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072902

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: http://www.maxim-ic.com/errata.

FEATURES

§ Drop-in replacement for IBM AT computer

clock/calendar

§ Pin configuration closely matches

MC146818B and DS1285

§ Counts seconds, minutes, hours, days, day of

the week, date, month, and year with leap-

year compensation valid up to 2100

§ Binary or BCD representation of time,

calendar, and alarm

§ 12-hour or 24-hour clock with AM and PM in

12-hour mode

§ Daylight Savings Time option

§ Selectable between Motorola and Intel bus

timing

§ Multiplex bus for pin efficiency

§ Interfaced with software as 128 RAM

locations

§ 14 bytes of clock and control registers

§ 114 bytes of general purpose RAM

§ Programmable square-wave output signal

§ Three interrupts are separately software-

maskable and testable

§ Time-of-day alarm once/second to once/day

§ Periodic rates from 122

µs to 500ms

§ End-of-clock update cycle

§ Optional 28-pin PLCC surface mount package

or 32-pin TQFP

§ Optional industrial temperature range

available

§ Underwriters Laboratory (UL) recognized

PIN ASSIGNMENT (Top View)

Package Dimension Information

http://www.maxim-ic.com/TechSupport/DallasPackInfo.htm

DS12885/DS12885Q/DS12885T

Real-Time Clock

www.maxim-ic.com

www.maxim-ic.com

DS12885Q

28 PLCC

DS12885T

32 TQFP