AN321 - Migrating from Grade 1 version of FM25040A to Grade 1 version of FM25040B

AN321 discusses the key differences that need to be considered when migrating from Grade 1 version of FM25040A to Grade 1 version of FM25040B. FM25040A is now obsolete and this application note explains how FM25040B is a replacement for FM25040A.

Introduction

The FM25040B-GA, a 4-Kbit SPI Grade 1 F-RAM™, is a replacement device for FM25040A-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 FM25040A-GA to FM25040B-GA.