The **M34C02-W-RMB6TG** is a specialized Serial I²C Bus EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is primarily designed for use in DRAM memory modules to store SPD (Serial Presence Detect) data. --- ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 2 Kbit (256 bytes) | | **Interface** | I²C Serial (2-wire) | | **Clock Frequency** | 400 kHz (Fast Mode) | | **Voltage Range (Vcc)** | 2.5V to 5.5V | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temp** | -40°C to +85°C | | **Endurance** | 1 Million Write Cycles | | **Data Retention** | 40 Years | --- ## Key Features ### 1. Write Protection Mechanism Unlike standard EEPROMs, the M34C02 series features advanced write protection: * **Permanent Write Protection:** The first 128 bytes (00h to 7Fh) can be permanently locked via a specific software sequence. This prevents accidental overwriting of critical SPD data. * **Software Write Protection:** Allows the device to be placed in a "Read-Only" mode using reversible commands. ### 2. Physical Design (UFDFPN8) The **RMB6TG** suffix indicates the package type. It is a very small, leadless 2x3mm package designed for space-constrained PCB environments like laptop SO-DIMM sticks. ### 3. I²C Protocol Support * **Device Slave Address:** The device uses a 4-bit fixed code (`1010`) followed by 3 hardware-selectable address pins (E0, E1, E2). * **Byte and Page Write:** Supports 16-byte page write operations for faster data programming. --- ## Typical Application Circuit In a memory module application, the M34C02 is connected as follows: ```text VCC (2.5V - 5.5V) | [Pull-up Resistors] | | SDA ----o------|---- (Serial Data) SCL -----------o---- (Serial Clock) | [M34C02] / | \ \ E0 E1 E2 WP | | | | GND/VCC (Write Protect Pin) ``` --- ## Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **M34** | Application Specific Memory (SPD) | | **C02** | 2 Kbit Capacity | | **-W** | 2.5V to 5.5V Supply Voltage | | **RMB** | UFDFPN8 Package (2x3mm) | | **6** | Industrial Temperature Range (-40 to 85°C) | | **TG** | Tape & Reel Packaging |