CAT1232LPW-T2 datasheet(1/12 Pages) CATALYST

部件名	CAT1232LPW-T2

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

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制造商	CATALYST [Catalyst Semiconductor]

网页	http://www.catalyst-semiconductor.com

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CAT1232, CAT1832

5V and 3.3V Supply Monitor, Watchdog Timer,

Manual Reset, with Active High & Low Resets

FEATURES

Selectable reset voltage tolerance

— CAT1232LP for 5V supply

— CAT1832 for 3.3V supply

Selectable watchdog period:

150ms, 600ms or 1.2s

Two reset outputs

— Active high, push-pull reset output

— Active low, open-drain reset output

(CAT1232LP)

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

Debounced manual push-button reset

Compact SOIC and MSOP packages

For Ordering Information details, see page 11.

APPLICATIONS

Microprocessor Systems

Portable Equipment

Controllers

Single Board Computers

Instrumentations

Telecommunications

FUNCTIONAL DIAGRAM

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 microprocessor 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 1.2s. 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.

ST

RESET

PBRST

40kΩ

TOL

VCC

–

+

Reference

VCC

RESET

TD

Push Button Debounce

Watchdog Timebase Selection

Reset &

Watchdog Timer

(CAT1232LP)

Watchdog Transition Detector

RESET

(CAT1832)

Tolerance Selection

1

Doc. No. MD-3018 Rev. D

Characteristics subject to change without notice

类似零件编号 - CAT1232LPW-T2

制造商	部件名	数据表	功能描述
ON Semiconductor	CAT1232LPW-T2	604Kb / 12P	5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets Doc. No. MD-3018 Rev. F

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类似说明 - CAT1232LPW-T2

制造商	部件名	数据表	功能描述
Catalyst Semiconductor	CAT1232LP	179Kb / 12P	5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets
ON Semiconductor	CAT1232LP	604Kb / 12P	5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets Doc. No. MD-3018 Rev. F
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Linear Technology	LTC2930	179Kb / 12P	Confi gurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset
Catalyst Semiconductor	CAT1232LP	117Kb / 9P	5V and 3.3V Supply Voltage Monitor and Reset Circuit
Linear Technology	LTC2930	169Kb / 12P	Confi gurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset