The 1338 is a serial real-time clock (RTC) device that consumes ultra-low power and provides a full binary-coded decimal (BCD) clock/calendar with 56 bytes of battery backed Non-Volatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. Access to the clock/calendar registers is provided by an I2C interface capable of operating in fast I2C mode. Built-in Power-sense circuitry detects power failures and automatically switches to the backup supply, maintaining time and date operation.


  • Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
  • 56-Byte battery-backed Non Volatile RAM for data storage
  • Fast mode I2C Serial interface
  • Automatic power-fail detect and switch circuitry
  • Programmable square-wave output
  • Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC (surface-mount package with an integrated crystal)
  • Industrial temperature range (-40°C to +85°C)


タイトル language 分類 形式 サイズ 日付
star 1338 Datasheet データシート PDF 427 KB
Errata# : UEN-13-01 データシートエラッタ PDF 421 KB
1338B-31 Datasheet データシート PDF 541 KB
AN-828 Termination - LVPECL アプリケーションノート PDF 322 KB
AN-844 Termination - AC Coupling Clock Receivers アプリケーションノート PDF 170 KB
AN-845 Termination - LVCMOS アプリケーションノート PDF 146 KB
AN-842 Thermal Considerations in Package Design and Selection アプリケーションノート PDF 495 KB
AN-840 Jitter Specifications for Timing Signals アプリケーションノート PDF 442 KB
AN-838 Peak-to-Peak Jitter Calculations アプリケーションノート PDF 115 KB
AN-839 RMS Phase Jitter アプリケーションノート PDF 233 KB
AN-815 Understanding Jitter Units アプリケーションノート PDF 565 KB
AN-827 Application Relevance of Clock Jitter アプリケーションノート PDF 1.15 MB
AN-805 Recommended Ferrite Beads アプリケーションノート PDF 121 KB
PCN# : A2003-01 Add Greatek Taiwan as an Alternate Assembly Location on Select Packages 製品変更通知 PDF 113 KB
PDN#: CQ-19-04 Product Discontinuance Notice 製品中止通知 PDF 1010 KB
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly 製品変更通知 PDF 611 KB
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly 製品変更通知 PDF 611 KB
PDN# : CQ-14-08 Manufacturing Discontinunce PDN 製品中止通知 PDF 486 KB
PCN# : A1403-03 Gold wire to Copper wire 製品変更通知 PDF 42 KB
PCN# : W1101-02R4 Fab 4 to TSMC 製品変更通知 PDF 70 KB
PCN# : W1101-02R3 Fab 4 to TSMC 製品変更通知 PDF 71 KB
PCN# : W1101-02R2 Fab 4 to TSMC 製品変更通知 PDF 67 KB
PCN# : A1208-01R1 Gold to Copper Wire 製品変更通知 PDF 254 KB
PCN# : A1208-06 Changed of Assembly Location and Crystal 製品変更通知 PDF 1.06 MB
PCN# : A1204-01R1 Revised Notification to Remove Selective Devices from TSSOP-16 製品変更通知 PDF 332 KB
IDT Clock Generation Overview 概要 PDF 1.83 MB
Real Time Clocks 製品概要 PDF 441 KB