DS14285

实时时钟，带有非易失RAM控制器

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产品详情

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 (active-low 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

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