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DS1339, DS1339C, DS1339U
I²C Serial Real-Time Clock
RTC Provides System Flexibility with Multiple Programmable Features
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Status
| Part Number |
Status |
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DS1339
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Active: In Production. |
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DS1339C
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Active: In Production. See Ordering Information for details. |
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DS1339U
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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.
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Data Sheet
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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
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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)
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Time Keeping Current
(nA) |
CL
(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 |
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400 |
6 |
None |
2 |
No |
$1.18 @1k |
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See All Timekeeping & Real-Time Clocks (86)
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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.
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Diagram
Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-5770
Rev 8;
2011-04-19
This page last modified: 2011-04-19
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