ISL1218: Low Power RTC with Battery Backed SRAM

The ISL1218 device is a low power real time clock with timing and crystal compensation, clock/calendar, power fail indicator, periodic or polled alarm, intelligent battery backup switching and battery-backed user SRAM.

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.

Key Features
  • Real Time Clock/Calendar
    • Tracks Time in Hours, Minutes, and Seconds
    • Day of the Week, Day, Month, and Year
  • 15 Selectable Frequency Outputs
  • Single Alarm
    • Settable to the Second, Minute, Hour, Day of the Week, Day, or Month
    • Single Event or Pulse Interrupt Mode
  • Automatic Backup to Battery or Super Cap
  • Power Failure Detection
  • On-Chip Oscillator Compensation
  • 8 Bytes Battery-Backed User SRAM
  • I2C Interface
    • 400kHz Data Transfer Rate
  • 400nA Battery Supply Current
  • Same Pin Out as ST M41Txx and Maxim DS13xx Devices
  • Small Package Options
    • 8 Ld MSOP and SOIC Packages
  • Pb-Free Plus Anneal Available (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
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL1218 DatasheetPDF17 Nov 2014348 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
ISL1208, ISL1209, ISL1218, ISL1219, ISL1220, ISL1221 User GuidePDF13 Nov 2014117 KB
Miscellaneous
TitleTypeUpdatedSizeOther Languages
RTC WIN8 Preinstallation ProcedurePDF19 Nov 2014849 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL1218IBZ8 Ld SOIC0.07281260RoHS
ISL1218IBZ-T8 Ld SOIC T+R0.07281260RoHS
ISL1218IUZ8 Ld MSOP0.02582260RoHS
ISL1218IUZ-T8 Ld MSOP T+R0.02582260RoHS
ISL1218 Datasheet 17 Nov 2014
8 Ld SOIC T+R ISL84514
8 Ld MSOP T+R ISL84541
ISL1218
AN1549: Addressing Power Issues in Real Time Clock Applications 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
ISL1208, ISL1209, ISL1218, ISL1219, ISL1220, ISL1221 User Guide 13 Nov 2014
RTC WIN8 Preinstallation Procedure 19 Nov 2014