Low Voltage Supervisory Circuits with Watchdog Timer in 4-Lead SC70 Data Sheet ADM8616/ADM8617 FEATURES FUNCTIONAL BLOCK DIAGRAM Precision 1.8 V to 5 V power supply monitoring ADM8616 RESET 9 threshold options V CC 1.58 V to 4.63 V V RESET CC 4 timeout options RESET RESET GENERATOR V 1 ms, 20 ms, 140 ms, 1120 ms REF 3 watchdog timeout options 6.3 ms, 102 ms, 1.6 sec WATCHDOG RESET output stages DETECTOR Push-pull active-low (ADM8616) Open-drain active-low (ADM8617) GND WDI Low power consumption (5 A) Figure 1. Guaranteed reset output valid to V = 1 V CC Power supply glitch immunity Specified over 40C to +85C temperature range 4-lead SC70 package APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Portable equipment GENERAL DESCRIPTION The ADM8616/ADM8617 are supervisory circuits that monitor The parts differ in terms of reset output configuration. The power supply voltage levels and code execution integrity in micro- ADM8616 is active-low with a push-pull output, while the processor-based systems. A power-on reset signal generates when ADM8617 is active-low with an open-drain output. the supply voltage rises to a preset threshold level. The ADM8616/ The ADM8616/ADM8617 are available in 4-lead SC70 packages ADM8617 have an on-chip watchdog timer that can reset the and typically consume only 5 A, making them suitable for use microprocessor if it fails to strobe within a preset timeout in low power, portable applications. period. Each part is available in the following nine reset threshold options: 1.58 V, 1.67 V, 2.19 V, 2.32 V, 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V. There are four reset timeout options: 1 ms, 20 ms, 140 ms, and 1120 ms. There are also three possible watchdog timeouts available: 6.3 ms, 102 ms, and 1.6 sec. Not all device options are released for sale as standard models. See the Ordering Guide for details. 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Technical Support www.analog.com 04795-001ADM8616/ADM8617 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Circuit Description............................................................................8 Applications ....................................................................................... 1 RESET Output ...............................................................................8 Functional Block Diagram .............................................................. 1 Watchdog Input .............................................................................8 General Description ......................................................................... 1 Application Information ...................................................................9 Revision History ............................................................................... 2 Watchdog Input Current ..............................................................9 Specifications ..................................................................................... 3 Negative-Going V Transients ...................................................9 CC Absolute Maximum Ratings ............................................................ 4 Ensuring RESET Valid to V = 0 V ...........................................9 CC ESD Caution .................................................................................. 4 Watchdog Software Considerations ............................................9 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ....................................................................... 10 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 10 REVISION HISTORY 2/2018Rev. B to Rev. C 11/2006Rev. 0 to Rev. A Changes to General Description Section ...................................... 1 Changes to Ordering Guide .......................................................... 10 Added Note 1, Table 1 ...................................................................... 3 Moved Ordering Guide .................................................................. 10 6/2005Revision 0: Initial Version Changes to Figure 16 and Ordering Guide ................................. 10 1/2007Rev. A to Rev. B Changes to Functional Block Diagram .......................................... 1 Rev. C Page 2 of 10