Real-Time Clock With Battery Backed Non-Volatile RAM

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.

Features

  • 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)

Product Options

Orderable Part ID Part Status Core Voltage (V) Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
1338-18DCGI Active 1.8, 2.5, 3.3, 5, 5.5 DCG8 SOIC 8 I Yes Tube Availability
1338-18DCGI8 Active 1.8, 2.5, 3.3, 5, 5.5 DCG8 SOIC 8 I Yes Reel Availability
1338-18DVGI Active 1.8, 2.5, 3.3, 5, 5.5 DVG8 TSSOP 8 I Yes Tube Availability
1338-18DVGI8 Active 1.8, 2.5, 3.3, 5, 5.5 DVG8 TSSOP 8 I Yes Reel Availability
1338-31DCGI Active 2.5, 3.3, 5, 5.5 DCG8 SOIC 8 I Yes Tube Availability
1338-31DCGI8 Active 2.5, 3.3, 5, 5.5 DCG8 SOIC 8 I Yes Reel Availability
1338-31DVGI Active 2.5, 3.3, 5, 5.5 DVG8 TSSOP 8 I Yes Tube Availability
1338-31DVGI8 Active 2.5, 3.3, 5, 5.5 DVG8 TSSOP 8 I Yes Reel Availability
1338AC-18SRGI Active 1.8, 2.5, 3.3, 5, 5.5 PIG16 SOIC 16 I Yes Tube Availability
1338AC-18SRGI8 Active 1.8, 2.5, 3.3, 5, 5.5 PIG16 SOIC 16 I Yes Reel Availability
1338AC-31SRGI Active 2.5, 3.3, 5, 5.5 PIG16 SOIC 16 I Yes Tube Availability
1338AC-31SRGI8 Active 2.5, 3.3, 5, 5.5 PIG16 SOIC 16 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
1338 Datasheet Datasheet PDF 261 KB Nov 12, 2014
Errata# : UEN-13-01 Datasheet Errata PDF 421 KB Feb 20, 2013
1338B-31 Datasheet Datasheet PDF 427 KB Apr 10, 2012
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 12, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 6, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 6, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
PCNs & PDNs
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 13, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 14, 2016
PDN# : CQ-14-08 Manufacturing Discontinunce PDN Product Discontinuation Notice PDF 486 KB Nov 30, 2014
PCN# : A1403-03 Gold wire to Copper wire Product Change Notice PDF 42 KB Oct 14, 2014
PCN# : W1101-02R4 Fab 4 to TSMC Product Change Notice PDF 70 KB Jun 30, 2014
PCN# : W1101-02R3 Fab 4 to TSMC Product Change Notice PDF 71 KB Apr 7, 2014
PCN# : W1101-02R2 Fab 4 to TSMC Product Change Notice PDF 67 KB Jan 25, 2014
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 20, 2012
PCN# : A1208-06 Changed of Assembly Location and Crystal Product Change Notice PDF 1.06 MB Nov 17, 2012
PCN# : A1204-01R1 Revised Notification to Remove Selective Devices from TSSOP-16 Product Change Notice PDF 332 KB Oct 1, 2012
Other
The IDT Consumer Products Advantage Overview PDF 4.01 MB Jun 30, 2017
The IDT Communications Products Advantage Overview PDF 2.54 MB Feb 13, 2017
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016
Real Time Clocks Product Brief PDF 441 KB Apr 30, 2008