Low Voltage, Supervisory Circuit with Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet ADM6823 FEATURES FUNCTIONAL BLOCK DIAGRAM Precision low voltage monitoring ADM6823 9 reset threshold options: 1.58 V to 4.63 V (typical) V CC 140 ms (minimum) reset timeout V CC Watchdog timer with 1.6 sec timeout (typical) RESET RESET GENERATOR V REF Manual reset input Reset output stage MR DEBOUNCE Push-pull active-low WATCHDOG Low power consumption: 7 A (typical) DETECTOR Guaranteed reset output valid to V = 1 V CC Power supply glitch immunity GND WDI Specified from 40C to +125C 5-lead SOT-23 package Figure 1. APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Portable equipment GENERAL DESCRIPTION The ADM6823 is a low voltage, supervisory circuit that monitors The part is available in nine reset threshold options, ranging from 1.58 V to 4.63 V (typical). The reset and watchdog timeout power supply voltage levels and code execution integrity in micro- processor-based systems. As well as providing power-on reset periods are fixed at 140 ms (minimum) and 1.6 sec (typical), signals, an on-chip watchdog timer can reset the microprocessor if respectively. Not all device models are released for sale as standard it fails to strobe within a preset timeout period. A reset signal models. See the Ordering Guide for details. can also be asserted by means of an external push-button through The ADM6823 is available in a 5-lead SOT-23 package and a manual reset input. typically consumes only 7 A, making it suitable for use in low power, portable applications. Rev. E Document Feedback 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 20052018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 04535-001ADM6823 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation .........................................................................8 Applications ....................................................................................... 1 Reset Output ..................................................................................8 Functional Block Diagram .............................................................. 1 Manual Reset Input .......................................................................8 General Description ......................................................................... 1 Watchdog Input .............................................................................8 Revision History ............................................................................... 2 Application Information ...................................................................9 Specif icat ions ..................................................................................... 3 Watchdog Input Current ..............................................................9 Absolute Maximum Ratings ............................................................ 4 Negative-Going V Transients ...................................................9 CC ESD Caution .................................................................................. 4 Ensuring Reset Valid to V = 0 V ..............................................9 CC Pin Configuration and Function Descriptions ............................. 5 Watchdog Software Considerations ............................................9 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 10 Ordering Guide ............................................................................... 10 REVISION HISTORY 2/2018Rev. D to Rev. E Changes to General Description Section ...................................... 1 2/2013Rev. A to Rev. B Added Note 1, Table 1 ...................................................................... 3 Updated Outline Dimensions ...................................................... 11 Changes to Figure 17 and Ordering Guide ................................. 10 Changes to Ordering Guide .......................................................... 12 Deleted Automotive Products Section ........................................ 12 7/2015Rev. C to Rev. D Change to Figure 12 ......................................................................... 8 9/2012Rev. 0 to Rev. A Removed ADM6821/ADM6822 (Throughout) ............................ 1 2/2015Rev. B to Rev. C Updated Outline Dimensions ....................................................... 11 Deleted ADM6824/ADM6825 (Throughout) .............................. 1 Changes to Ordering Guide .......................................................... 11 Deleted Table 1 Renumbered Sequentially .................................. 1 Added Automotive Products Section .......................................... 11 Deleted Figure 3 and Figure 4 Renumbered Sequentially .......... 6 Changes to Figure 4, Figure 5, Figure 7, and Figure 8 ................. 7 6/2005Revision 0: Initial Version Changes to Ordering Guide .......................................................... 12 Rev. E Page 2 of 10