AN94902 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A Author: Girija Chougala Associated Project: No Associated Part Family: FM25V02, FM25V01, FM25V02A, FM25V01A Software Version: None Related Documents: For a complete list, click here AN94902 discusses the key differences that need to be considered when migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A. FM25V02/FM25V01 is now “Not Recommended for New Designs”; this application note explains how FM25V02A/FM25V01A is a replacement for FM25V02/FM25V01. Introduction TM FM25V02A/FM25V01A, a 256-Kbit/128-Kbit SPI F-RAM , is a replacement device for FM25V02/FM25V01, which is now “Not recommended for new designs.” The two devices are identical in terms of pinout, package composition and dimensions, and read/write functionality. This application note discusses the key differences between the two devices that need to be considered when migrating from FM25V02/FM25V01 to FM25V02A/ FM25V01A. Drop-In Replacement or Not? From a hardware point of view, the two devices are identical. From a software point of view, the two devices are identical except for the power-up to first-access specification (tPU) and Device ID. Refer to the Critical Considerations section for more details. Table 1 shows the compatibility chart of FM25V02/FM25V01 and FM25V02A/FM25V01A. For a detailed comparison, see Table 3. Table 1. Compatibility Chart FM25V02/FM25V01 Feature or Spec Is FM25V02A/FM25V01A 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 Ordering Part Numbers Table 2 lists the recommended FM25V02AFM25V01A ordering part numbers that correspond to the FM25V02/FM25V01 (Not Recommended for New Designs) ordering part numbers. Table 2. Recommended Ordering Part Numbers for Migration FM25V02/FM25V01 Ordering Part Number FM25V02A/FM25V01A Status FM25V02-G FM25V02-GTR FM25V02-DG FM25V02-DGTR www.cypress.com Ordering Part Number Comments Status FM25V02A-G Not Recommended for New Designs FM25V02A-GTR In production FM25V02A-DG No hardware change but software changes are required. FM25V02A-DGTR Document No. 001-94902 Rev. ** 1 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A FM25V02/FM25V01 Ordering Part Number FM25V01-G FM25V01-GTR FM25V02A/FM25V01A Status Ordering Part Number Not Recommended for New Designs FM25V01A-G Comments Status In production FM25V01A-GTR No hardware change but software changes are required. Comparison of FM25V02/FM25V01 and FM25V02A/FM25V01A Table 3 gives a detailed comparison of the two devices. Table 3. Detailed Comparison Table FM25V02/FM25V01 FM25V02A/FM25V01A -G -G (FM25V02/FM25V01) (FM25V02A/FM25V01A) -DG -DG (FM25V02) (FM25V02A) SOIC-8 SOIC-8 (FM25V02/FM25V01) (FM25V02A/FM25V01A) DFN-8 DFN-8 Package Types Pinout/Package Outlines Comments Identical “green (RoHS)” packages Identical pinout, outline and board footprint (FM25V02) (FM25V02A) Temperature Range –40 ºC to +85 ºC –40 ºC to +85 ºC Identical Operating Voltage Range 2.0 V to 3.6 V 2.0 V to 3.6 V Identical 0.22 mA @ 1 MHz 0.22 mA @ 1 MHz 2.5 mA @ 40 MHz 2.5 mA @ 40 MHz Standby Current 150 µA @ 85 ºC 150 µA @ 85 ºC Identical Sleep Current 8 µA @ 85 ºC 8 µA @ 85 ºC Identical Read / Write Function - - Identical 2-byte addressing, Identical opcodes Clock Frequency 40 MHz 40 MHz Identical 10 years (+85 ºC) 10 years (+85 ºC) 38 years (+75 ºC) 38 years (+75 ºC) 151 years (+65 ºC) 151 years (+65 ºC) Endurance (Write/Read Cycles) 1E+14 1E+14 Identical Power-Up to First Access (tPU) 250 µs 1 ms FM25V02A/FM25V01A is slower in first access 7F7F7F7F7F7FC22100h (FM25V01) 7F7F7F7F7F7FC22108h (FM25V01A) 7F7F7F7F7F7FC22200h 7F7F7F7F7F7FC22208h (FM25V02) (FM25V02A) Clock HIGH time (tCH) 20 ns 18 ns FM25V02A/FM25V01A has better spec Clock LOW time (tCL) 20 ns 18 ns FM25V02A/FM25V01A has better spec Output data valid time (tODV) 18 ns 16 ns FM25V02A/FM25V01A has better spec Active Supply Current Data Retention Device ID www.cypress.com Document No. 001-94902 Rev. ** Identical Identical Different. Refer to “Critical Considerations” for more details. 2 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to FM25V02A/FM25V01A. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. Power-Up to First Access The power-up to first access specification is slower in FM25V02A/FM25V01A device. Ensure that the FM25V02A/FM25V01A device is accessed only after 1 ms from power-up. Device ID Feature The FM25V02A/FM25V01A and FM25V02/FM25V01 incorporate a 9-byte read-only Device ID to identify the product uniquely. The Device ID allows the host to determine the manufacturer, product density, and product revision. Table 4 gives a Device ID of FM25V02/FM25V01 and FM25V02A/FM25V01A. A system software update is required to use this feature when migrating to the FM25V02A/FM25V01A. Table 4. Device ID Device ID FM25V01 FM25V01A 7F7F7F7F7F7FC22100h 7F7F7F7F7F7FC22108h FM25V02 FM25V02A 7F7F7F7F7F7FC22200h 7F7F7F7F7F7FC22208h 1. Device ID difference is highlighted in red color Summary AN94902 discussed the differences between FM25V02/FM25V01 and FM25V02A/FM25V01A that need to be considered during migration to the FM25V02A/FM25V01A. www.cypress.com Document No. 001-94902 Rev. ** 3 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A Related Documents Datasheet FM25V02A: 256-Kbit (32K × 8) Serial (SPI) F-RAM FM25V01A: 128-Kbit (16K × 8) Serial (SPI) F-RAM Application Note AN304 – SPI GUIDE FOR F-RAM www.cypress.com Document No. 001-94902 Rev. ** 4 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A Document History Document Title: Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A - AN94902 Document Number: 001-94902 Revision ** ECN 4652338 www.cypress.com Orig. of Change GVCH Submission Date 03/17/2015 Description of Change New Spec. Document No. 001-94902 Rev. ** 5 Migrating from FM25V02/FM25V01 to FM25V02A/FM25V01A 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. 001-94902 Rev. ** 6