Maxim > Products > Real-Time Clocks (RTCs) > DS1339, DS1339C, DS1339U

DS1339, DS1339C, DS1339U

I²C Serial Real-Time Clock

RTC Provides System Flexibility with Multiple Programmable Features

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS1339	Active: In Production.
DS1339C	Active: In Production. See Ordering Information for details.
DS1339U	Active: In Production.

Description

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.

Data Sheet

Download	Rev 8	(PDF, 260kB)
E-Mail

Key Features

Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
Available in a Surface-Mount Package with an Integrated Crystal (DS1339C)
I²C Serial Interface
Two Time-of-Day Alarms
Programmable Square-Wave Output
Oscillator Stop Flag
Automatic Power-Fail Detect and Switch Circuitry
Trickle-Charge Capability
Underwriters Laboratories (UL) Recognized

Applications/Uses

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)

Key Specifications:

Timekeeping & Real-Time Clocks

Part Number

Date/ Time Format

Interface

V_SUPPLY
(V)

Time Keeping Current
(nA)

C_L
(pF)

Memory Type

Time of Day Alarms

Integrated XTAL

Budgetary Price

hh = sec/100

typ

See Notes

DS1339

YY-MM-DD/ HH:MM:SS

I²C

3.3

400

None

$1.18 @1k

See All Timekeeping & Real-Time Clocks (86)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 58		Crystal Considerations with Maxim Real-Time Clocks (RTCs)
Application Note 82		Using the Dallas Tricklecharge Timekeeper
Application Note 95		Interfacing the DS1307 with an 8051-Compatible Microcontroller
Application Note 504		Design Considerations for Maxim Real-Time Clocks
Application Note 505		Lithium Coin-Cell Batteries: Predicting an Application Lifetime
Application Note 701		Using the DS32kHz with Dallas Real-Time Clocks
Application Note 3572		FAQ About the Integrated-Crystal Package Option
Application Note 3816		Selecting a Backup Source for Real-Time Clocks
Application Note 3921		Using a DS1307 with a PIC Microcontroller
Application Note 4247		Oscillator Design Considerations for Low-Current Applications

Product Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report:	DS1339.pdf DS1339C.pdf DS1339U.pdf
Underwriters Laboratories (UL) Recognized

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1339C-2			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339C-2#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1339C-3		N/A	No Longer Available	DS1339C3#	SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339C-3#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1339C-33			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339C-33#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1339C-33#T&R			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1339U-2			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339U-2+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1339U-2+T&R			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1339U-3			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339U-3+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1339U-3+T&R			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1339U-33			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1339U-33+			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1339U-33+T&R			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1339U-33/T&R			Active		µMAX;8 pin;16.2 mm² Outline Drawing:21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5770 Rev 8; 2011-04-19
This page last modified: 2011-04-19