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MAX6822SUK-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6822SUK-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page Disable the watchdog function by leaving WDI uncon- nected or by three-stating the driver connected to WDI. The watchdog input is internally driven low during the first 7/8 of the watchdog timeout period and high for the last 1/8 of the watchdog timeout period. When WDI is left unconnected, this internal driver clears the 1.6s timer every 1.4s. When WDI is three-stated or unconnected, the maximum allowable leakage current is 10µA and the maximum allowable load capacitance is 200pF. Applications Information Watchdog Input Current The MAX6821/MAX6822/MAX6823/MAX6824 WDI inputs are internally driven through a buffer and series resistor from the watchdog timer (Figure 1). When WDI is left unconnected, the watchdog timer is serviced within the watchdog timeout period by a low-high-low pulse from the counter chain. For minimum watchdog input current (minimum overall power consumption), leave WDI low for the majority of the watchdog timeout period, pulsing it low-high-low once within the first 7/8 of the watchdog timeout period to reset the watchdog timer. If WDI is externally driven high for the majority of the timeout peri- od, up to 160µA can flow into WDI. Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the MAX6822 is open drain, it interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcon- troller’s RESET pin with a single pullup resistor allows either device to assert reset (see Figure 4). Negative-Going VCC Transients These supervisors are relatively immune to short-dura- tion, negative-going VCC transients (glitches), which usually do not require the entire system to shut down. Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer 6 _______________________________________________________________________________________ Figure 1. Functional Diagram Figure 2. Reset Timing Diagram VCC 1V 1V tRD VTH VTH tRD RESET GND RESET tRP tRP MAX6821– MAX6825 VCC VCC WDI (MAX6821– MAX6824) 1.26V GND RESET (MAX6821/MAX6824/ MAX6825) RESET (MAX6822 – MAX6825) MR (MAX6821/MAX6822/MAX6823, MAX6825) RESET GENERATOR WATCHDOG TIMER WATCHDOG TRANSITION DETECTOR |
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Similar Description - MAX6822SUK-T |
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