Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322 FEATURES FUNCTIONAL BLOCK DIAGRAMS 27 reset threshold options ADM8316 2.5 V to 5 V in 100 mV increments V CC 4 reset timeout options V CC RESET 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) RESET GENERATOR V REF 4 watchdog timeout options 6.3 ms, 102 ms, 1.6 sec, and 25.6 sec (typical) MR DEBOUNCE Manual reset input WATCHDOG Multiple reset output options DETECTOR Low power consumption Specified over wide temperature range (40C to +125C) GND WDI Qualified for automotive applications Figure 1. ADM8316 5-lead SOT-23 package APPLICATIONS ADM8320 Automotive infotainment RESET Microprocessor systems V CC RESET GENERATOR Computers V REF Controllers Intelligent instruments DEBOUNCE MR Portable equipment WATCHDOG DETECTOR GND WDI Figure 2. ADM8320 GENERAL DESCRIPTION The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ Each device is available in a choice of 27 reset threshold options ADM8322 are supervisory circuits that monitor power supply ranging from 2.5 V to 5 V in 100 mV increments. There are also voltage levels and code execution integrity in microprocessor-based four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms systems. As well as providing power-on reset signals, an on-chip (minimum) and four watchdog timeout options of 6.3 ms, 102 ms, watchdog timer can reset the microprocessor if it fails to strobe 1.6 sec, and 25.6 sec (typical). Not all device options are available within a preset timeout period. A reset signal can also be asserted as standard models. See the Ordering Guide for details. by an external push-button switch through a manual reset input. The ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ The six devices feature different combinations of watchdog ADM8322 are available in 5-lead SOT-23 packages and typically input, manual reset input, and output stage configuration, consume only 10 A, making them suitable for use in low as shown in Table 6. power, portable applications. Rev. C 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 20132018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 11779-001 11779-002ADM8316/ADM8318/ADM8319/ADM8320/ADM8321/ADM8322 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Open-Drain RESET Output ..................................................... 10 Applications ....................................................................................... 1 Manual Reset Input .................................................................... 10 Functional Block Diagrams ............................................................. 1 Watchdog Input .......................................................................... 10 General Description ......................................................................... 1 Applications Information .............................................................. 11 Revision History ............................................................................... 2 Watchdog Input Current ........................................................... 11 Specifications ..................................................................................... 3 Negative Going V Transients ................................................. 11 CC Absolute Maximum Ratings ............................................................ 5 Ensuring Reset Valid to V = 0 V ........................................... 11 CC ESD Caution .................................................................................. 5 Watchdog Software Considerations ......................................... 11 Pin Configurations and Function Descriptions ........................... 6 Device Model Options ................................................................... 12 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 14 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 15 Circuit Description..................................................................... 10 Automotive Products ................................................................. 15 Push-Pull Reset Output ............................................................. 10 REVISION HISTORY 2/2018Rev. B to Rev. C Changes to General Description Section ...................................... 1 Added Note 3, Table 1 ...................................................................... 4 Changed Options Section to Device Model Options Section .. 12 Changes to Device Model Options Section ................................ 12 Deleted Table 10 Renumbered Sequentially .............................. 13 Changes to Ordering Guide .......................................................... 15 9/2016Rev. A to Rev. B Change to Features Section ............................................................. 1 Changes to Table 9 .......................................................................... 12 Changes to Table 10 ........................................................................ 13 Changes to Ordering Guide .......................................................... 14 9/2015Rev. 0 to Rev. A Changes to Table 10 ........................................................................ 13 10/2013Revision 0: Initial Version Rev. C Page 2 of 15