The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designed to be
successors to the industry-standard DS12885 and DS12887. The DS17285, DS17485, and DS17885 (here after referred to as the DS17x85) provide a real-time clock/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed NV SRAM.
Features
♦Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
♦RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
♦Optional +3.0V or +5.0V Operation
♦SMI Recovery Stack
♦64-Bit Silicon Serial Number
♦Power-Control Circuitry Supports System Power On from Date/Time Alarm or Key Closure
♦Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
♦12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
♦114 Bytes of General-Purpose, Battery-Backed NVSRAM
♦Extended Battery-Backed NV SRAM
2048 Bytes (DS17285/DS17287)
4096 Bytes (DS17485/DS17487)
8192 Bytes (DS17885/DS17887)
♦RAM Clear Function
♦Interrupt Output with Six Independently Maskable Interrupt Flags
♦Time-of-Day Alarm Once per Second to Once per Day
♦End of Clock Update Cycle Flag
♦Programmable Square-Wave Output
♦Automatic Power-Fail Detect and Switch Circuitry
♦Available in PDIP, SO, or TSOP Package
(DS17285, DS17485, DS17885)
♦Optional Encapsulated DIP (EDIP) Package with
Integrated Crystal and Battery (DS17287, DS17487, DS17887)
