The FM25W256, a 256-Kbit SPI F-RAM, is a replacement device for FM25256B; FM25256B is now obsolete. The two devices are identical in terms of pinout, package dimensions and composition, read/write functionality, Write Protect operation, and address pin functionality. This application note discusses the key differences between the two devices which need to be considered when migrating from FM25256B to FM25W256.
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