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FM1233D

3-Pin µC Supervisor Circuit

Fairchild Semiconductor 

February 2003

FM1233D

3-Pin µC Supervisor Circuit

General Description

The FM1233D is a supervisor circuit that monitors a micropro-

cessor power supply or other system voltage and issues a reset

pulse when a fault condition exists. Several different threshold

voltages are offered to accommodate 5V systems with different

tolerances.

The device features a precision temperature-compensated volt-

age reference and comparator. When VCC falls to the threshold

voltage, a RESET pulse is issued, holding the output in the

active state. When power rises above VTH, the reset remains for

approximately 250 ms to allow the system clock and other cir-

cuits to stabilize. The reset output of FM1233D is of open-drain

active low type.

Features

s Precision monitoring of 5V and lower voltage microprocessor

systems

s VTH values of 4.62V, 4.38V and 4.12V

s Automatic restart of microprocessor after power failure

s 140ms (min) power-on RESET delay (typ.: 256ms)

s Internal 5kΩ pull-up resistor

s Other reset choices available: 32 to 128ms

s Operating Temperature -40°C to +105°C

s SOT23-3 package

Typical Operating Circuit

VCC

GND

Connection Diagram

3

FM1233D

1

2

RESET

Controller

GND 1

FM1233D 3 VCC

RESET 2

SOT23-3 Package

©2002 Fairchild Semiconductor Corporation

1

FM1233D Rev. D

www.fairchildsemi.com

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