The **M93C76-RMB6** is a specific variant of a serial Microwire EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. It is commonly used in automotive and industrial applications for storing small amounts of non-volatile data (like configuration settings or serial numbers). --- ## 1. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (8,192 bits) | | **Organization** | User-definable: 512 x 16-bit OR 1024 x 8-bit | | **Interface** | Microwire (3-wire serial interface) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 5V), 1 MHz (at 1.8V) | | **Write Cycles** | 4,000,000 (4 Million) cycles | | **Data Retention** | 200 Years | | **Temperature Range** | -40°C to +85°C (Industrial Grade) | --- ## 2. Deciphering the Part Number The suffix **RMB6** provides critical information about the physical and electrical characteristics of the chip: * **M93C76**: The base part family (8 Kbit Microwire EEPROM). * **-R**: Indicates the operating voltage range is **1.8V to 5.5V**. * **MB**: Specifies the package type, which is **UFDFPN8** (Ultra-thin Fine pitch Dual Flat No-lead, 2x3 mm). * **6**: Indicates the Temperature Range 6 (**-40°C to +85°C**). --- ## 3. Key Features ### User-Configurable Organization The chip features an **ORG** pin. Depending on how this pin is wired, the memory structure changes: * **ORG connected to $V_{CC}$:** Organized as 512 words of 16 bits each. * **ORG connected to $V_{SS}$ (Ground):** Organized as 1024 words of 8 bits each. ### Protection and Durability * **Write Protection:** The device includes a "Write Disable" state at power-up to prevent accidental data corruption. * **Ready/Busy Status:** During a write cycle, the data output (DO) pin can be polled to check if the internal write operation is complete. --- ## 4. Pin Configuration (UFDFPN8) | Pin Name | Function | | :--- | :--- | | **S (CS)** | Chip Select | | **D (DI)** | Serial Data Input | | **Q (DO)** | Serial Data Output | | **C (SK)** | Serial Clock | | **ORG** | Internal Organization (x8 or x16) | | **$V_{CC}$ / $V_{SS}$** | Power Supply / Ground | --- ## 5. Connection Example To interface this with a microcontroller (e.g., Arduino or STM32), the wiring usually follows this logic: ```cpp // Typical 3-wire Microwire logic CS -> Digital Pin (High to Select) SK -> SPI/Serial Clock DI -> MOSI (Master Out Slave In) DO -> MISO (Master In Slave Out) ORG -> VCC (For 16-bit mode) ```