The FM25640B, a 64-Kbit SPI F-RAM, is a replacement device for FM25640; FM25640 is now obsolete. The two devices are identical in terms of pinouts and read/write functionality. In terms of speed, the FM25640 operates up to 5 MHz while the FM25640B operates up to 20 MHz. This application note discusses the key differences between the two devices which need to be considered when migrating from FM25640 to FM25640B.
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