CAT1232LPY-GT2 datasheet(1/12 Pages) CATALYST

Part #	CAT1232LPY-GT2

Description	5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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Characteristics subject to change without notice

1

Doc. No. 25089, Rev. 0C

5V and 3.3V Supply Monitor, Watchdog Timer,

Manual Reset, with Active High & Low Resets

CAT1232LP/CAT1832

FEATURES

s Selectable reset voltage tolerance

— CAT1232LP for 5V supply

— CAT1832 for 3.3V supply

s Selectable watchdog period:

150ms, 600ms or 1.2 sec

s Two reset outputs

— Active high, push-pull reset output

— Active low, open-drain reset output

(CAT1232LP)

— Active low, push-pull reset output (CAT1832)

s Debounced manual push-button reset

s Compact SOIC and MSOP packages

DESCRIPTION

The CAT1232LP and CAT1832 microprocessor

supervisors can halt and restart a “hung-up” or “stalled”

microprocessor, restart a microprocessor after a power

failure, and debounce a manual/push-button micro-

processor reset switch. The devices are drop in

replacements for the Maxim/Dallas Semiconductor

DS1232LP and DS1832 supervisors

Precision reference and comparator circuits monitor the

5V or 3.3V system power supply voltage, VCC. During

power-up or when the power supply falls outside

selectable tolerance limits, both the RESET and

RESET

become active. After the power supply voltage rises

above the RESET threshold voltage, the reset signals

remain active for a minimum of 250ms, allowing the

power supply and system processor to stabilize. The

trip-point tolerance input, TOL, selects the trip level

tolerance to be either 5% or 10% for the CAT1232LP 5V

supply and 10% or 20% for the CAT1832 3.3V supply.

Each device has a push-pull, active HIGH reset output.

The CAT1232LP also has an open drain, active LOW

reset output while the CAT1832 also has a push-pull,

active LOW reset output.

A debounced manual reset input activates the reset

outputs and holds them active for a minimum period of

250ms after being released.

Also included is a watchdog timer to reset a

microprocessor that has stopped due to a software or

hardware failure. Three watchdog time-out periods are

selectable: 150ms, 600ms and 1.2sec. If the

ST input is

not strobed low before the watchdog time out period

expires, the reset signals become active for a minimum

of 250ms.

APPLICATIONS

s Microprocessor Systems

s Portable Equipment

s Controllers

s Single Board Computers

s Instrumentations

s Telecommunications

FUNCTIONAL DIAGRAM

ST

RESET

PBRST

40k

Ω

TOL

VCC

–

+

Reference

VCC

RESET

TD

Push Button Debounce

Watchdog Timebase Selection

Reset &

Watchdog Timer

(CAT1232LP)

Watchdog Transition Detector

RESET

(CAT1832)

Tolerance Selection

For Ordering Information details, see page 11.

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