The **M93C76-RMB3** (often identified within the M93C46/56/66/76/86 family) is a high-reliability, low-voltage serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It is commonly used for parameter storage in automotive and industrial applications. --- ## 1. Core Technical Specifications The following table summarizes the primary electrical and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (8,192 bits) | | **Organization** | Configurable: 1024 x 8-bit or 512 x 16-bit | | **Interface** | MICROWIRE (3-wire serial interface) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 4.5V - 5.5V) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3) | --- ## 2. Key Features and Pinout The M93C76-RMB3 utilizes a standard serial interface protocol. Below is the functional description of the pins: ### Pin Functionality * **S (Chip Select):** Activates the device when held high. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Outputs data during read operations. * **C (Serial Clock):** Synchronizes the data transfer. * **ORG (Organization Select):** * Connected to $V_{CC}$: Organized as 16-bit words. * Connected to $V_{SS}$ (GND): Organized as 8-bit bytes. --- ## 3. Part Number Decoding (M93C76-RMB3TG) Understanding the suffix is critical for procurement and PCB design: | Suffix | Meaning | | :--- | :--- | | **M93C76** | Device Family and Density (8 Kbit) | | **-R** | Operating Voltage: 1.8V to 5.5V | | **MN** | Package Type (e.g., SO8) | | **B** | Process technology (Revision B) | | **3** | Temperature range: -40 to +125 °C | --- ## 4. Operational Logic The device supports several standard instructions through the MICROWIRE bus: 1. **READ:** Reads data from memory starting at a selected address. 2. **WEN (Write Enable):** Must be executed before any write or erase instruction to prevent accidental data corruption. 3. **WRITE:** Writes a byte or word to the memory. 4. **READY/BUSY:** During a write cycle, the Data Output (Q) pin can be polled to check if the internal write cycle is complete. --- ## 5. Typical Application Areas * **Automotive:** Storing odometer data, airbag sensors, and engine control calibrations. * **Industrial:** Storing MAC addresses for networking or calibration constants for sensors. * **Consumer:** Storing user preferences in appliances or smart devices.