## Overview of M24C64-RMB3 The **M24C64-RMB3** is a 64-Kbit serial I²C (Inter-Integrated Circuit) EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. It is designed for low-power, non-volatile data storage applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Capacity** | 64 Kbits (8192 x 8 bits) | | **Interface** | I²C (2-wire serial bus) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) or 1 MHz (Fast Mode Plus) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Write Cycle Time** | 5 ms (Maximum) | | **Data Retention** | > 200 Years | | **Endurance** | 4 Million Write Cycles | --- ### 2. Pin Configuration (UFDFPN8) The "RMB" suffix indicates a specific physical footprint. Below are the typical pin assignments for this 8-pin package: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1, 2, 3 | E0, E1, E2 | **Chip Enable**: Used to set the device hardware address. | | 4 | VSS | **Ground**. | | 5 | SDA | **Serial Data**: Bi-directional pin for data transfer. | | 6 | SCL | **Serial Clock**: Input for clock signal. | | 7 | WC | **Write Control**: Hardware protection; if High, write operations are disabled. | | 8 | VCC | **Supply Voltage**. | --- ### 3. Key Electronic Features #### A. I²C Protocol Support The device acts as a **Slave** on the I²C bus. It supports: * **Byte Write**: Writing a single 8-bit byte. * **Page Write**: Writing up to 32 bytes in a single burst. * **Random/Sequential Read**: Flexible data retrieval methods. #### B. Write Protection (WC Pin) The hardware Write Control (WC) pin provides a layer of security. When connected to $V_{CC}$, the memory becomes read-only, preventing accidental data corruption or unauthorized updates. #### C. Low Power Consumption The "R" in the part number often signifies a specific voltage range or low-power optimization. It features: * **Active Current**: ~2 mA during write operations. * **Standby Current**: < 1 $\mu$A (typical) at 1.8V. --- ### 4. Part Number Breakdown The suffix **M24C64-RMB3** can be decoded as follows: * **M24**: I²C Interface family. * **C64**: 64 Kbit density. * **R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code (UFDFPN8). * **3**: Device Grade (typically indicates temperature range: -40°C to +125°C). ---