TC1278 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC1278

3-Pin Reset Monitors for 5V Systems

Microchip Technology 

TC1278/TC1279

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)

4.00V

tR

4.75V

VCCTP

VCC

RESET

tRPU1

VOH

FIGURE 3-2:

Timing Diagram –

Power Down (TC1279)

tF

VCC

4.75V

VCCTP

4.00V

FIGURE 3-3:

Timing Diagram –

Power Up (TC1278)

tR

VCCTP(MIN)

VCCTP(MAX)

VCCTP

VCC

tRPU2

RESET

VOL

FIGURE 3-4:

VCC

4.74V

VCCTP

Timing Diagram –

Power Down (TC1278)

tF

4.00V

tRPD2

RESET

VOH

RESET SLEWS WITH VCC

RESET

tRPD1

VOL

DS21384B-page 4

© 2002 Microchip Technology Inc.

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