| Drop-in replacement for IBM AT computer clock/calendar RTC counts seconds, minutes, hours, days, dates, months, years, and leap years, valid to 2100 Binary or BCD format Selectable 12-hour with a.m./p.m. or 24-hour modes Optional daylight savings Century register maintains Y2K compatibility in hardware Nonvolatile timekeeping Embedded lithium, crystal and support circuitry Multiplexed bus timing selectable for Motorola or Intel processors Timekeeping read/written as 128-RAM locations 15-bytes clock/control registers 113-bytes user RAM Generates square wave output signals Three software-maskable processor interrupts Programmable time-of-day alarm, from 1/second to 1/day Interval alarms from 122ms to 500ms Optional RAM-clear pin (DS12C887A) Temperature range: DS12C887/DS12C887A: 0°C to 70°C DS12C887-IND/DS12C887A-IND: -40°C to +85°C |