DS12887A

DS12887A - Real Time Clock

FEATURES

ß Drop–in replacement for IBM AT computer

clock/calendar

ß Pin-compatible with the MC146818B and

DS1287

ß Totally nonvolatile with over 10 years of

operation in the absence of power

ß Self–contained subsystem includes lithium,

quartz, and support circuitry

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

the week, date, month, and year with leap

year compensation valid up to 2100

ß Binary or BCD representation of time,

calendar, and alarm

ß 12– or 24–hour clock with AM and PM in

12–hour mode

ß Daylight Savings Time option

ß Selectable between Motorola and Intel bus

timing

ß Multiplex bus for pin efficiency

ß Interfaced with software as 128 RAM

locations

– 14 bytes of clock and control registers

– 114 bytes of general purpose RAM

ß Programmable square wave output signal

ß Bus–compatible interrupt signals ( IRQ )

ß Three interrupts are separately software–

maskable and testable

– Time–of–day alarm once/second to

once/day

– Periodic rates from 122 ms to 500 ms

– End of clock update cycle

DESCRIPTION

The DS12887 Real Time Clock plus RAM is designed to be a direct replacement for the DS1287. The

DS12887 is identical in form, fit, and function to the DS1287, 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. A lithium energy source, quartz crystal, and write–

protection circuitry are contained within a 24–pin dual in-line package. As such, the DS12887 is a

complete subsystem replacing 16 components in a typical application. The functions include a nonvolatile

time–of–day clock, an alarm, a one-hundred–year calendar, programmable interrupt, square wave

generator, and 114 bytes of nonvolatile static RAM. The real time clock is distinctive in that time–of–day

and memory are maintained even in the absence of power. 

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REFUNDS & RETURN:

We offer a warranty on all items that we sold. Item will be tested before ship,it will be in good condition,if there are some problems with the item,feel free to contact us.Please Email us to notify a defective item. Unless otherwise specified, this item comes with 30 days warranty from the shipment date.

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