DS3232

Extremely Accurate I²C RTC with Integrated Crystal and SRAM


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Description

The DS3232 is a low-cost temperature-compensated crystal oscillator (TCXO) with a very accurate, temperature-compensated, integrated real-time clock (RTC) and 236 bytes of battery-backed SRAM. Additionally, the DS3232 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 DS3232 is available in commercial and industrial temperature ranges, and is offered in an industry-standard 20-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.
DS3232: Typical Operating Circuit DS3232: Typical Operating Circuit Enlarge+

Key Features

  • Accuracy ±2ppm from 0°C to +40°C
  • Accuracy ±3.5ppm from -40°C to +85°C
  • Battery Backup Input for Continuous Timekeeping
  • Operating Temperature Ranges
    • Commercial: 0°C to +70°C
    • Industrial: -40°C to +85°C
  • 236 Bytes of Battery-Backed SRAM
  • Low-Power Consumption
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2099
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • Fast (400kHz) I²C Interface
  • 3.3V Operation
  • Digital Temp Sensor Output: ±3°C Accuracy
  • Register for Aging Trim
  • Active-Low RST Input/Output
  • 300-Mil, 20-Pin SO Package

Applications/Uses

  • GPS
  • Servers
  • Telematics
  • Utility Power Meters
Part NumberFreq.Osc. TypeTuning Adjustment TypeFreq. Output TypeFrequency Stability
(±ppm/yr)
Frequency Stability
(±ppm/yr)
Frequency Stability
(±ppm/yr)
Frequency Stability
(±ppm)
VSUPPLY
(V)
Package/PinsBudgetary
Price
0 to +40°C-40 to 0°C/ +40 to +85°Cvs. VCCvs. AgingSee Notes
DS3232 32.768kHzTCXODigitalCMOS Push-Pull23.51 (typ)5 (0-10 Years)2.3 to 5.5
SOIC/20
$3.96 @1k
See All Oscillator Modules (19)

Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
Memory TypeMemory Size
(Bytes)
Time of Day AlarmsIntegrated ResonatorFunctionsPackage/PinsBudgetary
Price
typSee Notes
DS3232  I2C2.3 to 5.51500NV SRAM2362XTALRTC
SOIC/20
$3.96 @1k
See All Timekeeping & Real-Time Clocks (75)
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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