DS17287-3+

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 (hereafter 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 PowerOn 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 NV SRAM● 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)● Optional Industrial Temperature Range Available● Underwriters Laboratory (UL) Recognized