DS1338U
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DS1338U

I²C RTC with 56-Byte NV RAM

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Part Details
Features
  • Completely Manages All Timekeeping Functions
    • RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
    • 56-Byte, Battery-Backed, General- Purpose RAM with Unlimited Writes
    • Programmable Square-Wave Output Signal
  • Surface-Mount Package with an Integrated Crystal (DS1338C) Saves Additional Space and Simplifies Design
  • Interfaces with Most Microcontrollers
    • I2C Serial Interface
  • Low-Power Operation Extends Battery Backup Run Time
    • Automatic Power-Fail Detect and Switch Circuitry
  • -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications
  • Underwriters Laboratories (UL®) Recognized
Additional Details
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The DS1338 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. 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 24-hour or 12-hour format with AM/PM indicator. The DS1338 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time and date operation.

Applications

  • Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
  • Handhelds (GPS, POS Terminal)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printer, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Router, Switcher, Server)

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