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10 / 13 page AME, Inc. 10 Micropower µµµµµP Watch Dog Timer AME8510 / 8520 / 8530 n Detailed Description(contd.) Watchdog Input Current The watchdog input pin (WDI) typically sources/sinks 8 µA when driven high or low. So from a power dissipa- tion point of view the duty cycle of the waveform at WDI is unimportant. When the WDI pin is floating or tri-stated the power supply current falls to less than 3.0 µA. Glitch Rejection The AME8510/8520/8530 family will reject negative go- ing transients on the V DD line to some extent. The smaller the duration of the transient the larger its amplitude may be without triggering a reset. The “Glitch Rejection” chart in the graphs section of this datasheet shows the rela- tion between glitch amplitude and allowable glitch dura- tion to avoid unintended resets. Accurate Output State at Low V DD With V DD voltage on the order of the MOS transistor threshold (<1.0V) the outputs of the AME8510/8520/8530 may become undefined. For parts with active low output (RESETB) a resistor placed between RESETB and GND on the order of 100K Ω will ensure that the RESETB out- put stays low when V DD is lower than the threshold volt- age of the part. In a like manner a resistor on the order of 100K Ω when placed between RESET and V DD will en- sure parts with active high output (RESET) will remain high when V DD is lower than the threshold voltage of the part. |
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