ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Product Highlights ........................................................................... 1
Functional Block Diagrams............................................................. 1
Revision History ............................................................................... 2
General Description......................................................................... 3
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 8
Circuit Information........................................................................ 10
Battery Switchover Section........................................................ 10
Power-Fail Warning Comparator............................................. 13
Application Information................................................................ 14
Increasing the Drive Current.................................................... 14
Using a Rechargeable Battery for Backup ............................... 14
Adding Hysteresis to the Power-Fail Comparator................. 14
Monitoring the Status of the Battery ....................................... 14
Alternate Watchdog Input Drive Circuits............................... 15
Typical Applications....................................................................... 16
ADM8690, ADM8692, and ADM8694 ................................... 16
ADM8691, ADM8693, and ADM8695 ................................... 16
RESET
Output ............................................................................ 16
Power-Fail Detector ................................................................... 17
RAM Write Protection............................................................... 17
Watchdog Timer......................................................................... 17
Outline Dimensions....................................................................... 18
Ordering Guide .......................................................................... 19
RESET
Power-Fail
Output......................................................... 10
RESET
Watchdog Timer
Watchdog Output (
............................................................ 11
WDO
) ........................................................ 12
CE
Gating and RAM Write Protection
(ADM8691/ADM8693/ADM8695)......................................... 12
REVISION HISTORY
9/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Absolute Maximum Ratings....................................... 6
Updated Ordering Guide............................................................... 20
2/97—Revision 0: Initial Version
Rev. A | Page 2 of 20