## Technical Overview: M34C02-RMB6TG The **M34C02-RMB6TG** is a specific type of EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is primarily designed for use in DRAM memory modules (SPD - Serial Presence Detect) to store configuration data. --- ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Memory Size** | 2 Kbit (256 bytes) | | **Interface** | I²C (Inter-Integrated Circuit) | | **Clock Frequency** | 400 kHz (Fast Mode) | | **Supply Voltage (Vcc)** | 1.7V to 3.6V (Low voltage operation) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Write Protection** | Software-selectable write protection for the lower 128 bytes | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | --- ### 2. Electronic Architecture The device consists of several critical internal blocks: * **Memory Array:** Organized as 256 words of 8 bits each (2 Kbits total). * **Control Logic:** Handles the I²C protocol, including Start/Stop conditions and Acknowledge bits. * **Write Protection Logic:** A unique feature allowing the first half of the memory to be permanently or semi-permanently locked to prevent accidental overwriting of SPD data. * **Charge Pump:** Generates the high voltage required internally for erasing and programming the EEPROM cells from the low-voltage supply. --- ### 3. Pin Configuration (UFDFPN8) | Pin | Name | Type | Function | | :--- | :--- | :--- | :--- | | 1-3 | E0, E1, E2 | Input | Chip Enable (Address inputs for bus expansion) | | 4 | Vss | Ground | 0V Power supply | | 5 | SDA | I/O | Serial Data (Open-drain) | | 6 | SCL | Input | Serial Clock | | 7 | WC | Input | Write Control (Hardware protection) | | 8 | Vcc | Power | Supply Voltage | --- ### 4. Common Applications Due to its small footprint and specific write-protection features, it is standard in: 1. **DDR2/DDR3/DDR4 SDRAM Modules:** Storing module speed, density, and timing parameters. 2. **Mobile Devices:** Where board space is limited and low power consumption is critical. 3. **Consumer Electronics:** Storing small amounts of calibration or identification data. --- ### 5. Part Number Breakdown: M34C02-RMB6TG * **M34:** STMicroelectronics Application Specific Family (SPD). * **C02:** 2 Kbit density. * **-R:** 1.7V to 3.6V operating voltage. * **MB:** UFDFPN8 package (2x3 mm). * **6:** Industrial temperature range (-40 to 85 °C). * **T:** Tape and Reel packaging. * **G:** ECOPACK2 (RoHS compliant/Lead-free).