## M34D64-R Electronic Component Overview The **M34D64-R** is a specific type of Non-Volatile Memory (NVM) produced by STMicroelectronics. It belongs to the **EEPROM** (Electrically Erasable Programmable Read-Only Memory) family, specifically designed for applications requiring high endurance and data retention. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 64 Kbits (8,192 bytes x 8 bits) | | **Interface** | I²C (Inter-Integrated Circuit) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 400 kHz (Fast Mode) | | **Write Cycles** | Up to 1,000,000 (1 Million) | | **Data Retention** | 40 Years | | **Package Options** | SO8, TSSOP8, UFDFPN8 | --- ### 2. Functional Description The device is organized as a single block of memory. It communicates with a host controller (like a microcontroller) using a two-wire serial interface consisting of a Serial Data line (**SDA**) and a Serial Clock line (**SCL**). #### Core Internal Components: * **Memory Array:** A 64-Kbit matrix of floating-gate transistors. * **Control Logic:** Manages the protocol for I²C communication, including device addressing and acknowledgment. * **Write Latches:** Internal buffers that hold data before it is physically written to the non-volatile cells. * **Voltage Multiplier:** An internal charge pump that generates the high voltage required for erasing and programming the memory cells from a low-voltage supply. --- ### 3. Pin Configuration (Typical 8-Pin Package) | Pin Name | Function | Description | | :--- | :--- | :--- | | **E0, E1, E2** | Chip Enable | Used to define the device's I²C address (allows multiple chips on one bus). | | **SDA** | Serial Data | Bi-directional pin for transferring data and addresses. | | **SCL** | Serial Clock | Input pin for clocking data in and out. | | **WC** | Write Control | A hardware protection pin; when high, it prevents write operations. | | **Vcc** | Power Supply | 1.8V to 5.5V input. | | **Vss** | Ground | Reference voltage. | --- ### 4. Operational Features * **Byte Write & Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single write cycle. * **Low Power Consumption:** It features an active current of roughly 1mA and a standby current in the micro-amp range, making it ideal for battery-powered devices. * **Software Write Protection:** Allows portions of the memory to be locked against accidental overwrites via software commands. ---