Microprocessor Supervisory Circuit ADM1232A FEATURES FUNCTIONAL BLOCK DIAGRAM Precision 5 V voltage monitor with 5% or 10% tolerance options 5%/10% V RESET CC TOLERANCE STROBE Adjustable monitor with 150 ms, 600 ms, or 1.2 sec TOLERANCE SELECT options STROBE VREF Fast (20 ns) pulse width RESET No external components required PB RESET DEBOUNCE Packaged in 8-Lead SOIC WATCHDOG WATCHDOG STROBE TD TIMER Specified from 40C to +85C TIMEBASE SELECT GND ADM1232A APPLICATIONS Figure 1. Microprocessor systems Portable equipment Computers Controllers Intelligent instruments Automotive systems Protection against damage caused by microprocessor failure GENERAL DESCRIPTION 5V 5V The ADM1232A is pin-compatible to the MAX1232, DS1232LP, 10k and DS1232. The ADM1232A can detect strobe pulse widths as narrow as 20 ns, making it compatible with high speed ADM1232A MICROPROCESSOR microprocessors. The Analog Devices, Inc., ADM1232A is a STROBE I/O microprocessor monitoring circuit that monitors micro- RESET RESET processor supply voltage. It can also detect if a microprocessor GND TD TOLERANCE has locked up or an external interrupt has been issued. The ADM1232A is available in an 8-lead narrow body SOIC and is specified over the 40C to +85C temperature range. Figure 2. Typical Supply Monitoring Application Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 19992009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. RESET GENERATOR 00061-002 00061-001ADM1232A TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions ..............................5 Applications ....................................................................................... 1 Circuit Information ...........................................................................6 Functional Block Diagram .............................................................. 1 PB RESET .......................................................................................6 General Description ......................................................................... 1 STROBE Timeout Selection .........................................................6 Revision History ............................................................................... 2 TOLERANCE ................................................................................6 Specif icat ions ..................................................................................... 3 RESET RESET and Outputs .........................................................6 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ..........................................................................7 ESD Caution .................................................................................. 4 Ordering Guide .............................................................................7 REVISION HISTORY 1/09Rev. 0 to Rev. A Updated Format .................................................................. Universal Deleted RM-8, N-8, R-16 Packages .................................. Universal Changes to Features and General Description Sections .............. 1 Changes to Table 3 ............................................................................ 5 Changes to Tolerance Section ......................................................... 6 Changes to Ordering Guide ............................................................ 8 7/99Revision 0: Initial Version Rev. A Page 2 of 8