Datasheet
ADM8690/ADM8691/ADM8695 Data Sheet
Rev. C | Page 2 of 24
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 ............................................. 9
Circuit Information ........................................................................ 11
Battery Switchover Section ........................................................ 11
Power-Fail
RESET
Output ......................................................... 11
Watchdog Timer
RESET
............................................................ 12
Watchdog Output (
WDO
) (ADM8691/ADM8695) ................. 13
CE
Gating and RAM Write Protection
(ADM8691/ADM8695) ............................................................. 13
Power-Fail Warning Comparator ............................................. 14
Applications Information .............................................................. 15
Increasing the Drive Current .................................................... 15
Using a Rechargeable Battery for Backup ............................... 15
Adding Hysteresis to the Power-Fail Comparator ................. 15
Monitoring the Status of the Battery ....................................... 15
Alternate Watchdog Input Drive Circuits ............................... 16
Typical Applications ....................................................................... 17
ADM8690 Applications ............................................................. 17
ADM8691/ADM8695 Applications ......................................... 17
RESET
Output ............................................................................ 18
Power-Fail Detector ................................................................... 18
RAM Write Protection............................................................... 18
Watchdog Timer ......................................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 22
REVISION HISTORY
12/11—Rev. B to Rev. C
Deleted ADM8692 and ADM8693 ............................. Throughout
Changes to Table 4 ............................................................................ 7
Change to Power-Fail
RESET
Output Section ............................ 11
Changes to ADM8691/ADM8695 Applications Section .......... 17
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 22
6/11—Rev. A to Rev. B
Deleted ADM8694 ......................................................... Throughout
Updated Figure 11, Figure 12, and Figure 13 ................................ 9
Updated Outline Dimensions ....................................................... 18
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