DS1339 Datasheet

Part No.	In Stock	Price	Packaging	SPQ	Marking	MSL	Pins	Temp Range	Package Description
DS1339U-2+	0	$3.195	Tube	50	1339 rr-2	1	8	-40°C ~ 85°C	8-uMAX/uSOP
DS1339U-2+T&R	0	$2.844	Reel	3000	1339 rr-2	1	8	-40°C ~ 85°C	8-uMAX/uSOP
DS1339U-3+	0	$2.772	Tube	50	1339 rr-3	1	8	-40°C ~ 85°C	8-uMAX/uSOP
DS1339U-3+T&R	500pcs	$2.772	Reel	3000	1339 rr-3	1	8	-40°C ~ 85°C	8-uMAX/uSOP
DS1339U-33+	0	$3.276	Tube	50	1339 rr-33	1	8	-40°C ~ 85°C	8-uMAX/uSOP
DS1339U-33+T&R	3000pcs	$2.808	Reel	3000	1339 rr-33	1	8	-40°C ~ 85°C	8-uMAX/uSOP

• Completely Manages All Timekeeping Functions
  • Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • Oscillator Stop Flag
• Interfaces to Most Microcontrollers
  • I²C Serial Interface
• Low-Power Operation Extends Battery Backup Run Time
  • Automatic Power-Fail Detect and Switch Circuitry
  • Trickle-Charge Capability
• Underwriters Laboratories^® (UL) Recognized
• Surface-Mount Package with an Integrated Crystal (DS1339C Saves Additional Space and Simplifies Design

• 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)

The DS1339 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 DS1339 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.