TC1232_13 datasheet(7/20 Pages) MICROCHIP

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 2002-2012 Microchip Technology Inc.

Preliminary

DS21370D-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

VCC

+4.25V

VCC

+4.25V

+4.75V

VCC = 5V

+4.5V (5% Trip Point)

+4.25V (10% Trip Point)

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

VOL

VOH

tRPU

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