FEATURES

Direct Replacement for IBM AT

Computer Clock/Calendar

Functionally Compatible with the

DS1285/DS1287

Available as Chip (DS14285, DS14285S, or

DS14285Q) or Stand-Alone Module with

Embedded Lithium Battery and Crystal

(DS14287)

Automatic Backup Supply and Write

Protection to Make External SRAM

Nonvolatile

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- or 24-Hour Clock with AM and PM in

12-Hour Mode

Daylight Saving Time Option

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

Bus-Compatible Interrupt Signals (IRQ)

Three Interrupts are Separately Software-

Maskable and Testable

Time-of-Day Alarm Once/Second to

Once/Day

Periodic Rates from 122μs to 500ms

End of Clock Update Cycle

Optional Industrial Temperature Version

Available: DS14285 DIP, SO, and PLCC