 2003 Microchip Technology Inc.

DS21382B-page 5

TC1272/TC1273/TC1274

4.0

APPLICATIONS INFORMATION

4.1

Operation – Power Monitor

The TC1272/TC1273/TC1274 is designed to function

as a voltage monitor for +5V systems. These devices

dropped below a preset voltage level that is selected by

the suffix part number. In addition, the RESET is held

active for approximately 200 ms after the power supply

has risen above the voltage threshold level to allow

time for the power supply to stabilize before system

operation commences.

FIGURE 4-1:

Timing Diagram – Power Up

(TC1272/TC1273).

FIGURE 4-2:

Timing Diagram – Power

Down (TC1272/TC1273).

FIGURE 4-3:

Timing Diagram – Power Up

(TC1274).

FIGURE 4-4:

Timing Diagram –

Power Down (TC1274).

RESET

RESET

RESET

RESET