AN98047 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ Author: Girija Chougala Associated Part Family: FM25V02, FM25V01, CY15B256Q, CY15B128Q Related Documents: For a complete list, click here AN98047 discusses the key differences that need to be considered when migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM. FM25V02/FM25V01 is now “Not Recommended for New Designs”; this application note explains how CY15B256Q/CY15B128Q is a replacement for FM25V02/FM25V01. 1 Introduction CY15B256Q/CY15B128Q, a 256-Kbit/128-Kbit Automotive 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 CY15B256Q/CY15B128Q. 2 Device Compatibility 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 CY15B256Q/CY15B128Q. For a detailed comparison, see Table 3. Table 1. Compatibility Chart FM25V02/FM25V01 Feature or Spec www.cypress.com Is CY15B256Q/CY15B128Q 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 Document No. 001-98047 Rev. ** 1 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ 3 Ordering Part Numbers Table 2 lists the recommended CY15B256Q/CY15B128Q 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 CY15B256Q/CY15B128Q Status Ordering Part Number FM25V02-G FM25V02-GTR FM25V01-G Status CY15B256Q-SXA CY15B256Q -SXAT Not Recommended for New Designs In production CY15B128Q -SXA FM25V01-GTR 4 Comments No hardware change but software changes are required. CY15B128Q -SXAT Comparison of FM25V02/FM25V01 and CY15B256Q/CY15B128Q Table 3 provides a detailed comparison of the two devices. Table 3. Detailed Comparison Table FM25V02/FM25V01 CY15B256Q/CY15B128Q Comments Package Types -G -G Identical “green (RoHS)” packages Pinout/Package Outlines SOIC-8 SOIC-8 Identical pinout, outline and board footprint 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 CY15B256Q/CY15B128Q is slower in first access 7F7F7F7F7F7FC22100h (FM25V01) 7F7F7F7F7F7FC22188h (CY15B128Q) 7F7F7F7F7F7FC22200h 7F7F7F7F7F7FC22288h (FM25V02) (CY15B256Q) Clock HIGH time (tCH) 20 ns 18 ns CY15B256Q/CY15B128Q has better spec Clock LOW time (tCL) 20 ns 18 ns CY15B256Q/CY15B128Q has better spec Output data valid time (tODV) 18 ns 16 ns CY15B256Q/CY15B128Q has better spec Active Supply Current Data Retention Device ID www.cypress.com Document No. 001-98047 Rev. ** Identical Identical Different. Refer to “Critical Considerations” for more details. 2 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ 5 Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to CY15B256Q/CY15B128Q. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. 5.1 Power-Up to First Access The power-up to first access specification (tPU) is slower in CY15B256Q/CY15B128Q device. Ensure that the CY15B256Q/CY15B128Q device is accessed only after 1 ms from power-up. 5.2 Device ID Feature The CY15B256Q/CY15B128Q 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 CY15B256Q/CY15B128Q. A system software update is required to use this feature when migrating to the CY15B256Q/CY15B128Q. Table 4. Device ID [Note] Device ID FM25V01 CY15B128Q 7F7F7F7F7F7FC22100h 7F7F7F7F7F7FC22188h FM25V02 CY15B256Q 7F7F7F7F7F7FC22200h 7F7F7F7F7F7FC22288h Note: Device ID difference highlighted in red color. www.cypress.com Document No. 001-98047 Rev. ** 3 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ 6 Summary AN98047 discussed the differences between FM25V02/FM25V01 and CY15B256Q/CY15B128Q that need to be considered during migration to the CY15B256Q/CY15B128Q. 7 Related Documents Datasheets CY15B256Q: 256-Kbit (32K × 8) Automotive Serial (SPI) F-RAM CY15B128Q: 128-Kbit (16K × 8) Automotive Serial (SPI) F-RAM Application Note AN304 – SPI GUIDE FOR F-RAM www.cypress.com Document No. 001-98047 Rev. ** 4 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ Document History Document Title: AN98047 - Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ Document Number: 001-98047 Revision ** ECN 4800997 www.cypress.com Orig. of Change GVCH Submission Date 06/17/2015 Description of Change New application note Document No. 001-98047 Rev. ** 5 Migrating from FM25V02/FM25V01 to CY15B256Q/CY15B128Q Automotive F-RAM™ Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. 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