The FM25L04B, a 4-Kbit SPI F-RAM, is a replacement device for the FM25L04; FM25L04 is now obsolete. The two devices are identical in terms of pinouts and read / write functionality. In terms of speed, FM25L04 operates up to 14 MHz and FM25L04B operates up to 20 MHz. This application note discusses the key differences between the two devices which need to be considered when migrating from FM25L04 to FM25L04B.
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