DS12885/DS12885Q/DS12885T

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DESCRIPTION

The DS12885 real-time clock plus RAM is designed to be a direct replacement for the DS1285. The

DS12885 is identical in form, fit, and function to the DS1285, and has an additional 64 bytes of general

purpose RAM. Access to this additional RAM space is determined by the logic level presented on AD6

during the address portion of an access cycle. An external crystal and battery are the only components

required to maintain time-of-day and memory status in the absence of power. For a complete description

of operating conditions, electrical characteristics, bus timing, and pin descriptions other than X1, X2,

TYPICAL OPERATING CIRCUIT

ORDERING INFORMATION

PART

PIN-PACKAGE

TEMP RANGE

DS12885

24 DIP

0°C to +70°C

DS12885N

24 DIP

-40°C to +85°C

DS12885S

24 SO

0°C to +70°C

DS12885N

24 SO

-40°C to +85°C

DS12885Q

28 PLCC

0°C to +70°C

DS12885QN

28 PLCC

-40°C to +85°C

DS12885Q/T&R

28 PLCC/Tape and Reel

0°C to +70°C

DS12885T

32 TQFP

0°C to +70°C

DS12885TN

32 TQFP

-40°C to +85°C

DS12885T/T&R

32 TQFP/Tape and Reel

0°C to +70°C