Infineon Technologies

FM25CL64B-GTR

A: The FM25CL64B-GTR offers ultra‑low power consumption, fast access times, and virtually unlimited endurance. The table below summarises its core specifications: Specification Value Memory Density 64 Kbit (8 Kbyte) Memory Organization 8K × 8 bits Memory Interface SPI (Serial Peripheral Interface) Max Clock Frequency (fSCK) 20 MHz Access Time 25 ns (at 20 MHz) Write Cycle Time No write delay (immediate write) Supply Voltage (VDD) 2.7 V to 3.65 V Active Current 1.0 mA (typical at 1 MHz) Standby Current 10 μA (typical) Operating Temperature –40°C to +85°C (industrial grade) Package 8‑pin SOIC (150 mil) RoHS Status RoHS compliant, lead‑free Additional features include: No write delays – Writes occur at bus speed with no polling required. High endurance – Virtually unlimited read/write cycles (10¹⁴ cycles). Data retention – 151 years at +85°C (typical). Automatic data protection on power‑loss. SPI Mode 0 and Mode 3 compatibility. Hardware write protection via WP pin.

A: The FM25CL64B-GTR uses a standard 4‑wire SPI bus, supporting both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) for maximum compatibility with a wide range of microcontrollers and SoCs. The interface consists of the following pins: CS (Chip Select): Enables the device when driven low. SCK (Serial Clock): Provides the clock signal for data transfer (up to 20 MHz). SI (Serial Data Input): Transmits data from the host to the device. SO (Serial Data Output): Transmits data from the device to the host. In addition to the standard SPI signals, the device features: WP (Write Protect): When tied low, write operations to the entire memory array are inhibited. HOLD: Allows the host to pause an ongoing serial communication without resetting the sequence. Unlike EEPROM or Flash, the F‑RAM requires no write cycle time – the write operation completes immediately after the last bit of the data word is clocked in, eliminating the need for polling or wait states.

A: The FM25CL64B-GTR is engineered for extreme durability and long‑term data retention. Key reliability specifications include: Reliability Parameter Specification Write Endurance 10¹⁴ (100 trillion) read/write cycles – virtually unlimited Data Retention 151 years at +85°C (typical) Write Cycle Time No write delay (immediate write) Operating Temperature –40°C to +85°C (industrial grade) Unlike EEPROM and Flash, which degrade after 10⁵–10⁶ cycles, F‑RAM can be written repeatedly without wear‑leveling or lifetime concerns. The device also features automatic power‑off data protection to prevent corruption during unstable power‑down events.

A: Thanks to its 64‑Kbit capacity, high‑speed SPI interface (20 MHz), ultra‑low power consumption, virtually unlimited endurance, and industrial temperature range, the FM25CL64B-GTR is well‑suited for applications requiring frequent, fast, and reliable non‑volatile data storage. Typical use cases include: Data logging – Continuous recording of sensor data, events, or system parameters without endurance limitations. Configuration storage – Frequently updated settings, calibration constants, and user preferences. State saving – Capturing system state before power‑loss in battery‑backed or energy‑harvesting devices. Automotive electronics – Black box data recorders, infotainment systems, and advanced driver‑assistance systems (ADAS). Industrial control – PLCs, HMIs, smart meters, and robotics. Medical devices – Patient monitors, infusion pumps, and portable diagnostic equipment. ⚠️ Important Lifecycle Information: The product lifecycle status for the FM25CL64B-GTR is Active / In Production. The manufacturer (Infineon) continues to produce this device, and multiple major distributors (DigiKey, Mouser, Farnell) list the part as Active with standard lead times. However, some distributor databases show the part as NRND (Not Recommended for New Designs) or Obsolete – likely reflecting older F‑RAM generations. Infineon explicitly recommends FM25CL64B-GTR as an active replacement for the obsolete FM25CL64-G. For new designs requiring a 64‑Kbit SPI F‑RAM, the FM25CL64B-GTR remains a suitable, actively‑produced choice. Designers are advised to verify current lifecycle status directly with an authorised Infineon distributor.