Abstract: Nonvolatile Y2K-compliant real-time clocks (RTCs) with battery-backed SRAM and watchdog timer provide time and date functions to microcontrollers, such as the 8051 industry standard architecture. This application note highlights an example program featuring RTCs such as a DS1556 when used with a DS5000 microcontroller. A reference design schematic is included in this application note. The application note you have requested is available in Acrobat PDF format: APPLICATION NOTE 520: Using a Watchdog Timekeeping RAM with a Microcontroller (PDF, 249kB) A free Acrobat PDF reader is available from: http://www.adobe.com/products/acrobat/readstep.html We Want Your Feedback! Automatic Updates Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™. More Information   APP 520: May 02, 2003 DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM Full Data Sheet (PDF, 484kB) Free Samples DS1554 256k Nonvolatile, Y2K-Compliant Timekeeping RAM Full Data Sheet (PDF, 376kB) Free Samples DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM Full Data Sheet (PDF, 388kB) Free Samples DS1557 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM Full Data Sheet (PDF, 388kB) Free Samples   Download, PDF Format (249kB)  AN520, AN 520, APP520, Appnote520, Appnote 520