DS1315:Phantom Time Chip

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.

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
DS1315: Block Diagram
DS1315: Block Diagram
titleDownload file
DS1315 Data SheetDS1315.pdf
Part NumberCE Cntrl.Smart Socket w/Int. Batt.Li Batt. MonitorPwr. Fail OutRAMs ControlledVSUPPLY
Package/PinsOper. Temp.
See Notes
-40 to +85
0 to +70
$8.36 @1k

Part NumberInterfaceVSUPPLY
Time Keeping Current
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
typSee Notes
DS1315Phantom Clock3.3
4006None0NV SRAM Control
$8.36 @1k
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1315-33No Longer AvailableDS1315-33+PDIP(N),;16 pin;158.4 mm²0°C to +70°CNo
DS1315-33+ActivePDIP(N),;16 pin;158.4 mm²0°C to +70°CLead Free
DS1315-5No Longer AvailableDS1315-5+PDIP(N),;16 pin;158.4 mm²0°C to +70°CNo
DS1315-5+ActivePDIP(N),;16 pin;158.4 mm²0°C to +70°CLead Free
DS1315E-33+ActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1315E-5+ActiveTSSOP,;20 pin;45.2 mm²0°C to +70°CLead Free
DS1315EN-33No Longer AvailableDS1315EN-33+TSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
DS1315EN-33+ActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
DS1315EN-33+T&RActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
DS1315EN-33/T&RNo Longer AvailableDS1315EN-33+T&RTSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1315EN-5No Longer AvailableDS1315EN-5+TSSOP,;20 pin;45.2 mm²-40°C to +85°CNo
DS1315EN-5+ActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
DS1315EN-5+T&RActiveTSSOP,;20 pin;45.2 mm²-40°C to +85°CLead Free
DS1315N-33No Longer AvailableDS1315N-33+PDIP(N),;16 pin;158.4 mm²-40°C to +85°CNo
DS1315N-33+ActivePDIP(N),;16 pin;158.4 mm²-40°C to +85°CLead Free
DS1315N-5No Longer AvailableDS1315N-5+PDIP(N),;16 pin;158.4 mm²-40°C to +85°CNo
DS1315N-5+ActivePDIP(N),;16 pin;158.4 mm²-40°C to +85°CLead Free
DS1315S-33No Longer AvailableDS1315S-33+SOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
DS1315S-33+ActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
DS1315S-33+T&RActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1315S-5No Longer AvailableDS1315S-5+SOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
DS1315S-5+ActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
DS1315S-5+T&RActiveSOIC(W),;16 pin;111.8 mm²0°C to +70°CLead Free
DS1315S-5/T&RNo Longer AvailableDS1315S-5+T&RSOIC(W),;16 pin;111.8 mm²0°C to +70°CNo
DS1315SN-33No Longer AvailableDS1315SN-33+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
DS1315SN-33+ActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
DS1315SN-5No Longer AvailableDS1315SN-5+SOIC(W),;16 pin;111.8 mm²-40°C to +85°CNo
DS1315SN-5+ActiveSOIC(W),;16 pin;111.8 mm²-40°C to +85°CLead Free
DS1315.pdf DS1315
DS1315.pdf DS1315
DS1315.pdf DS1315
Tips for Writing Bulletproof Real-Time Clock Control Code DS3234
State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks DS3234
Oscillator Design Considerations for Low-Current Applications DS17885
Selecting a Backup Source for Real-Time Clocks DS3234
Using the DS32kHz with Maxim Real-Time Clocks DS17885
Using the SmartWatch/Phantom Clocks with a Microcontroller DS1315
Lithium Coin-Cell Batteries: Predicting an Application Lifetime DS9034PCX
Design Considerations for Maxim Real-Time Clocks DS3234
Crystal Considerations with Maxim Real-Time Clocks (RTCs) DS3234
Using the Dallas Phantom Real-Time Clocks (RTCs) DS1315
DS1315.pdf DS1315
DS1315.pdf DS1315