The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3231 is available in commercial and industrial temperature ranges, and is offered in a 16-pin, 300-mil SO package.
The RTC maintains 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 an active-low AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I²C bidirectional bus.
A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a µP reset.
|Part Number||Freq.||Osc. Type||Tuning Adjustment Type||Freq. Output Type||Frequency Stability|
|0 to +40°C||-40 to 0°C/ +40 to +85°C||vs. VCC||vs. Aging||See Notes|
|DS3231||32.768kHz||TCXO||Digital||CMOS Open-Drain||2||3.5||1 (typ)||5 (0-10 Years)||2.3 to 5.5|
|See All Oscillator Modules (19)|
|Time Keeping Current|
|Memory Type||Time of Day Alarms||Integrated Resonator||Functions||Package/Pins||Budgetary|
|DS3231||I2C||2.3 to 5.5||840||None||2||XTAL||RTC|
|See All Timekeeping & Real-Time Clocks (75)|
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|
|Tutorial||5791||Tips for Writing Bulletproof Real-Time Clock Control Code|
|App Note||5589||Industry Turns to MEMS for Accurate Real-Time Clocks|
|Tutorial||5445||Stuxnet and Other Things that Go Bump in the Night|
|Tutorial||5413||State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks|
|App Note||5329||Implementing Flawless Designs with Accurate I²C Real-Time Clocks|
|App Note||5143||Feature Comparison of the DS323x Real-Time Clocks|
|App Note||3816||Selecting a Backup Source for Real-Time Clocks|
|App Note||3644||Power Considerations for Accurate Real-Time Clocks|
|App Note||3572||FAQ About the Integrated-Crystal Package Option|
|App Note||3506||Interfacing a DS3231 with an 8051-Type Microcontroller|
|App Note||504||Design Considerations for Maxim Real-Time Clocks|
|App Note||58||Crystal Considerations with Maxim Real-Time Clocks (RTCs)|