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ADM698AN Datasheet(PDF) 3 Page - Analog Devices |
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ADM698AN Datasheet(HTML) 3 Page - Analog Devices |
3 / 4 page ADM698/ADM699 REV. 0 –3– PIN FUNCTION DESCRIPTION Mnemonic Function VCC +5 V Power Supply Input. GND 0 V. Ground reference for all signals. RESET Logic Output. RESET goes low whenever VCC falls below the reset voltage threshold (4.65 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 time- out period. WDI 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. RESET (SOIC packages only) Logic Output. RESET is an active high output. It is the inverse of RESET. WDO (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. PIN CONFIGURATION (DIP) 1 2 3 4 8 7 6 5 TOP VIEW (Not to Scale) O TOP VIEW (Not to Scale) ADM698/ ADM699 VCC VCC GND GND GND NC (WDI) * NC *( ) ADM699 ONLY RESET PIN CONFIGURATION (SOIC) 1 2 3 4 16 15 14 13 TOP VIEW (Not to Scale) O 5 12 6 11 710 89 TOP VIEW (Not to Scale) ADM698/ ADM699 GND VCC VCC GND NC NC NC NC RESET NC NC NC (WDI) * NC GND RESET NC (WDO) * *( ) ADM699 ONLY TYPICAL PERFORMANCE CURVES 4.70 4.68 4.66 4.64 4.62 20 40 60 80 100 120 POWER UP POWER DOWN VCC = +5V TEMPERATURE – °C Figure 3. RESET Voltage Threshold vs. Temperature 215 210 205 200 195 20 40 60 80 100 120 TEMPERATURE – °C VCC = +5V Figure 2. RESET Active Time vs. Temperature 10 90 100 0% 1V A4 500ms 3.36 V 1V Figure 1. RESET Output Voltage vs. VCC |
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