The FM25CL64B-GA, a 64-Kbit SPI Grade 1 F-RAM, is a replacement device for FM25CL64-GA; FM25CL64-GA is now obsolete. The two devices are identical in terms of package, pinout, DC / AC parameters, and read / write functionality. This application note discusses the key differences between the two devices which need to be considered when migrating from FM25CL64-GA to FM25CL64B-GA.
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