DS1339A

Low-Current, I²C, Serial Real-Time Clock

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


Please check latest availability status for a specific part variant.

Description

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.
DS1339A: Functional Diagram DS1339A: Functional Diagram Enlarge+

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

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)
Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory TypeTime of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS1339A I2C1.8 to 5.53006None2RTC
UMAX/8
$1.60 @1k
See All Timekeeping & Real-Time Clocks (77)
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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Related Resources


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Low-Current, Real-Time Clock with I2C Interface and Power Management

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  • Provides Flexible Configurability
  • Saves Board Space



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05/29/2020 - 05/31/2020, Detroit, MI
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