Infineon Technologies FM24C64B-G

Overview

FM24C64B-G from Cypress Semiconductor is a 64-Kbit (8K × 8) serial I²C F-RAM nonvolatile memory with NoDelay™ writes, 100 trillion (10¹⁴) read/write endurance, and 151-year data retention at industrial temperature (–40 °C to +85 °C). It operates from 4.5 V to 5.5 V and supports up to 1-MHz I²C bus speed - enabling real-time logging in power-loss-prone industrial controllers.

For engineers reviewing the FM24C64B-G datasheet, FM24C64B-G pinout, FM24C64B-G application, or FM24C64B-G equivalent, key selection criteria include write-cycle latency, I²C timing compatibility with legacy EEPROM systems, endurance under frequent timestamped writes, and hardware-level drop-in replacement feasibility without firmware changes.

Technical Context

The FM24C64B-G implements a ferroelectric memory array organized as 8,192 × 8 bits, accessed via standard two-wire I²C protocol with slave address 0xA0–0xA7 (R/W bit dependent). It requires no internal charge pump, eliminating write delay and reducing active current to 100 µA (typ) at 100 kHz.

Its control logic handles START/STOP conditions, 9-bit acknowledge cycles, and automatic address incrementing across sequential reads/writes. The WP pin enables hardware write protection for the full memory map, and A0–A2 pins configure one of eight device addresses on a shared I²C bus.

Key Specifications

Pinout & Package

FM24C64B-G is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with gull-wing leads, RoHS-compliant, and pin-compatible with industry-standard I²C EEPROMs such as AT24C64.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D and MB85RC64, FM24C64B-G uniquely delivers 5 V operation, integrated WP pin, and guaranteed 10¹⁴ endurance - making it the only option that satisfies both legacy 5 V hardware compatibility and mission-critical write-intensive use cases.

Availability

FM24C64B-G is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, PLC configuration storage, and medical event recorders requiring stable component supply across multi-year production lifecycles.

Supply support for FM24C64B-G 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) is a U.S.-based semiconductor company specializing in high-reliability memory, PSoC, and connectivity solutions for industrial and automotive markets.

The FM24C64B-G belongs to Cypress's F-RAM product line, engineered specifically to replace serial EEPROM in applications demanding rapid, unlimited, low-power nonvolatile writes without firmware redesign.

FAQ

Is FM24C64B-G pin-compatible with standard I²C EEPROMs like AT24C64?

Yes - FM24C64B-G uses an identical 8-pin SOIC footprint and I²C slave addressing scheme (0xA0–0xA7), with matching SDA, SCL, WP, VDD, VSS, and A0–A2 pin functions. No PCB layout changes are needed for drop-in replacement in existing 5 V systems.

Does FM24C64B-G require special I²C timing or firmware modifications?

No - it supports standard I²C START/STOP, ACK/NACK, and addressing protocols at 100 kHz, 400 kHz, and 1 MHz. Firmware retains full EEPROM driver compatibility; only write-polling loops should be removed due to NoDelay™ operation.

What is the maximum write speed achievable with FM24C64B-G?

At 1 MHz I²C clock, FM24C64B-G achieves sustained write throughput of ~100 KB/s (8-bit data), limited only by bus arbitration and master controller capability - not by internal memory latency, since writes complete within one I²C byte transfer cycle.

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

The WP pin is internally pulled down, so it defaults to write-enabled at power-on reset. To ensure safe default behavior, tie WP externally to VDD if write protection is required immediately after power application - this avoids transient unprotected windows during supply ramp.