TC1278 datasheet(4/12 Pages) MICROCHIP

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TC1278/TC1279

DS21384B-page 4

3.0

APPLICATIONS INFORMATION

3.1

Operation – Power Monitor

The TC1278/TC1279 provide the function of detecting

out-of-tolerance power supply conditions and warning

a processor-based system of impending power failure.

When VCC is detected as out-of-tolerance, the RESET

signal is asserted. On power-up, RESET is kept active

for approximately 350msec after the power supply has

reached the selected tolerance. This allows the power

supply and microprocessor to stabilize before RESET

is released.

FIGURE 3-1:

Timing Diagram –

Power Up (TC1279)

FIGURE 3-2:

Timing Diagram –

Power Down (TC1279)

FIGURE 3-3:

Timing Diagram –

Power Up (TC1278)

FIGURE 3-4:

Timing Diagram –

Power Down (TC1278)

4.75V

4.00V

VCCTP

VCC

RESET

tRPU1

VOH

VCC

RESET

4.75V

VCCTP

4.00V

VOL

tRPD1

tRPU2

VOL

VCCTP

VCC

RESET

VCCTP(MAX)

VCCTP(MIN)

tRPD2

VCC

4.74V

VOH

RESET

VCCTP

4.00V

RESET SLEWS WITH VCC

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