AN309 Migrating from FM25L512 to FM25V05 Author: Girija Chougala Associated Project: No Associated Part Family: FM25L512, FM25V05 Software Version: None Related Documents: For a complete list, click here AN309 discusses the key differences that need to be considered when migrating from FM25L512 to FM25V05. FM25L512 is now obsolete and this application note explains how FM25V05 is a replacement for FM25L512. Table 1. Compatibility Chart Introduction FM25V05, a 512-Kbit SPI F-RAM™, is a replacement device for FM25L512, which is now obsolete. For most designs, the FM25V05 device can be considered a superset of the FM25L512. The two devices are identical in terms of pinout and read/write functionality. This application note discusses the key differences between the two devices that need to be considered when migrating from FM25L512 to FM25V05. FM25L512 Feature or Spec Yes[1] Package 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 the FM25V05’s package and higher standby current. The FM25V05 adds many features like operation down to 2.0 V, sleep mode, Device ID and higher speed capability. Table 1 shows the compatibility chart of FM25L512 and FM25V05. For a detailed comparison, see Table 3. Is FM25V05 compatible? Pinout Yes Temperature Range Yes Operating Voltage Yes Operating Current Yes Standby Current No Read / Write Function Yes Timing / Frequency Yes Data Retention Yes Endurance Yes Note: 1. PCB footprint is compatible. Ordering Part Numbers Table 2 gives the recommended FM25V05 ordering part numbers that correspond to the now obsolete FM25L512 ordering part numbers. Table 2. Recommended Ordering Part Numbers for Migration FM25L512 Ordering Part Number FM25L512-DG FM25L512-DGTR www.cypress.com FM25V05 Status Obsolete Ordering Part Number FM25V05-G Comments Status In production FM25V05-GTR Document No. 001-86832 Rev. *B No hardware or software change is required. Software update is required if you wish to use the additional Sleep Mode and Device ID feature supported in FM25V05. 1 Migrating from FM25L512 to FM25V05 Comparison of FM25L512 and FM25V05 Table 3 gives a detailed comparison of the two devices. Table 3. Detailed Comparison Package Type Package Outline Pinout Temperature Range Operating Voltage Range FM25L512 FM25V05 Comments -DG -G “Green” packages. TDFN vs. SOIC, but are footprint compatible (5 mm x 6 mm TDFN). TDFN-8 SOIC-8 Outline is different but the board footprint is Identical - - Identical –40 ºC to +85 ºC –40 ºC to +85 ºC Identical 3.0 V to 3.6 V 2.0 V to 3.6 V FM25V05 allows operation down to 2.0 V 600 µA @ 1 MHz 300 µA @ 1 MHz 12.0 mA @ 20 MHz 3.0 mA @ 40 MHz 20 µA 150 µA Sleep Mode Current - 8 µA FM25V05 offers a sleep mode which can be used to reduce the standby/idle current. During wake-up from sleep mode, the device has a recovery time of 400 µs. Read / Write Function - - Identical 2-byte addressing, Identical opcodes 20 MHz 40 MHz Active Supply Current Standby Current Clock Frequency FM25V05 offers lower active current even at low frequency FM25V05 has higher standby current FM25V05 offers higher speed 10 years (+85 ºC) Data Retention 10 years (+85 ºC) 38 years (+75 ºC) Identical 151 years (+65 ºC) Endurance (Write/Read Cycles) VDD Power-Up Ramp Rate (tVR) VDD Power-Down Ramp Rate (tVF) Power-Up to First Access (tPU) Unlimited 1E+14 50 µs / V 50 µs / V 1000 µs / V (VDD less than 2 V) FM25V05‘s endurance is large enough to be considered as unlimited for all practical applications. For a 64-byte loop, at 20 MHz, FM25V05’s endurance is 85 years. Identical 100 µs / V 10 ms 0.25 ms HOLD pin pull-up - Internal pull-up Device ID Feature - Yes FM25V05 is faster to first access FM25V05 does not require any external pull-up resistor Additional feature in FM25V05 Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to FM25V05. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. Package Outline The FM25V05 is offered in SOIC-8 package while the FM25L512 is offered in TDFN-8 package. But both the packages have compatible footprint (5 mm x 6 mm). However this package difference should be considered while migrating. www.cypress.com Document No. 001-86832 Rev. *B 2 Migrating from FM25L512 to FM25V05 Standby Current / Sleep Mode Current FM25V05 has higher standby current of 150 µA compared to FM25L512. But FM25V05 offers an additional sleep mode which can be used to reduce the standby/idle current. The sleep mode current is as low as 8 µA. Note that during wake-up from the sleep mode, device needs a recovery time of 400 µs. New Feature: Devi ce ID The FM25V05 incorporates a 9-byte read only Device ID (7F7F7F7F7F7FC22300h) to identify the product uniquely. The Device ID allows the host to determine the manufacturer, product density, and product revision. Software update is required when you wish to use this feature in FM25V05. Summary AN309 discussed the differences between FM25L512 and FM25V05 that need to be considered during migration to the FM25V05. Related Documents Datasheet FM25V05: 512-Kbit (64 K × 8) Serial (SPI) F-RAM datasheet Application Note AN304 – SPI GUIDE FOR F-RAM www.cypress.com Document No. 001-86832 Rev. *B 3 Migrating from FM25L512 to FM25V05 Document History Document Title: Migrating from FM25L512 to FM25V05 - AN309 Document Number: 001-86832 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. Updated operating voltage for FM25L512 from “2.7 V to 3.6 V” to “3.0 V to 3.6 V”. *B 4498652 GVCH 09/19/2014 Changed title from “Differences between FM25L512 and FM25V05” to “Migrating from FM25L512 to FM25V05.” Updated abstract. Added “Ordering Part Numbers” section. Added title for Table 3. Added “Related Documents” section. www.cypress.com Document No. 001-86832 Rev. *B 4 Migrating from FM25L512 to FM25V05 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. PSoC® Solutions Products Automotive cypress.com/go/automotive psoc.cypress.com/solutions Clocks & Buffers cypress.com/go/clocks PSoC 1 | PSoC 3 | PSoC 4 | PSoC 5LP Interface cypress.com/go/interface Lighting & Power Control cypress.com/go/powerpsoc cypress.com/go/plc Memory cypress.com/go/memory PSoC cypress.com/go/psoc Touch Sensing cypress.com/go/touch USB Controllers cypress.com/go/usb Wireless/RF cypress.com/go/wireless Cypress Developer Community Community | Forums | Blogs | Video | Training Technical Support cypress.com/go/support PSoC is a registered trademark of Cypress Semiconductor Corp. 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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. 001-86832 Rev. *B 5