MAX698/MAX699 Guaranteed RESET Assertion with VCC = 1 V Low mA Supply Current Precision 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 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 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 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 . Microprocessor Supervisory Circuits ADM698/ADM699 FUNCTIONAL BLOCK DIAGRAM VCC 4.65V ADM698/ ADM699 RESET GENERATOR WATCHDOG INPUT WDI* WATCHDOG TRANSITION DETECTOR 1 sec RESET* RESET WATCHDOG OUTPUT WDO* *WDI ADM699 ONLY RESET SOIC ONLY WDO ADM699 SOIC ONLY TYPICAL APPLICATION CIRCUIT VCC RESET µP POWER µP RESET ADM698/ ADM699 WDI* µP SYSTEM I/O LINE *ADM699 ONLY 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 617/329-4700 Fax 617/326-8703 = +5 V 10%, TA = TMIN to TMAX unless otherwise noted Parameter Units Test Conditions/Comments VCC Operating Voltage Range Supply Current Power-Down Reset Assertion Power-Up Reset Deassertion Reset Threshold Hysteresis Reset Active Time Watchdog Timeout Period ADM699 Minimum WDI Input Pulse Width RESET Output Voltage RESET Output Voltage VCC = 1 V RESET and WDO Output Voltage RESET Output Short Circuit Current TA = +25°C, VCC = +5 V TA = +25°C, VCC = +5 V VIL = VIH = V ISINK = mA, Vcc = V ISINK = 10 µA, VCC = V ISOURCE = 1 µA, VCC = 5 V ORDERING GUIDE Temperature Range to +85°C to +85°C to +85°C to +125°C to +85°C to +85°C to +85°C to +125°C Package Option N-8 R-16 Q-8 Q-8 N-8 R-16 Q-8 Q-8 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. WARNING! ESD SENSITIVE DEVICE PIN FUNCTION DESCRIPTION Mnemonic Function VCC GND RESET RESET WDO +5 V Power Supply Input. 0 V. Ground reference for all signals. Logic Output. RESET goes low whenever VCC falls below the reset voltage threshold V typ . RESET remains low for a minimum of 140 ms after VCC returns to 5 V. RESET also goes low for a minimum of 140 ms if the watchdog timer is enabled but not serviced within its timeout period. Watchdog Input. WDI is a three level input. If WDI remains either high or low for longer than the watchdog timeout period, RESET pulses low and WDO goes low. The timer resets with each transition on the WDI line. The watchdog timer may be disabled if WDI is left floating or is driven to midsupply. SOIC packages only Logic Output. RESET is an active high output. It is the inverse of RESET. SOIC ADM699 only Logic Output. The Watchdog Output, WDO, goes low if WDI remains either high or low for longer than the watchdog timeout period. WDO is set high by the next transition at WDI. If WDI is unconnected or at midsupply, the watchdog timer is disabled and WDO remains high. TYPICAL PERFORMANCE CURVES 100 90 ADM698/ADM699 PIN CONFIGURATION DIP VCC 1 VCC 2 GND 3 GND 4 ADM698/ ADMO699 TOP VIEW Not to Scale 8 GND 7 RESET 6 NC WDI * * ADM699 ONLY PIN CONFIGURATION SOIC GND 1 16 RESET ATDOPMV6IE9W8/ NAoDt tMo S6c9a9le RESET NC WDO * GND 4 TOP VIEW 13 NC NC 5 Not to Scale 12 NC 11 NC WDI * 10 NC 9 GND |
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