AN310 Differences between FM25H20 and FM25V20 Author: Harsha Medu Associated Project: No Associated Part Family: FM25H20, FM25V20 Software Version: None Related Application Notes: None AN310 discusses the key differences which need to be considered when migrating from FM25H20 to FM25V20. Table 1. Compatibility Chart Description The FM25V20, a 2-Mbit Serial SPI F-RAM, is a replacement device for FM25H20; FM25H20 is an old part which is not recommended for new designs. For most designs, the FM25V20 device can be considered as a superset of the FM25H20. The two devices are identical in terms of pinout, package dimensions and composition, and read / write functionality. This application note discusses the key differences between the two devices which need to be considered when migrating from FM25H20 to FM25V20. FM25H20 Feature or Spec Drop-In Replacement or Not? From a software point of view, the two devices are identical. From a hardware point of view, the key differences between the two devices are lower active and standby currents in FM25V20. The FM25V20 also adds features like operation down to 2.0 V and Device ID. A compatibility chart for the two devices is given in Table 1. A detailed comparison is shown in Table 2. Is FM25V20 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 Yes Endurance Yes . Table 2. Detailed Comparison Table FM25H20 FM25V20 -G, -DG -G, -DG Pinout SOIC-8, TDFN-8 SOIC-8, TDFN-8 Same TDFN and wide SOIC (208 Mils) packages Temperature Range –40 ºC to +85 ºC –40 ºC to +85 ºC Same 2.7 V to 3.6 V 2.0 V to 3.6 V FM25V20 allows operation down to 2.0 V FM25V20 offers lower active current even at low frequency Package Types Operating Voltage Range Active Supply Current Standby Current Sleep Mode Current www.cypress.com 1.0 mA @ 1 MHz 300 µA @ 1 MHz 10.0 mA @ 40 MHz 3.0 mA @ 40 MHz 270 µA @ 85 ºC 250 µA @ 85 ºC 8 µA 8 µA Document No. 001-86833 Rev. *A Comments Same “Green” packages FM25V20 has a slightly lower standby current Same. During wake-up from sleep mode, the device has a recovery time of 450 µs. 1 Differences between FM25H20 and FM25V20 Output LOW Voltage (VOL) Read / Write Function Clock Frequency Data Retention Endurance FM25H20 FM25V20 Comments 0.4 V @ IOL = 1.6 mA 0.4 V @ IOL = 2 mA - - 40 MHz 40 MHz Same 10 years (+85 ºC) 10 years (+85 ºC) Same 1E+14 1E+14 Same FM25V20 has better output LOW specification Same 2-byte addressing, same op-codes VDD Power-Up Ramp Rate (tVR) 50 µs / V 50 µs / V Same VDD Power-Down Ramp Rate (tVF) 100 µs / V 100 µs / V Same 1 ms 1 ms Same - Yes Power-Up to First Access (tPU) Device ID Feature Critical Considerations All the parameter differences in Table 2 should be considered during the migration to FM25V20. From the table, it can be seen that FM25V20 is a superset of FM25H20. System designers are recommended to review the detailed datasheets when migrating to the new part. Conclusion AN310 discusses the differences between FM25H20 and FM25V20 which need to be considered during migration. www.cypress.com Document No. 001-86833 Rev. *A 2 Differences between FM25H20 and FM25V20 Document History Document Title: Differences between FM25H20 and FM25V20 - AN310 Document Number: 001-86833 Revision ECN Orig. of Change Submission Date Description of Change ** 3944550 GVCH 03/26/2013 New Spec. *A 4278908 MEDU 03/07/2014 Updated to Cypress Template. www.cypress.com Document No. 001-86833 Rev. *A 3 Differences between FM25H20 and FM25V20 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. 001-86833 Rev. *A 4