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111899

FEATURES

Automatically restarts microprocessor after

power failure

Monitors pushbutton for external override

Internal circuitry debounces pushbutton

switch

to an in-tolerance condition or pushbutton

released

Accurate 5%, 10% or 15% microprocessor 5V

power supply monitoring

Reduces need for discrete components

Precision temperature-compensated voltage

reference and voltage sensor

Low-cost TO-92 package or surface-mount

SOT-223 package

Internal 5k

Ω=pull-up resistor

Operating temperature of -40

°C to +85°C

PIN ASSIGNMENT

PIN DESCRIPTION

PIN 1

GROUND

PIN 2

RESET

PIN 3

PIN 4

GROUND (SOT-223 ONLY)

DESCRIPTION

The DS1233 EconoReset monitors two vital conditions for a microprocessor: power supply and external

override. A precision temperature compensated reference and comparator circuit are used to monitor the

the reset signal is kept in the active state for approximately 350 ms to allow the power supply and

processor to stabilize. The second function of the DS1233 is pushbutton reset control. The DS1233

debounces a pushbutton closure and will generate a 350 ms reset pulse upon release.

OPERATION - POWER MONITOR

The DS1233 provides the functions of detecting out-of-tolerance power supply conditions and warning a

processor-based system of impending power failure.

for approximately 350 ms after the power supply has reached the selected tolerance. This allows the

DS1233

5V EconoReset

www.dalsemi.com

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TO-92 PACKAGE

See Mech.

Drawings Section

2

3

4

SOT-223 PACKAGE

See Mech.

Drawings Section

1

DALLAS

DS1233

Econo

Reset