AN214 Migrating from FM24C16A to FM24C16B Author: Girija Chougala Associated Project: No Associated Part Family: FM24C16A, FM24C16B Software Version: None Related Documents: For a complete list, click here AN214 discusses the key differences that need to be considered when migrating from FM24C16A to FM24C16B. FM24C16A is now obsolete and this application note explains how FM24C16B is a replacement for FM24C16A. Table 1 shows the compatibility chart of FM24C16A and FM24C16B. For a detailed comparison, see Table 3. Introduction 2 The FM24C16B, a 16-Kbit I C F-RAM™, is a replacement device for FM24C16A, which is now obsolete. The two devices are identical in terms of pinout, package composition and dimensions, read / write functionality, Write Protect operation, and address pin functionality. This application note discusses the key differences between the two devices that need to be considered when migrating from FM24C16A to FM24C16B. Table 1. Compatibility Chart FM24C16A Feature or Spec Drop-In Replacement or Not? For all designs, FM24C16B is a drop-in replacement for FM24C16A. From a software point of view, the two devices are identical. From a hardware point of view the key difference is the lower active current in FM24C16B. Additionally, FM24C16B datasheet adds a power-up and power-down ramp rate specification of 30 µs / V and a power-up to first-access specification of 1 ms. Is FM24C16B compatible? Package Yes Pinout Yes Temperature Range Yes Operating Voltage Yes Operating Current Yes Standby Current Yes Read / Write Function Yes Timing / Frequency Yes Data Retention Refer to Table 3 Endurance Yes Ordering Part Numbers Table 2 gives the recommended FM24C16B ordering part numbers that correspond to the now obsolete FM24C16A ordering part numbers. Table 2. Recommended Ordering Part Numbers for Migration FM24C16A Ordering Part Number FM24C16A-G FM24C16A-GTR www.cypress.com FM24C16B Status Obsolete Ordering Part Number FM24C16B-G Comments Status In production FM24C16B-GTR Document No. 001-86821 Rev. *B No hardware or software change is required. 1 Migrating from FM24C16A to FM24C16B Comparison of FM24C16A and FM24C16B Table 3 gives a detailed comparison of the two devices. Table 3. Detailed Comparison Package Types Package Outlines Pinout Temperature Range Operating Voltage Range Active Supply Current Standby Current Read / Write Function Clock Frequency FM24C16A FM24C16B Comments -G -G SOIC-8 SOIC-8 - - Identical –40 ºC to +85 ºC –40 ºC to +85 ºC Identical 4.5 V to 5.5 V 4.5 V to 5.5 V Identical 150 µA @ 100 kHz 100 µA @ 100 kHz 1000 µA @ 1 MHz 400 µA @ 1 MHz 10 µA 10 µA - - 1 MHz 1 MHz Identical, “green” SOIC package Identical outline and board footprint FM24C16B offers lower active current at all clock rates Identical Identical 1-byte addressing, Identical Slave IDs Identical 10 years (+85 ºC) Data Retention 45 years (+85 ºC) 38 years (+75 ºC) Data retention is lower. 151 years (+65 ºC) Endurance (Write/Read Cycles) 1E+12 1E+14 FM24C16B has better endurance VDD Power-Up Ramp Rate (tVR) - 30 µs / V Power-up ramp rate should be slower than 30 µs / V for FM24C16B VDD Power-Down Ramp Rate (tVF) - 30 µs / V Power-down ramp rate should be slower than 30 µs / V for FM24C16B Power-Up to First Access (tPU) - 1 ms After power-up, the first access of FM24C16B should be after 1 ms Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to FM24C16B. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. VDD Ramp Rate VDD power-up and power-down ramp rate specifications are added in FM24C16B device. Ensure that the power-up and power-down ramp rates are slower than 30 µs / V in your system. Power-Up to First Access Power-up to first access specification is added in FM24C16B device. Ensure that the FM24C16B device is accessed only after 1 ms from power-up. Summary AN214 discussed the differences between FM24C16A and FM24C16B that need to be considered during migration. www.cypress.com Document No. 001-86821 Rev. *B 2 Migrating from FM24C16A to FM24C16B Related Documents Datasheet 2 FM24C16B: 16-Kbit (2 K × 8) Serial (I C) F-RAM datasheet www.cypress.com Document No. 001-86821 Rev. *B 3 Migrating from FM24C16A to FM24C16B Document History Document Title: Migrating from FM24C16A to FM24C16B - AN214 Document Number: 001-86821 Revision ECN Orig. of Change Submission Date Description of Change ** 3944550 GVCH 03/26/2013 New Spec. *A 4278231 MEDU 03/05/2014 Updated to Cypress Template. Added data retention spec to FM24C16B at 85 ºC. Updated "Power-up to First Access" for FM24C16B from 10 ms to 1 ms. Updated "VDD Power-down Ramp Rate" for FM24C16B from 100 µs / V to 30 µs / V. Removed VIH(max) spec from Table 2. *B 4498650 GVCH 09/10/2014 Changed title from “Differences between FM24C16A and FM24C16B” to “Migrating from FM24C16A to FM24C16B.” Updated abstract. Added “Ordering Part Numbers” section. Added title for Table 3. Added “Related Documents” section. www.cypress.com Document No. 001-86821 Rev. *B 4 Migrating from FM24C16A to FM24C16B Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at Cypress Locations. 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Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Use may be limited by and subject to the applicable Cypress software license agreement. www.cypress.com Document No. 001-86821 Rev. *B 5