TC1275 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC1275

3-Pin Reset Monitors for 3.3V Systems

Microchip Technology 

TC1275/TC1276/TC1277

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)

VCCTP(MIN)

tR

VCCTP(MAX)

VCCTP

VCC

RESET

tRPU1

VOH

FIGURE 3-2:

Timing Diagram – Power

Down (TC1275/TC1276)

tF

VCC

VCCTP(MAX)

VCCTP

VCCTP(MIN)

FIGURE 3-3:

Timing Diagram –

Power Up (TC1277)

tR

VCCTP(MIN)

VCCTP(MAX)

VCCTP

VCC

tRPU2

RESET

FIGURE 3-4:

VCC

VCCTP(MAX)

VCCTP

VOL

Timing Diagram –

Power Down (TC1277)

tF

VCCTP(MIN)

tRPD2

RESET

VOH

RESET SLEWS WITH VCC

RESET

tRPD1

VOL

DS21383B-page 4

© 2002 Microchip Technology Inc.

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