## Technical Overview: M24C64-RBN3P The **M24C64-RBN3P** is a 64-Kbit (8,192 x 8-bit) serial I²C bus EEPROM manufactured by STMicroelectronics. It is widely used for non-volatile parameter storage in consumer electronics and industrial applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8 KB) | | **Interface** | I²C (2-wire serial) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) or 1 MHz (Fast Mode Plus) | | **Package Type** | PDIP8 (Plastic Dual In-line Package, 8 pins) | | **Operating Temperature** | -40°C to +85°C | | **Write Cycles** | More than 4 million cycles | | **Data Retention** | More than 200 years | --- ### 2. Pin Configuration (PDIP8) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1, 2, 3 | E0, E1, E2 | **Chip Enable Inputs:** Used to define the device's I²C address (allows up to 8 devices on the same bus). | | 4 | $V_{SS}$ | **Ground.** | | 5 | SDA | **Serial Data:** Bi-directional pin for shifting data in/out. | | 6 | SCL | **Serial Clock:** Provides the timing for data transfer. | | 7 | WC | **Write Control:** Hardware protection. If tied to $V_{CC}$, writes are disabled. If tied to $V_{SS}$, writes are enabled. | | 8 | $V_{CC}$ | **Power Supply.** | --- ### 3. Core Functional Features * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single write cycle. * **Self-timed Write Cycle:** The device handles the internal write timing automatically (typically 5ms). * **Enhanced Reliability:** Incorporates an internal hardware error correction code (ECC) to ensure data integrity. * **Low Power Consumption:** * Active Read Current: < 2 mA * Standby Current: < 1 µA (at 1.8V) --- ### 4. Part Number Breakdown: M24C64-RBN3P Understanding the suffix is critical for procurement and PCB design: * **M24**: I²C family of EEPROMs. * **C64**: 64 Kbit density. * **-R**: Operating voltage range (1.8V to 5.5V). * **BN**: PDIP8 package (0.25 inch width). * **3**: Temperature range 3 (-40 to +125°C) or specific process tech (Note: In this specific string, '3' usually refers to the high-reliability automotive or industrial grade). * **P**: Lead-free and RoHS compliant (ECOPACK2). --- ### 5. Application Example (Pseudocode) To write data to this EEPROM using an Arduino or similar microcontroller: ```cpp #include #define EEPROM_ADDR 0x50 // Base address for M24C64 void writeEEPROM(int address, byte val) { Wire.beginTransmission(EEPROM_ADDR); Wire.write((int)(address >> 8)); // MSB of memory address Wire.write((int)(address & 0xFF)); // LSB of memory address Wire.write(val); // Data to store Wire.endTransmission(); delay(5); // Wait for internal write cycle } ```