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MAX6371 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6371 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page Pin-Selectable Watchdog Timers 6 _______________________________________________________________________________________ • Watchdog Timeout Period: Normal operating watchdog timeout period after the initial startup delay. A watchdog output pulse is asserted if a valid watch- dog input transition is not received before the timeout period elapses. Eight pin-selectable timeout period options for each device, from 30µs to 60s. Pin-selectable watchdog timer disable feature. • Watchdog Output/Timing Options: Open drain, active low with 100ms minimum watch- dog output pulse (MAX6369/MAX6371/MAX6373). Push-pull, active low with 1ms minimum watchdog output pulse (MAX6370/MAX6372/MAX6374). Each device has a watchdog startup delay that is initi- ated when the supervisor is first powered or after the user modifies any of the logic control set inputs. The watchdog timer does not begin to count down until the VCC WDI WDO tSETUP tDELAY tWD tWD tWD tWDO A B C D E F G TRANSITIONS ON WDI IGNORED DURING SETUP DELAY. TRANSITION(S) ON WDI IGNORED DURING STARTUP DELAY PERIOD. WATCHDOG TIMER STARTS AFTER STARTUP DELAY AND WDO IS DEASSERTED. TRANSITION OCCURS BEFORE WATCHDOG TIMEOUT PERIOD. WATCHDOG TIMER CLEARS AND STARTS TIMER AGAIN. WATCHDOG TIMES OUT, WDO ASSERTS. TRANSITIONS ON WDI IGNORED WHEN WDO ASSERTED. WATCHDOG TIMER STARTS AFTER WDO DEASSERTS. A AB C D EF G E Figure 2. Watchdog Timing WATCHDOG TIMER CIRCUITRY TRANSITION DETECTOR ENABLE SET WATCHDOG TIMEOUT SET STARTUP DELAY MAX6369–MAX6374 EN CONTROL LOGIC SET 2 SET 1 SET 0 VCC GND CLEAR WDO OUT WDI OUTPUT Figure 1. Functional Diagram |
Similar Part No. - MAX6371 |
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Similar Description - MAX6371 |
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