Phantom Time Chip

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The DS1315 Phantom Time Chip is a combination of a CMOS timekeeper and a nonvolatile memory controller. In the absence of power, an external battery maintains the timekeeping operation and provides power for a CMOS static RAM. The watch keeps track of hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The last day of the month is automatically adjusted for months with less than 31 days, including leap year correction. The watch operates in one of two formats: a 12-hour mode with an AM/PM indicator or a 24-hour mode. The nonvolatile controller supplies all the necessary support circuitry to convert a CMOS RAM to a nonvolatile memory. The DS1315 can be interfaced with either RAM or ROM without leaving gaps in memory.
DS1315: Block Diagram DS1315: Block Diagram Enlarge+

Key Features

  • Real-Time Clock Keeps Track of Hundredths of Seconds, Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years
  • Automatic Leap Year Correction Valid Up to 2100
  • No Address Space Required to Communicate with RTC
  • Provides Nonvolatile Controller Functions for Battery Backup of SRAM
  • Supports Redundant Battery Attachment for High-Reliability Applications
  • Full ±10% VCC Operating Range
  • +3.3V or +5V Operation
  • Industrial (–40°C to +85°C) Operating Temperature Ranges Available
Part NumberCE Cntrl.Smart Socket w/Int. Batt.Li Batt. MonitorPwr. Fail OutRAMs ControlledVSUPPLY
Package/PinsOper. Temp.
See Notes
DS1315 YesNoNoNo1
-40 to +85
0 to +70
$8.36 @1k
See All Non-Volatile RAM Controllers (8)

Part NumberInterfaceVSUPPLY
Time Keeping Current
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
typSee Notes
DS1315 Phantom Clock
NV SRAM Control
$8.36 @1k
See All Timekeeping & Real-Time Clocks (75)
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.

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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