DS12CR887

RTCs with Constant-Voltage Trickle Charger


Please check latest availability status for a specific part variant.

Description

The DS12R885 is a functional drop-in replacement for the DS12885 real-time clock (RTC). The device provides an RTC/calendar, one time-of-day alarm, three maskable interrupts with a common interrupt output, a programmable square wave, and 114 bytes of battery-backed static RAM. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. It also operates in either 24-hour or 12-hour format with an AM/PM indicator. A precision temperature-compensated circuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to a backup supply. The VBACKUP pin supports a rechargeable battery or a super cap and includes an integrated, always enabled trickle charger. The DS12R885 is accessed through a multiplexed byte-wide interface, which supports both Intel and Motorola modes. The DS12CR887 and DS12R887 integrate the DS12R885 die with a crystal and battery.
DS12CR887, DS12R885, DS12R887: Typical Operating Circuit DS12CR887, DS12R885, DS12R887: Typical Operating Circuit Enlarge+

Key Features

  • Trickle-Charge Capability for a Rechargeable Battery or Super Cap
  • Selectable Intel or Motorola Bus Timing
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation to 2100
  • Interrupt Output with Three Independently Maskable Interrupt Flags
  • Time-of-Day Alarm is Once-per-Second to Once-per-Day
  • Periodic Rates from 122µs to 500ms
  • End-of-Clock Update Cycle Flag
  • 14 Bytes of Clock and Control Registers
  • 114 Bytes of General-Purpose Battery-Backed NV RAM with Clear Input
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • +5.0V or +3.3V Operation
  • Industrial Temperature Range
  • DS12CR887 Encapsulated DIP (EDIP) Module with Integrated Battery and Crystal
  • DS12R887 BGA Module Surface-Mountable Package with Integrated Crystal and Rechargeable Battery

Applications/Uses

  • Embedded Systems
  • Network Hubs, Switches, Routers
  • Security Systems
  • Utility Meters
Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory TypeMemory Size
(Bytes)
Time of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS12CR887 Multiplexed
3.3
5
--NV SRAM1141RTC
MOD/24
$6.23 @1k
DS12R885 80012.5
SOIC (W)/24
$1.80 @1k
See All Timekeeping & Real-Time Clocks (77)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

CAD Symbols and Footprints

  • DS12CR887-33+
  • DS12CR887-5+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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