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Real Time Clock (RTC) IC Clock/Calendar 8KB Parallel 24-DIP Module (0.600", 15.24mm)

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DS17887-3+ General Description

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. The DS17x85 also incorporates a number of enhanced functions including a silicon serial number, power-on/off control circuitry, and 2K, 4K, or 8Kbytes of battery-backed NV SRAM. The DS17287, DS17487, and DS17887 (hereafter referred to as the DS17x87) integrate a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. The DS17x85 and DS17x87 power-control circuitry allows the system to be poweredon by an external stimulus such as a keyboard or by a time-and-date (wake-up) alarm. The active-low PWR output pin is triggered by one or either of these events, and is used to turn on an external power supply. The active-low PWR pin is under software control, so that when a task is complete, the system power can then be shut down.

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Key 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 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


  • Embedded Systems
  • Network Hubs, Bridges, and Routers
  • Security Systems
  • Utility Meters


model DS17887-3+ package N/A
packingQty Tube,14 packingOption Tube
packageType X rohs roHN
lifeCycle production tempRange 0 to 70C
DS17285, DS17287, DS17485, DS17487, DS17885, DS17887: Functional Diagram

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Availability: 7227 PCS

Qty. Unit Price(USD) Ext. Price
1+ $18.970 $18.97
200+ $7.341 $1,468.20
500+ $7.083 $3,541.50
1000+ $6.957 $6,957.00

The prices below are for reference only.