Features and Benefits

  • Completely Manages All Timekeeping Functions
    • RTC Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century
    • Leap-Year Compensation
    • 31 x 8-Bit SRAM for Scratchpad Data Storage
    • Programmable Time/Date Polled ALARM Function
    • Uses Standard 32.768kHz Watch Crystal
  • Low-Power Operation Extends Battery Life
    • Low Timekeeping Current (400nA at 2V)
    • +2V to +5.5V Wide Operating Voltage Range
  • Standard Serial Port Interfaces with Most Microcontrollers
    • SPI (Mode 1 or 3) Interface: 4MHz at 5V, 1MHz at 2V
    • Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM
  • 3mm x 3mm x 0.8mm, 8-Pin TDFN Package Minimizes Required Space
    • No External Crystal Bias Resistors or Capacitors Required

Product Details

The DS1347 SPI-compatible real-time clock (RTC) contains a real-time clock/calendar and 31 x 8 bits of static random-access memory (SRAM). The real-time clock/calendar provides seconds, minutes, hours, day, date, month, year, and century information. A time/date programmable polled ALARM is included in the device. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24hr or 12hr format with an active-low AM/PM indicator. The device operates with a supply voltage of +2V to +5.5V, are available in the ultra-small 8-pin TDFN package, and work over the -40°C to +85°C industrial temperature range.


  • Battery-Powered Products
  • Fax Machines
  • Intelligent Instruments
  • Point-of-Sale Equipment
  • Portable Instruments

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Product Recommendations

DS1347 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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