AN316 - Migrating from FM25640 to FM25640B

AN316 discusses the key differences that need to be considered when migrating from FM25640 to FM25640B.FM25640 is now obsolete and this application note explains how FM25640B is a replacement for FM25640.

Introduction

FM25640B, a 64-Kbit SPI F-RAM™, is a replacement device for FM25640, which 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 that need to be considered when migrating from FM25640 to FM25640B.