AN211 Migrating from FM24CL16 to FM24CL16B Author: Girija Chougala Associated Project: No Associated Part Family: FM24CL16, FM24CL16B Software Version: None Related Documents: For a complete list, click here AN211 discusses the key differences which need to be considered when migrating from FM24CL16 to FM24CL16B. FM24CL16 is now obsolete and this application note explains how FM24CL16B is a replacement for FM24CL16. Table 1 shows the compatibility chart of FM24CL16 and FM24CL16B. For a detailed comparison, see Table 3. Introduction 2 FM24CL16B, a 16-Kbit I C F-RAM™, is a replacement device for FM24CL16, which is now obsolete. The two devices are identical in terms of pinout, 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 FM24CL16 to FM24CL16B. Table 1. Compatibility Chart FM24CL16 Feature or Spec Is FM24CL16B compatible? Yes (SOIC) Package No (TDFN) Pinout Yes Drop-In Replacement or Not? Temperature Range Yes From a software point of view, the two devices are identical. From a hardware point of view, FM24CL16B has slightly higher standby current compared to FM24CL16. Additionally, FM24CL16B 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. Also, the footprint for the TDFN package of the FM24CL16B is different compared to that of FM24CL16 and hence would need hardware change when migrating. Operating Voltage Yes Operating Current Yes Standby Current No Read / Write Function Yes Timing / Frequency Yes Data Retention Refer to Table 3 Endurance Yes Ordering Part Numbers Table 2 gives the recommended FM24CL16B ordering part numbers that correspond to the now obsolete FM24CL16 ordering part numbers. Table 2. Recommended Ordering Part Numbers for Migration FM24CL16 Ordering Part Number FM24CL16-G FM24CL16B Status Obsolete FM24CL16-GTR FM24CL16-DG Ordering Part Number FM24CL16B-G Comments Status In production FM24CL16B-GTR Obsolete FM24CL16B-DG No hardware or software change is required. In production Hardware change is required. FM24CL16-DGTR www.cypress.com FM24CL16B-DGTR Document No. 001-86817 Rev. *B 1 Migrating from FM24CL16 to FM24CL16B Comparison of FM24CL16 and FM24CL16B 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 FM24CL16 FM24CL16B -G, -DG -G, -DG SOIC-8, SOIC-8, TDFN-8 (3 mm x 6.4 mm) TDFN-8 (4 mm x 4.5 mm) - - Identical –40 ºC to +85 ºC –40 ºC to +85 ºC Identical 2.7 V to 3.65 V 2.0 V to 3.65 V 75 µA @ 100 kHz 100µA @ 100 kHz 450 µA @ 1 MHz 300µA @ 1 MHz 1 µA (max) 6 µA (max) 3 µA (typical) - - 1 MHz 1 MHz Comments Identical “green” SOIC “Green” TDFN package package, different Package outline and board footprint are Identical for SOIC but different for TDFN FM24CL16B offers a wider operating range FM24CL16B 1 MHz offers lower active current at FM24CL16B has higher standby current 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) Unlimited 1E+14 FM24CL16B’s endurance is large enough to be considered as unlimited for all practical applications. For a 64-byte loop, at 1 MHz, FM24CL16B’s endurance is 1700 years. VDD Power-Up Ramp Rate (tVR) - 30 µs / V Power-up ramp rate should be slower than 30 µs / V for FM24CL16B VDD Power-Down Ramp Rate (tVF) - 30 µs / V Power-down ramp rate should be slower than 30 µs / V for FM24CL16B Power-Up to First Access (tPU) - 1 ms After power-up, the first access of FM24CL16B should be after 1 ms Endurance (Write/Read Cycles) 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. Package Outline Both FM24CL16 and FM24CL16B are offered in SOIC and TDFN packages. While the SOIC package dimensions are Identical, there is a difference in TDFN package dimensions. The FM24CL16 package dimensions are 3 mm x 6.4 mm and the FM24CL16B package dimensions are 4 mm x 4.5 mm. Hence the package footprints will be different. Though the package type (-DG) is Identical for the two devices, this difference in package footprints should be considered during migration. VDD Ramp Rate VDD power-up and power-down ramp rate specifications are added in FM24CL16B device. Ensure that the power-up and power-down ramp rates are slower than 30 µs / V in your system. www.cypress.com Document No. 001-86817 Rev. *B 2 Migrating from FM24CL16 to FM24CL16B Power-Up to First Access Power-up to first access specification is added in FM24CL16B device. Ensure that the FM24CL16B device is accessed only after 1 ms from power-up. Summary AN211 discussed the differences between FM24CL16 and FM24CL16B which need to be considered during migration. Related Documents Datasheet 2 FM24CL16B: 16-Kbit (2 K × 8) Serial (I C) F-RAM datasheet www.cypress.com Document No. 001-86817 Rev. *B 3 Migrating from FM24CL16 to FM24CL16B Document History Document Title: Migrating from FM24CL16 to FM24CL16B - AN211 Document Number: 001-86817 Revision ECN Orig. of Change Submission Date Description of Change ** 3944550 GVCH 03/26/2013 New Spec. *A 4278231 MEDU 03/07/2014 Updated to Cypress Template. Updated Active Supply Current for FM24CL16 from “70 µA @ 100 kHz, 400 µA @ 1 MHz” to “75 µA @ 100 kHz, 450 µA @ 1 MHz”. Added data retention spec to FM24CL16B at 85 ºC. Updated "Power-up to First Access" for FM24CL16B from 10 ms to 1 ms. Updated "VDD Power-down Ramp Rate" for FM24CL16B 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 FM24CL16 and FM24CL16B” to “Migrating from FM24CL16 to FM24CL16B.” Updated abstract. Added “Ordering Part Numbers” section. Added title for Table 3. Added “Related Documents” section. www.cypress.com Document No. 001-86817 Rev. *B 4 Migrating from FM24CL16 to FM24CL16B 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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