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Real-time clock ICs



Broad lineup of real-time clock ICs with Various Serial I/F.



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* LineUP
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* Technical Documents on Designing
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* Relevant Information
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* 4-wire Serial Interface (SPI Bus)
* 3-wire Serial Interface
*   2-wire Serial Interface (I2C Bus)
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Technical Documents on Designing
* Oscillator frequency calibration with CL=12.5pF crystal and Ricoh RTC IC (PDF:47KB)
*   Technical Tips to use back up switch over circuit of R2051/61 (PDF:73KB)
* Formula adjust binary code for oscillation adjustment resister (xls:35KB)

* RTC Compensation Simulator (xls:242KB)
*   User Manual RTC Compensation Simulator (PDF:340KB)
*   Design Guide for the clock circuit with a crystal and Ricoh RTC IC (PDF:90KB)
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Relevant Information
* Technical Documents
    Package Information, Mark Information, Reliability Data, Construction
 
* 4-wire Serial I/F (SPI Bus)
*   3-wire Serial I/F
*   2-wire Serial I/F (I2C Bus)
*   Package List

* RTC Quality Assurance System (PDF:294KB)
*   Recommended Land Pattern (PDF:189KB)
*   Catalog List
*   Lead (Pb) Free Information
*   Discontinued Products

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Product Catalog
Selection Guide
Selection guide is available for download in PDF format.



Lead (Pb) Free Information
All of the Lead-free products comply with RoHS Directive. RoHS Compliant


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