Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 FEATURES FUNCTIONAL BLOCK DIAGRAMS 26 reset threshold options ADM6316 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, 1600 ms, and 25.6 sec (typical) MR DEBOUNCE Manual reset input WATCHDOG DETECTOR Reset output stages Push-pull active low Open-drain active low GND WDI Push-pull active high Figure 1. Low power consumption: 5 A Guaranteed reset output valid to VCC = 1 V ADM6320 Power supply glitch immunity Specified over industrial temperature range V CC RESET 5-lead SOT-23 package RESET GENERATOR V REF APPLICATIONS MR DEBOUNCE Microprocessor systems WATCHDOG Computers DETECTOR Controllers Intelligent instruments GND WDI Portable equipment Figure 2. GENERAL DESCRIPTION The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ Each device is available in a choice of 26 reset threshold options ADM6321/ADM6322 are supervisory circuits that monitor ranging from 2.5 V to 5 V in 100 mV increments. There are also power supply voltage levels and code execution integrity in four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms microprocessor-based systems. As well as providing power-on (minimum) and four watchdog timeout options of 6.3 ms, 102 ms, reset signals, an on-chip watchdog timer can reset the micro- 1600 ms, and 25.6 sec (typical). processor if it fails to strobe within a preset timeout period. A The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ reset signal can also be asserted by an external push button ADM6321/ADM6322 are available in 5-lead SOT-23 packages through a manual reset input. The seven devices feature different and typically consume only 3 A, making them suitable for use combinations of watchdog input, manual reset input, and output in low power portable applications. stage configuration, as shown in Table 1. Table 1. Selection Table Output Stage RESET Part No. Watchdog Manual Reset RESET ADM6316 Yes Yes Push-pull No ADM6317 Yes Yes No Push-pull ADM6318 Yes No Push-pull Push-pull ADM6319 No Yes Push-pull Push-pull ADM6320 Yes Yes Open-drain No ADM6321 Yes No Open-drain Push-pull ADM6322 No Yes Open-drain Push-pull Rev. H 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 20042015 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. 04533-028 04533-001ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Open-Drain RESET Output ........................................................9 Applications ....................................................................................... 1 Manual Reset Input .......................................................................9 Functional Block Diagrams ............................................................. 1 Watchdog Input .............................................................................9 General Description ......................................................................... 1 Applications Information .............................................................. 10 Revision History ............................................................................... 2 Watchdog Input Current ........................................................... 10 Specifications ..................................................................................... 3 Negative Going V Transients ................................................. 10 CC Absolute Maximum Ratings ............................................................ 5 Ensuring Reset Valid to V = 0 V ........................................... 10 CC ESD Caution .................................................................................. 5 Watchdog Software Considerations ......................................... 10 Pin Configurations and Function Descriptions ........................... 6 Model Options ................................................................................ 11 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 13 Circuit Description ........................................................................... 9 Ordering Guide .......................................................................... 14 Reset Output ................................................................................. 9 REVISION HISTORY 12/15Rev. G to Rev. H 4/07Rev. B to Rev. C Added Figure 2...................................................................................1 Added Endnote 1 and Endnote 2, Table 2 ..................................... 3 Change to Model Options Section Title ...................................... 11 Changes to Figure 23 ...................................................................... 13 Added Endnote 1, Table 5.............................................................. 11 Changes to Ordering Guide .......................................................... 13 Changes to Table 8 .......................................................................... 12 Changes to Ordering Guide .......................................................... 14 1/07Rev. A to Rev. B Changes to Functional Block Diagram ........................................... 1 1/15Rev. F to Rev. G Changes to Figure 18 ...................................................................... 10 Changes to Table 8 .......................................................................... 12 5/06Rev. 0 to Rev. A 5/13Rev. E to Rev. F Updated Format .................................................................. Universal Changes to Table 8 .......................................................................... 12 Changes to Functional Block Diagram ........................................... 1 Changes to Ordering Guide .......................................................... 13 Changes to Table 8 .......................................................................... 12 Changes to Figure 22 ...................................................................... 13 10/10Rev. D to Rev. E Changes to Ordering Guide .......................................................... 13 Changes to Table 8 .......................................................................... 12 Updated Outline Dimensions ....................................................... 13 10/04Revision 0: Initial Version 8/08Rev. C to Rev. D Change to Figure 18 ......................................................................... 9 Rev. H Page 2 of 14