TC1275 datasheet(4/12 Pages) MICROCHIP

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TC1275/TC1276/TC1277

DS21383B-page 4

3.0

APPLICATIONS INFORMATION

3.1

Operation – Power Monitor

The TC1275/TC1276/TC1277 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 200msec 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 (TC1275/TC1276)

FIGURE 3-2:

Timing Diagram – Power

Down (TC1275/TC1276)

FIGURE 3-3:

Timing Diagram –

Power Up (TC1277)

FIGURE 3-4:

Timing Diagram –

Power Down (TC1277)

VCCTP(MAX)

VCCTP(MIN)

VCCTP

VCC

RESET

tRPU1

VOH

VCC

RESET

VCCTP(MAX)

VCCTP

VCCTP(MIN)

VOL

tRPD1

tRPU2

VOL

VCCTP

VCC

RESET

VCCTP(MAX)

VCCTP(MIN)

tRPD2

VCC

VCCTP(MAX)

VOH

RESET

VCCTP

VCCTP(MIN)

RESET SLEWS WITH VCC

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