The **M93C86-RMB3TP/W** is a specific variant of a serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is commonly used for non-volatile data storage in automotive and industrial applications. --- ## 1. Technical Specifications The part number encodes specific characteristics regarding its capacity, voltage, and packaging. | Feature | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | Microwire (Serial 3-Wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 5V), 1 MHz (at 1.8V) | | **Package Type** | UFDFPN8 (MLP8) - 2x3 mm | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ## 2. Key Internal Components The electronic architecture of the M93C86-RMB3TP/W consists of several functional blocks: ### A. Memory Array The core consists of **16,384 bits** of non-volatile storage. The device features a user-selectable organization via the **ORG pin**: * **ORG High:** Organized as 1024 words of 16 bits. * **ORG Low/Floating:** Organized as 2048 words of 8 bits. ### B. Control Logic & Instruction Decoder This section handles the Microwire protocol. It interprets opcodes for: * `READ`: Read data from memory. * `WRITE`: Write data to memory. * `ERASE`: Erase a specific address or the entire chip. * `EWEN/EWDS`: Erase/Write Enable and Disable (security latch). ### C. Charge Pump Since the chip operates at low voltages (as low as 1.8V) but requires higher voltages to tunnel electrons into the floating-gate transistors, an **internal charge pump** generates the necessary programming voltage. --- ## 3. Pin Configuration (UFDFPN8) The device uses a compact 8-pin layout to minimize PCB footprint. | Pin | Name | Function | | :--- | :--- | :--- | | 1 | **S** | Chip Select | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (x8 or x16) | | 7 | **DU** | Don't Use (Must be connected to Vss or left floating) | | 8 | **Vcc** | Supply Voltage | --- ## 4. Part Number Breakdown The suffix **RMB3TP/W** provides critical logistics and manufacturing info: * **R**: 1.8V to 5.5V operating voltage. * **MB**: UFDFPN8 (2x3mm) package. * **3**: Range 3 temperature (-40 to +125 °C). * **TP**: Tape and Reel packaging. * **W**: High reliability/Automotive grade process. ---