Datasheet

ADM6384
Rev. C | Page 10 of 12
APPLICATIONS INFORMATION
NEGATIVE-GOING V
CC
TRANSIENTS
To avoid unnecessary resets caused by fast power supply tran-
sients, the ADM6384 is equipped with glitch rejection circuitry.
The typical performance characteristic shown in Figure 10 plots
V
CC
transient duration vs. 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 µs typically does not
cause a reset, but if the transient is any greater in magnitude or
duration, a reset is generated. An optional 0.1 µF 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 out-
put, a resistor connected between
RESET
and ground pulls the
output low when it is unable to sink current. A large resistance
such as 100 kΩ should be used to avoid overloading the reset
output when V
CC
is above 1 V.
RESET
GND
ADM6384
100kΩ
05305-013
V
CC
Figure 13. Ensuring Reset Valid to V
CC
= 0 V