| Direct replacement for IBM AT computer clock/calendarFunctionally compatible with the DS1285/DS1287Available 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 nonvolatileCounts seconds, minutes, hours, days, day of the week, date, month, and year with leap year compensation valid up to 2100Binary or BCD representation of time, calendar, and alarm 12- or 24-hour clock with AM and PM in 12-hour modeDaylight savings time optionMultiplex bus for pin efficiencyInterfaced with software as 128 RAM locations14 bytes of clock and control registers 114 bytes of general purpose RAM Programmable square wave output signalBus-compatible interrupt signals (IRQ-bar)Three interrupts are separately software maskable and testableTime-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 |