Infineon Technologies FM24CL64B-DGTR

Overview

FM24CL64B-DGTR from Cypress Semiconductor is a 64-Kbit (8K × 8) serial I²C ferroelectric RAM (F-RAM) with no write delay, 10¹⁴ read/write endurance, and 151-year data retention at industrial temperature (–40 °C to +85 °C). It operates from 2.7 V to 3.65 V and supports up to 1-MHz I²C bus speed - enabling real-time nonvolatile logging in power-constrained sensor nodes.

For engineers reviewing the FM24CL64B-DGTR datasheet, FM24CL64B-DGTR pinout, FM24CL64B-DGTR application, or FM24CL64B-DGTR equivalent, key selection criteria include write-cycle latency, I²C timing compatibility with legacy EEPROM systems, VDD operating margin, WP pin behavior under brown-out conditions, and SOIC/DFN package thermal performance in high-density PCB layouts.

Technical Context

The FM24CL64B-DGTR implements a true byte-addressable, nonvolatile memory array using ferroelectric capacitor technology - eliminating charge-pump-based write algorithms and enabling immediate byte-level writes without polling. Its I²C interface fully complies with standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) timing specifications.

Internal address latching supports sequential and random access modes; the 13-bit address space (0x0000–0x1FFF) is decoded via external A2–A0 pins and embedded slave ID (0xA0–0xA7). Write protection is hardware-controlled via the WP pin, which defaults to active-low logic and disables all writes when pulled high.

Key Specifications

Pinout & Package

FM24CL64B-DGTR is available in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) and an 8-pin DFN package (2 mm × 3 mm, 0.5 mm pitch) with exposed pad (non-connected). Both packages support standard reflow profiles and are RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial nonvolatile memory applications.

Compared with AT24C64D-SSHM-T, FM24CL64B-DGTR eliminates write latency and extends endurance by 100 million×; versus MB85RC64, it offers tighter VDD tolerance (2.7–3.65 V vs. 1.8–3.6 V) and guaranteed industrial-temp I²C timing at 1 MHz.

Availability

FM24CL64B-DGTR is available at Aetrix Electronics and suitable for industrial data loggers, smart meter firmware storage, and PLC I/O module configuration requiring stable component supply across multi-year production programs.

Supply support for FM24CL64B-DGTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability nonvolatile memory and programmable system-on-chip solutions for industrial, automotive, and IoT applications.

The FM24CL64B belongs to Cypress's F-RAM product line - engineered specifically to replace EEPROM in applications demanding rapid, reliable, low-power nonvolatile writes without firmware overhead.

FAQ

Is FM24CL64B-DGTR pin-compatible with standard 8-pin SOIC EEPROMs like AT24C64?

Yes - FM24CL64B-DGTR uses identical 8-pin SOIC and DFN footprints and matches the I²C pin assignments (VDD, VSS, SDA, SCL, WP, A0–A2) of AT24C64-series EEPROMs. No PCB redesign is needed for drop-in replacement, though WP pin behavior differs (active-high vs. active-low in some EEPROM variants) and must be verified in schematic.

Does FM24CL64B-DGTR require external circuitry beyond standard I²C pull-ups?

No - only standard I²C bus pull-up resistors on SDA and SCL are required. The device includes internal pull-downs on A0–A2 and WP, eliminating need for external biasing. A 100 nF ceramic decoupling capacitor between VDD and VSS within 5 mm of the package is mandatory for stable 1-MHz operation.

How does the WP pin behave during power-up and brown-out conditions?

WP is internally pulled down, so memory is write-enabled by default at power-on reset. If WP is externally tied to VDD, writes remain disabled until VDD stabilizes above 2.7 V. During brown-out, WP retains its logic state as long as VDD stays above 1.0 V - preventing partial writes during unstable supply transitions.

Can FM24CL64B-DGTR operate reliably at 1 MHz across the full industrial temperature range?

Yes - Cypress specifies full 1-MHz I²C operation from –40 °C to +85 °C, including setup/hold times, rise/fall times, and pulse widths. This is validated per JEDEC JESD78 and confirmed in AC switching characteristics tables (pages 11–12 of Rev. *K datasheet), with margins exceeding minimum I²C fast-mode plus requirements.