STMicroelectronics M24C64X-FCU6T/TF

Overview

M24C64X-FCU6T/TF from STMicroelectronics is a 64-Kbit I²C-compatible serial EEPROM organized as 8 K × 8 bits, delivered in a 4-ball WLCSP package. It operates from 1.7 V to 5.5 V over –40 °C to +85 °C, supports 1 MHz I²C transfer, features configurable device address (CDA) via non-volatile register, and provides software write protection for full memory array - used in space-constrained embedded systems requiring reliable nonvolatile storage for calibration data or firmware configuration.

For engineers reviewing the M24C64X-FCU6T/TF datasheet, M24C64X-FCU6T/TF pinout, M24C64X-FCU6T/TF application, or M24C64X-FCU6T/TF equivalent, key selection criteria include its 4-ball WLCSP footprint, 32-byte page size, 5 ms write cycle time, SWP bit-controlled read-only mode, and C2/C1/C0-configurable I²C slave address - all critical for low-power, high-density PCB designs with multi-device I²C buses.

Technical Context

The M24C64X-FCU6T/TF implements a standard I²C slave interface with hardware-level compatibility for 400 kHz and high-speed 1 MHz modes. Its internal architecture includes an HV generator and sequencer for EEPROM cell programming, ECC logic for data integrity, and a dedicated chip enable register mapped at A15=1 (don't-care A14–A0) for configuring both CDA and SWP.

It uses open-drain SDA with external pull-up, requires stable VCC ≥1.7 V before instruction execution, and incorporates a power-on-reset circuit that prevents spurious writes during voltage ramp-up. The device enters Standby Power mode after Stop condition and remains unresponsive during internal write cycles (t_W ≤ 5 ms), enforcing strict bus timing compliance.

Key Specifications

Pinout & Package

Delivered in a 4-ball Wafer-Level Chip Scale Package (WLCSP), footprint optimized for ultra-compact PCB layouts. Bump layout is fixed: top-view marking side shows VCC–SCL–VSS–SDA in A1–A2–B1–B2 positions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and BR24G64FJ-WE2, the M24C64X-FCU6T/TF uniquely combines ultra-small WLCSP, software-configurable I²C addressing, and bit-level write lock - making it optimal for next-gen miniaturized systems where pin count, bus scalability, and firmware-controlled security are co-prioritized.

Availability

M24C64X-FCU6T/TF is available at Aetrix Electronics and suitable for smart wearable calibration, industrial PLC configuration storage, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for M24C64X-FCU6T/TF 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24C64X series belongs to ST's serial EEPROM product line, engineered specifically for space-constrained, low-power embedded systems needing robust, software-configurable nonvolatile storage with industrial temperature operation and high endurance.

FAQ

What is the function of the chip enable register in the M24C64X-FCU6T/TF?

The chip enable register is an 8-bit nonvolatile register accessible at memory address A15=1. Bits C2–C0 define the device's I²C slave address (000b–111b), enabling up to eight devices on one bus without hardware jumpers. Bit b0 controls software write protection: when set to 1, the entire memory array becomes read-only. Both fields retain values across power cycles.

How does the M24C64X-FCU6T/TF handle I²C address conflicts in multi-device systems?

It avoids conflicts via its configurable device address (CDA) feature: users program C2/C1/C0 bits in the chip enable register to assign one of eight unique 3-bit chip enable codes (000b–111b), which combine with the fixed 1010b device type identifier to form a full 7-bit slave address. This eliminates manual address hardwiring and enables dynamic assignment in firmware.

Can the M24C64X-FCU6T/TF operate at 1.6 V, and under what conditions?

Yes - it supports 1.6 V minimum VCC, but only over 0 °C to +85 °C ambient temperature (not –40 °C). At 1.6 V, AC timing parameters such as t_BUF and t_HD:STA are relaxed per DS12107 Rev 8 Section 9, and operation is restricted to standard-mode (400 kHz) I²C - high-speed 1 MHz mode is not guaranteed below 1.7 V.

What happens during a page write that crosses a 32-byte boundary?

When a page write exceeds the current 32-byte page boundary, the device performs automatic rollover: remaining bytes wrap around and overwrite the beginning of the same page (address 0x0000 within that page), rather than advancing to the next page. This behavior is deterministic and documented in Section 6.1.2 of the datasheet - no error or NACK occurs, but application firmware must manage address alignment to avoid unintended overwrites.