The **M93C76-RMB3TG** is a high-performance, low-voltage Serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is widely used for non-volatile data storage in automotive and industrial applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (8,192 bits) | | **Organization** | 512 x 16-bit or 1024 x 8-bit (Selectable via ORG pin) | | **Interface** | Microwire (Serial 3-wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Electronic Architecture & Components The device consists of several critical internal blocks that manage data integrity and communication: * **Memory Array:** The core 8Kb CMOS floating-gate cells where data is physically stored. * **Instruction Register & Decoder:** Interprets the op-codes sent by the microcontroller (READ, WRITE, ERASE, etc.). * **Address Decoder:** Selects the specific 8-bit or 16-bit word location within the memory matrix. * **Voltage Multiplier (Charge Pump):** An internal circuit that generates the high voltage required for erasing and programming the memory cells from the low-voltage supply. * **Ready/Busy Status Logic:** Provides feedback to the host controller during write cycles. --- ### 3. Pin Configuration (UFDFPN8) | Pin | Name | Description | | :--- | :--- | :--- | | 1 | **S** | Chip Select (Active High) | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (High: x16, Low: x8) | | 7 | **DU** | Don't Use (Must be connected to Vss or left floating) | | 8 | **Vcc** | Supply Voltage | --- ### 4. Part Number Breakdown: M93C76-RMB3TG * **M93**: STMicroelectronics Microwire family. * **C76**: 8 Kbit density. * **-R**: Range of supply voltage (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (2x3 mm). * **3**: Temperature range (-40°C to +125°C), typical for automotive Grade 3. * **TG**: Tape & Reel packing with "Green" (RoHS compliant) materials. --- ### 5. Notable Features * **Write Protection:** Data can be protected against accidental writes via the "Write Disable" instruction. * **Self-Timed Write Cycle:** The chip handles the timing of the erase/write process internally (typically 5ms). * **High Endurance:** Supports over 1 million write cycles. * **Data Retention:** Guaranteed for more than 40 years.