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AN61546 - Nonvolatile Static Random Access Memory (nvSRAM) Real Time Clock (RTC) Design Guidelines and Best Practices | Cypress Semiconductor

AN61546 - Nonvolatile Static Random Access Memory (nvSRAM) Real Time Clock (RTC) Design Guidelines and Best Practices

Last Updated: 
Feb 18, 2018

AN61546 describes the RTC functionality, component selection criteria, and best layout design practices for the nvSRAM RTC design. The guidelines and best practices covered in this application note are intended to assist you in designing nvSRAM with RTC functions in your system design and to minimize timing errors, which mostly occur due to improper layout design and component selection.


The nvSRAM RTC integrates standard real time clock functions and nonvolatile SRAM functions. Applications such as servers, security and surveillance systems, industrial controllers, data loggers, and single-board computers are just a few system examples that require RTC functions to operate the system reliably and accurately. Integrated RTC functions along with the nvSRAM provide multiple advantages such as enabling infinite write into SRAM of nvSRAM, automatic data saving during power down, and allowing the systems to log critical information continuously into nonvolatile memory with time stamping.

nvSRAM with RTC Diagram

(Note: Either Capacitor or Battery should be connected for RTC backup.)

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