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AN6081 - Interfacing 90-nm Cypress Asynchronous SRAMs in Legacy Systems | 赛普拉斯半导体

AN6081 - Interfacing 90-nm Cypress Asynchronous SRAMs in Legacy Systems

2018 年 2 月 18 日

Click here to download Application Note (PDF File)

AN6081 describes the potential issues faced when using the new-generation 90-nm Cypress SRAMs in applications that rely on legacy 5-V processors. This application note also discusses the troubleshooting methods on output voltage issues when migrating to the new devices. Usage recommendations when you opt to use Cypress SRAMs in such applications are also provided.


Applications have evolved from using 5-V power supply to using 3-V and 1.8-V supply. Cypress’s Asynchronous SRAM devices operate over all of these voltage ranges. This application note discusses a case of incompatibility between output voltage thresholds of 90-nm SRAM devices and input voltage thresholds of processors or controllers that are interfaced with these SRAMs in legacy 5-V systems. A recommendation to use an old generation Cypress SRAM is given to match the requirements in such cases.

Please see the illustrations and the application note below for details.

Processor receiving data from SRAM on a read operation:


SRAM in Output Mode Diagram

Actual V OH SRAM Diagram

Dear valued customer,

Thank you for choosing our products. They come with all the know-how and passion that our engineers have put into it. As you probably already know, Cypress is now Infineon. This is a major step for our company, but also for the good of you. 

Reliability and business continuity are of utmost importance for us. Hence, we remain fully committed to honoring existing customer and distributor relationships. This includes offering the legacy Cypress product portfolio. We thank you very much for your trusting support.

For the full version of this message, please download the PDF version.