The **M24C32-RBN3** is a specific variant of the 32-Kbit serial I2C Bus EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of this component: | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4096 x 8 bits) | | **Interface** | I2C (Two-wire serial interface) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (at 1.8V - 5.5V) | | **Package Type** | DIP8 (Dual In-line Package) | | **Operating Temp Range** | -40°C to +125°C | | **Write Cycles** | 1 Million cycles (Endurance) | | **Data Retention** | 40 Years | --- ### 2. Part Number Breakdown (M24C32-RBN3) To understand the specific properties of this part, we can decode the suffix: * **M24**: Standard I2C family. * **C32**: 32 Kbit density. * **-R**: $V_{CC}$ range of 1.8V to 5.5V. * **BN**: PDIP8 package (Plastic Dual In-line Package). * **3**: Device grade 3 (High temperature range: -40°C to +125°C). --- ### 3. Pin Configuration (DIP8) | Pin Number | Name | Description | | :--- | :--- | :--- | | 1, 2, 3 | E0, E1, E2 | Chip Enable (Address inputs for multi-device bus) | | 4 | $V_{SS}$ | Ground | | 5 | SDA | Serial Data (Input/Output) | | 6 | SCL | Serial Clock (Input) | | 7 | WC | Write Control (Hardware protection) | | 8 | $V_{CC}$ | Supply Voltage | --- ### 4. Core Features & Functional Details #### I2C Communication The device operates as a slave on the I2C bus. It requires a start condition, an 8-bit device select code (usually `1010xxx`), and a 16-bit memory address (though only 12 bits are used for the 32Kb range). #### Write Protection (WC Pin) The **WC** (Write Control) pin provides hardware data protection: * If connected to $V_{SS}$ (Ground), the entire memory is writable. * If connected to $V_{CC}$, the memory is write-protected (read-only mode). #### Page Write Mode The device supports a **32-byte page write**. This allows you to write up to 32 bytes of data in a single write cycle, significantly improving programming speed compared to byte-by-byte writing. --- ### 5. Common Applications * **Configuration Storage:** Storing calibration data or user settings in industrial equipment. * **Identification:** Storing serial numbers or MAC addresses. * **Legacy Systems:** Because it uses the DIP8 package, it is often found in older hardware, prototyping boards, or industrial controllers where through-hole mounting is preferred for durability.