DS12R885_07 Datasheet, PDF (23/23 Pages) Maxim Integrated Products – RTC with Constant-Voltage Trickle Charger

RTC with Constant-Voltage Trickle Charger
Rev 0; 4/04:
Rev 1; 4/04:
Rev 2; 12/04:
Rev 3; 4/06:
Rev 4; 5/06:
Rev 5; 2/07:
Revision History
Initial release of DS12R885.
Added DS12R887 and DS12CR887 to data sheet.
Official release of DS12R887.
Corrected Intel Bus Write Timing diagram (page 5), Intel Bus Read Timing, IRQ Release Delay
Timing, and Power-Up/Down Timing diagrams (page 6), and Functional Diagram (page 7). Added
EDIP paragraph to Handling, PC Board Layout, and Assembly section (page 21).
Changed pin 16 from N.C. to GND for the SO package (pages 10 and 21).
Updated 114 Bytes bullet in Features (page 1); updated Ordering Information (page 1); corrected
Intel Bus Read Timing diagram (page 6); added note about how the missing V_BACKUP pin on the
DS12CR887 and DS12R887 is internally connected to a lithium cell (page 11); added Package
Information table (page 22).
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.