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TC1232 Datenblatt(PDF) 7 Page - Microchip Technology

Teilenummer TC1232
Bauteilbeschribung  Microprocessor Monitor
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2005 Microchip Technology Inc.
Preliminary
DS21370C-page 7
TC1232
4.0
OPERATIONAL DESCRIPTION
4.1
Power Monitor
The TC1232 provides the function of warning the
processor of a power failure. When VCC is detected as
being below the voltage levels defined by the TOL pin,
the TC1232’s comparator outputs the RST and RST
signals to a logic level that warns the system of an out-
of-tolerance power supply. The RST and RST signals
switch at a threshold value of 4.5V if TOL is tied to VCC,
and at a value of 4.75 volts if TOL is grounded. The
RST and RST signals are held active for a minimum of
250 ms to ensure that the power supply voltage has
been stabilized.
Figure 4-1 shows the VCC fall time.
Figure 4-2 shows the VCC rise time.
Figure 4-3 shows the time from when the voltage trip
point is detected to the reset output pin going active.
Figure 4-4 shows the time from when the voltage trip
point is exited to the reset output pin going inactive.
FIGURE 4-1:
Power-Down Slew Rate.
FIGURE 4-2:
Power-up Slew Rate.
FIGURE 4-3:
VCC Detect Reset Output
Delay (Power-Down).
FIGURE 4-4:
VCC Detect Reset Output
Delay (Power-Up).
+4.75V
tF
VCC
+4.25V
tR
VCC
+4.25V
+4.75V
VCC = 5V
+4.5V (5% Trip Point)
+4.25V (10% Trip Point)
RST
RST
VOL
VOH
tRPD
VCC SLEW RATE = 1.66 mV/µs (0.5V/300 µs)
VCC
4.6V (5% Trip Point)
4.5V(10% Trip Point)
RST
RST
VOL
VOH
tRPU


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