DS14287

DS14287 Description

DS14287 Description

DS14287 Categories

DS14287 Manufacturer

DS14287 Datasheet (PDF)

DS14287 Price & Availability

DS14287 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 savings 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-bar)
• 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

DS14287 Parameters

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