ADM1232A View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADM1232A

Microprocessor Supervisory Circuit

Analog Devices 

a

FEATURES

Superior Upgrade for MAX1232 and Dallas DS1232

Low Power Consumption (500 ␮A max)

Adjustable Precision Voltage Monitor with +4.5 V and

+4.75 V Options

Adjustable STROBE Monitor with 150 ms, 600 ms or

1.2 sec Options

No External Components

Fast (20 ns) Strobe Pulsewidth

APPLICATIONS

Microprocessor Systems

Portable Equipment

Computers

Controllers

Intelligent Instruments

Automotive Systems

Protection Against Damage Caused by ␮P Failure

Microprocessor

Supervisory Circuit

ADM1232A

FUNCTIONAL BLOCK DIAGRAM

VCC

TOLERANCE

PB RESET

5%/10%

TOLERANCE

SELECT

VREF

DEBOUNCE

TD

GND

WATCHDOG

TIMEBASE

SELECT

RESET

GENERATOR

WATCHDOG

TIMER

ADM1232A

RESET

RESET

STROBE

GENERAL DESCRIPTION

The ADM1232A is a superior, pin-compatible upgrade for the

MAX1232 and the DS1232LP and DS1232. The ADM1232A

can detect strobe pulsewidths as narrow as 20 ns, making it

compatible with high speed microprocessors. The Analog

Devices ADM1232A is a microprocessor monitoring circuit

that can monitor:

1. Microprocessor Supply Voltage.

2. Whether a Microprocessor has locked up.

3. An External Interrupt.

The ADM1232A is available in four different packages:

1. The ADM1232AARM in an 8-lead µSOIC (RM-8).

2. The ADM1232AAN in an 8-lead PDIP (N-8).

3. The ADM1232AARW in a 16-lead wide SOIC (R-16).

4. The ADM1232AARN is an 8-lead narrow SOIC (R-8).

+5V

+5V

10k⍀

ADM1232A

ADM1232

STRROEBSET

GND TD

SRTERSOEBTE

TTOOLLEERRAANNCCEE

MICROPROCESSOR

I/O

RESET

Figure 1. Typical Supply Monitoring Application

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

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