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ADM6384 Datasheet

  • ADM6384

  • Microprocessor Supervisory Circuit in 4-Lead SC70

  • 536.86KB

  • 13頁

  • AD

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ADM6384
APPLICATION INFORMATION
NEGATIVE-GOING V
CC
TRANSIENTS
To avoid unnecessary resets caused by fast power supply
transients, the ADM6384 is equipped with glitch rejection
circuitry. The typical performance characteristic in Figure 10
plots V
CC
transient duration versus the transient magnitude.
The curves show combinations of transient magnitude and
duration for which a reset is not generated for 4.63 V and
2.93 V reset threshold parts. For example, with the 2.93 V
threshold, a transient that goes 100 mV below the threshold
and lasts 8 渭s typically does not cause a reset, but if the transient
is any bigger in magnitude or duration, a reset is generated. An
optional 0.1 渭F bypass capacitor mounted close to V
CC
provides
additional glitch rejection.
ENSURING RESET VALID TO V
CC
= 0 V
Both active-low and active-high reset outputs are guaranteed to
be valid for V
CC
as low as 1 V. However, by using an external
resistor with push-pull configured reset outputs, valid outputs
for V
CC
as low as 0 V are possible. For an active-low reset
output, a resistor connected between RESET and ground pulls
the output low when it is unable to sink current. A large
resistance such as 100 k惟 should be used so that it does not
overload the reset output when V
CC
is above 1 V.
V
CC
ADM6384
RESET
100k惟
05305-013
GND
Figure 13. Ensuring Reset Valid to V
CC
= 0 V
Rev. 0 | Page 10 of 12

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