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MCP131-475I/TO Datasheet(PDF) 14 Page - Microchip Technology

tên linh kiện MCP131-475I/TO
Nội dung chi tiết  Micropower Voltage Supervisors
tải về  28 Pages
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MCP102/103/121/131
DS20001906D-page 14
 2004-2014 Microchip Technology Inc.
4.2
Negative Going VDD Transients
The minimum pulse width (time) required to cause a
reset
may
be
an
important
criterion
in
the
implementation of a Power-on Reset (POR) circuit.
This time is referred to as transient duration, defined as
the amount of time needed for these supervisory
devices to respond to a drop in VDD. The transient
duration time is dependent on the magnitude of VTRIP
VDD. Generally speaking, the transient duration
decreases with increases in VTRIP –VDD.
Figure 4-3 shows a typical transient duration versus
reset
comparator
overdrive,
for
which
the
MCP102/103/121/131 will not generate a reset pulse. It
shows that the farther below the trip point of the
transient pulse goes, the shorter the duration of the
pulse required to cause a reset gets. Figure 2-32
shows the transient response characteristics for the
MCP102/103/121/131.
A 0.1 µF bypass capacitor, mounted as close as
possible to the VDD pin, provides additional transient
immunity (refer to Figure 4-1).
FIGURE 4-3:
Example of Typical
Transient Duration Waveform.
4.3
Reset Power-up Timer (tRPU)
Figure 4-4 illustrates the device’s current states. While
the system is powering down, the device has a low
current. This current is dependent on the device VDD
and trip point. When the device VDD rises through the
voltage trip point (VTRIP), an internal timer starts. This
timer consumes additional current until the RST pin is
driven (or released) high. This time is known as the
Reset Power-up Time (tRPU). Figure 4-4 shows when
tRPU is active (device consuming additional current).
FIGURE 4-4:
Reset Power-up Timer
Waveform.
4.3.1
EFFECT OF TEMPERATURE ON
RESET POWER-UP TIMER (TRPU)
The Reset Power-up timer time-out period (t
RPU)
determines how long the device remains in the reset
condition. This is affected by both VDD and temperature.
Typical responses for different VDD values and
temperatures are shown in Figures 2-26, 2-27 and 2-28.
Time (µs)
0V
5V
VTRIP(MIN) -VDD
tTRANS
VTRIP(MAX)
VTRIP(MIN)
VTRIP
VDD
RST
tRPU
Reset Power-up
Timer Inactive
Reset
Power-up
Timer
Inactive
See Figures 2-1,
2-2 and 2-3
See Figures 2-4,
2-5 and 2-6
See Figures 2-1,
2-2 and 2-3



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