CAT1832Z ON Semiconductor, CAT1832Z Datasheet

CAT1832Z

Manufacturer Part Number

CAT1832Z

Description

Supervisory Circuits 3.3 V

Manufacturer

ON Semiconductor

Datasheet

1.CAT1832V-GT3.pdf (12 pages)

Specifications of CAT1832Z

Number Of Voltages Monitored

Monitored Voltage

3.3 V, 5 V

Undervoltage Threshold

2.8 V, 2.47 V

Output Type

Active Low, Push-Pull

Manual Reset

Resettable

Watchdog

Battery Backup Switching

No Backup

Supply Voltage (max)

5.5 V

Supply Voltage (min)

1 V

Supply Current (typ)

35 uA

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

MSOP-8

Minimum Operating Temperature

- 40 C

Power Fail Detection

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 12
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5 V and 3.3 V Supply Monitor, Watchdog Timer,

Manual Reset, with Active High & Low Resets

FEATURES

APPLICATIONS

FUNCTIONAL DIAGRAM

Characteristics subject to change without notice

For Ordering Information details, see page 11.

Selectable reset voltage tolerance

— CAT1232LP for 5 V supply

— CAT1832 for 3.3 V supply

Selectable watchdog period:

150 ms, 600 ms or 1.2 s

Two reset outputs

— Active high, push-pull reset output

— Active low, open-drain reset output

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

Debounced manual push-button reset

Compact SOIC and MSOP packages

Microprocessor Systems

Portable Equipment

Controllers

Single Board Computers

Instrumentations

Telecommunications

(CAT1232LP)

PBRST

TOL

40kΩ

Tolerance Selection

Watchdog Timebase Selection

Watchdog Transition Detector

Push Button Debounce

Reference

–

DESCRIPTION

The CAT1232LP

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

Semiconductor DS1232LP and DS1832 supervisors

Precision reference and comparator circuits monitor

the 5 V or 3.3 V system power supply voltage, V

During power-up or when the power supply falls

outside selectable tolerance limits, both the RESET

and RESET

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 5 V supply and 10% or 20% for the

CAT1832 3.3 V supply.

Each device has a push-pull, active HIGH reset

output.

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

250 ms 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: 150 ms, 600 ms and 1.2 s. If the ST

is not strobed low before the watchdog time out period

expires, the reset signals become active for a

minimum of 250 ms.

Watchdog Timer

Reset &

¯¯¯¯¯¯ become active. After the power supply

The CAT1232LP also has an open drain,

replacements

CAT1232LP, CAT1832

and CAT1832

for

(CAT1232LP)

(CAT1832)

the

RESET

Doc. No. MD-3018 Rev. F

microprocessor

Maxim/Dallas

¯¯ input

Related parts for CAT1832Z

CAT1832Z Summary of contents

Page 1

V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets FEATURES Selectable reset voltage tolerance — CAT1232LP for 5 V supply — CAT1832 for 3.3 V supply Selectable watchdog period: 150 ms, 600 ...

Page 2

CAT1232LP, CAT1832 PIN CONFIGURATION SOIC 8 Lead MSOP 8 Lead PDIP 8 Lead ¯¯¯¯¯¯ PBRST CAT ¯¯¯¯¯¯ TOL 3 6 RESET GND 4 5 RESET PIN DESCRIPTION Pin Number Pin Number 8-Lead 16-Lead ...

Page 3

ELECTRICAL CHARACTERISTICS Unless otherwise stated, 1 All voltages are referenced to ground. Symbol Parameter V Supply Voltage CC I Supply Current CC1 ¯¯¯¯¯¯ Input High ST and PBRST V IH Level ¯¯¯¯¯¯ Input Low ST and ...

Page 4

CAT1232LP, CAT1832 TYPICAL CHARACTERISTICS For the CAT1232LP and T CC Threshold Voltage vs. Temperature (10% TOL) 4.450 4.445 TOL = Vcc (10%) 4.440 4.435 4.430 -50 0 TEMPERATURE (°C) Supply Current vs. Temperature 40 Vcc = ...

Page 5

APPLICATION INFORMATION SUPPLY VOLTAGE MONITOR Reset Signal Polarity and Output Stage Structure ¯¯¯¯¯¯ active LOW signal developed with RESET an open drain driver in the CAT1232LP. A pull-up resistor is required, typical values are 10 kΩ ...

Page 6

CAT1232LP, CAT1832 ¯¯ INPUT WATCHDOG TIMER AND ST A watchdog timer stops and restarts a microprocessor that has stopped proper operation or become “hung”. The watchdog performs this function by monitoring the ¯¯ input. After the reset outputs go inactive ...

Page 7

PACKAGE OUTLINE DRAWINGS (1)(2) SOIC 16-Lead 300 mils (W) D PIN #1 IDENTIFICATION TOP VIEW b e SIDE VIEW Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-013. © 2009 SCILLC. All rights reserved. Characteristics subject to ...

Page 8

CAT1232LP, CAT1832 (1)(2) PDIP 8-Lead 300mils (L) PIN # 1 IDENTIFICATION D TOP VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-001. Doc. No. MD-3018 Rev. F SYMBOL ...

Page 9

MSOP 8-Lead ( TOP VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187. © 2009 SCILLC. All rights reserved. Characteristics subject to change ...

Page 10

CAT1232LP, CAT1832 (1)(2) SOIC 8-Lead 150mils (V) PIN # 1 IDENTIFICATION TOP VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. Doc. No. MD-3018 Rev. F SYMBOL A ...

Page 11

... CAT1232LPV-GT3 CAT1232LPZ-GT3 CAT1232LPW-T2 CAT1832L-G CAT1832V-GT3 CAT1832Z-GT3 Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) The device used in the above example is a CAT1232LPV-GT3 (SOIC 8-Lead, NiPdAu, Tape & Reel). (4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. ...

Page 12

... Update Sample of Ordering Information Update Package Outline Drawings Update Example of Ordering Information 13-Nov-07 D Change document number from 25088, Rev. OC Change logo and fine print to ON Semiconductor 06-Nov-08 E Update Example of Ordering Information 09-Mar- Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein ...

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