AN325 - Migrating from Grade 1 version of FM25640 to Grade 1 version of FM25640B

AN325 discusses the key differences that need to be considered when migrating from Grade 1 version of FM25640 to Grade 1 version of FM25640B. FM25640 is now obsolete and this application note explains how FM25640B is a replacement for FM25640.

Introduction

FM25640B-GA, a 64-Kbit SPI Grade 1 F-RAM™, is a replacement device for FM25640-GA, which 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 that need to be considered when migrating from FM25640-GA to FM25640B-GA.