ADM8690 Analog Devices, ADM8690 Datasheet - Page 2

• Manufacturer Part Number: ADM8690
• Description: µP Supervisory Circuit, 8-Pin DIP
• Manufacturer: Analog Devices

Specifications of ADM8690

• Batt-backup-flg: Yes
• Product Description: uP Supv Ckt, Watchdog Timer, Backup Battery Switching, 4.65V Reset Trip Voltage, 8-Pin DIP & SOIC
• Reset Threshold (v): 4.65
• Min Reset Timeout (ms): 35
• Reset Output-stage: Active-Low/Push-Pull
• Backup-battery Switch: Yes
• Chip Enable Gating: ---
• Typ Watchdog Timeout (ms): 100,1600
• Package: DIP,SOIC
• Us Price 1000-4999: n/a

ADM8690/ADM8691/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
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 9
Circuit Information ........................................................................ 11
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
ESD Caution .................................................................................. 6
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
Rev. C | Page 2 of 24
Applications Information .............................................................. 15
Typical Applications ....................................................................... 17
Outline Dimensions ....................................................................... 19
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
Power-Fail Warning Comparator ............................................. 14
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
ADM8690 Applications ............................................................. 17
ADM8691/ADM8695 Applications ......................................... 17
RESET Output ............................................................................ 18
Power-Fail Detector ................................................................... 18
RAM Write Protection............................................................... 18
Watchdog Timer ......................................................................... 18
Ordering Guide .......................................................................... 22
Data Sheet