DS1339A:Low-Current, I²C, Serial Real-Time Clock

RTC Provides System Flexibility with Multiple Programmable Features for a Typical 250nA Timekeeping Current

The DS1339A serial real-time clock (RTC) is a low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/date provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month 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 DS1339A has a builtin power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.

Key Features
  • Drop-In Replacement for DS1339
  • Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Up to 2200
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output
  • Supports Crystals with Up to 60kΩ ESR
  • Maintains Time Even During Power Outage with Backup Supply Pin
    • Automatic Power-Fail Detect and Switch Circuitry
    • Trickle-Charge Capability
    • Supports VCC from 1.8V to 5V
    • Oscillator Stop Flag
    • Oscillator Runs Down to 1.15V
  • Interfaces with a Wide Range of Microcontrollers
    • I2C Serial Interface
  • Underwriters Laboratories (UL) Recognized
DS1339A: Functional Diagram
DS1339A: Functional Diagram
Applications/Uses
  • Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
  • Handhelds (GPS, POS Terminals)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printers, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Routers, Switches, Servers)
DataSheet
titleDownload file
DS1339A Data SheetDS1339A.pdf
Parametrics
Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS1339AI2C1.8 to 5.53006None2RTCµMAX/8$1.60 @1k
Quality and Environmental Data
Related Products
  • DS1339:I²C Serial Real-Time Clock
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS1339AU+ActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
DS1339AU+TActiveµMAX,;8 pin;15.6 mm²-40°C to +85°CLead Free
DS1339A.pdf DS1339A
DS1339A_cn.pdf DS1339A
DS1339A.pdf DS1339A
DS1339A.pdf DS1339A
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
Lithium Coin-Cell Batteries: Predicting an Application Lifetime DS9034PCX
Design Considerations for Maxim Real-Time Clocks DS3234
Interfacing the DS1307 with an 8051-Compatible Microcontroller DS1340C
Using the Dallas Tricklecharge Timekeeper DS1672
Crystal Considerations with Maxim Real-Time Clocks (RTCs) DS3234
DS1339A.pdf DS1339A
DS1339A_cn.pdf DS1339A