ADM8690/ADM8691/ADM8692/ADM8693/ADM8695

Rev. B | Page 2 of 20

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 RESET Output......................................................... 10

Watchdog Timer RESET............................................................ 11

Watchdog Output (WDO) ........................................................ 12

CE Gating and RAM Write Protection

(ADM8691/ADM8693/ADM8695)......................................... 12

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 and ADM8692......................................................... 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

REVISION HISTORY

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