ISL12026: Real Time Clock/Calendar with I2C Bus™ and EEPROM

The ISL12026 and the ISL12026A devices are micro power real time clocks with timing and crystal compensation, clock/calender, power-fail indicator, two periodic or polled alarms, intelligent battery backup switching, and integrated 512x8-bit EEPROM configured in 16 Bytes per page.

The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.

The ISL12026 and ISL12026A have different types of Power Control Settings. The ISL12026 uses the Legacy Mode Setting, which follows conditions set in X1226 products. The ISL12026A uses the Standard Mode Setting. Please refer to "Power Control Operation" on page 13 for more details. Also, please refer to "I2C Communications During Battery Backup" on page 22 for important details.

Key Features
  • Real Time Clock/Calendar
    • Tracks Time in Hours, Minutes and Seconds
    • Day of the Week, Day, Month and Year
    • 3 Selectable Frequency Outputs
  • Two Non-Volatile Alarms
    • Settable on the Second, Minute, Hour, Day of the Week, Day or Month
    • Repeat Mode (Periodic Interrupts)
  • Automatic Backup to Battery or SuperCap
  • On-Chip Oscillator Compensation
    • Internal Feedback Resistor and Compensation Capacitors
    • 64 Position Digitally Controlled Trim Capacitor
    • 6 Digital Frequency Adjustment Settings to ±30ppm
  • 512x8 Bits of EEPROM
    • 16-Byte Page Write Mode (32 total pages)
    • 8 Modes of BlockLock™ Protection
    • Single Byte Write Capability
  • High Reliability
    • Data Retention: 50 years
    • Endurance: >2,000,000 Cycles Per Byte
  • I2C Interface
    • 400kHz Data Transfer Rate
  • 800nA Battery Supply Current
  • Package Options
    • 8 Ld SOIC and 8 Ld TSSOP Packages
  • Pb-Free (RoHS Compliant)
Applications
  • Utility Meters
  • HVAC Equipment
  • Audio/Video Components
  • Set-Top Box/Television
  • Modems
  • Network Routers, Hubs, Switches, Bridges
  • Cellular Infrastructure Equipment
  • Fixed Broadband Wireless Equipment
  • Pagers/PDA
  • POS Equipment
  • Test Meters/Fixtures
  • Office Automation (Copiers, Fax)
  • Home Appliances
  • Computer Products
  • Other Industrial/Medical/Automotive
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1549: Addressing Power Issues in Real Time Clock ApplicationsPDF13 Nov 201469 KB
AN1535: Prevent Reverse Charging of a Lithium Battery to Meet UL Safety RequirementPDF13 Nov 2014156 KB
AN1325: Choosing and Using Bypass CapacitorsPDF13 Nov 2014579 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL12026, ISL12026A DatasheetPDF17 Nov 2014556 KB
Software
TitleTypeUpdatedSizeOther Languages
Real Time Clock (RTC) Evaluation Installer for Windows 2000EXE31 Oct 20141.62 MB
Real Time Clock (RTC) Evaluation Installer for Windows 8EXE31 Oct 20147.85 MB
Real Time Clock (RTC) Evaluation Installer for Windows XP / Windows 7EXE31 Oct 20143.02 MB
Tech Briefs
TitleTypeUpdatedSizeOther Languages
TB460: Replacing the x1226, x1227 or x1228 RTC with the ISL12026, ISL12026A, ISL12027 or ISL12028PDF19 Nov 201440 KB
User Guides
TitleTypeUpdatedSizeOther Languages
Real Time Clock USB Evaluation Board User GuidePDF12 May 2015487 KB
Miscellaneous
TitleTypeUpdatedSizeOther Languages
RTC WIN8 Preinstallation ProcedurePDF19 Nov 2014849 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL12026IBZ8 Ld SOIC0.07281260RoHS
ISL12026IBZ-T8 Ld SOIC T+R0.07281260RoHS
ISL12026IBZ-T7A8 Ld SOIC T+R0.07281260RoHS
ISL12026IVZ8 Ld TSSOP0.03381260RoHS
ISL12026IVZ-T8 Ld TSSOP T+R0.03381260RoHS
ISL12026IBZ-EVALN/A
ISL12026DBEV1ZN/ARoHS
ISL12026, ISL12026A Datasheet 17 Nov 2014
8 Ld SOIC T+R ISL84514
8 Ld TSSOP T+R ISL12024
ISL12026
AN1549: Addressing Power Issues in Real Time Clock Applications 13 Nov 2014
AN1535: Prevent Reverse Charging of a Lithium Battery to Meet UL Safety Requirement 13 Nov 2014
AN1325: Choosing and Using Bypass Capacitors 13 Nov 2014
Real Time Clock (RTC) Evaluation Installer for Windows 2000 31 Oct 2014
Real Time Clock (RTC) Evaluation Installer for Windows 8 31 Oct 2014
Real Time Clock (RTC) Evaluation Installer for Windows XP / Windows 7 31 Oct 2014
TB460: Replacing the x1226, x1227 or x1228 RTC with the ISL12026, ISL12026A, ISL12027 or ISL12028 19 Nov 2014
Real Time Clock USB Evaluation Board User Guide 12 May 2015
RTC WIN8 Preinstallation Procedure 19 Nov 2014