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AME8520 Arkusz danych(PDF) 10 Page - Analog Microelectronics

Numer części AME8520
Szczegółowy opis  Micropower uP Watch Dog Timer
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Producent  AME [Analog Microelectronics]
Strona internetowa  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME8520 Arkusz danych(HTML) 10 Page - Analog Microelectronics

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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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