The **M93C86-RMB6G/S** is a specific variant of a 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. Technical Specifications The part number can be broken down to understand its core electronic capabilities: | Feature | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | Microwire (3-wire serial) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V) / 1 MHz (at 1.8V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +85°C (Industrial Grade) | | **Endurance** | 4 Million write cycles | | **Data Retention** | 200 Years | --- ## 2. Pin Configuration (UFDFPN8) The device uses a compact 8-pin layout. The pins are functional as follows: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S (CS)** | Chip Select (Active High) | | 2 | **C (SK)** | Serial Clock | | 3 | **D (DI)** | Serial Data Input | | 4 | **Q (DO)** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (x8 or x16 mode) | | 7 | **DU/NC** | Don't Use / No Connect | | 8 | **Vcc** | Supply Voltage | --- ## 3. Key Electronic Features ### A. Organization Select (ORG Pin) One of the unique electronic aspects of this chip is the **ORG** pin. * If connected to **Vcc**, the memory is organized as **1024 x 16 bits**. * If connected to **Vss** (or left floating), the memory is organized as **2048 x 8 bits**. ### B. Write Protection The device includes a software-controlled write protection mechanism. Before any "Write" or "Erase" instruction can be executed, a specific **Write Enable (WEN)** instruction must be sent to prevent accidental data corruption during power-up or power-down sequences. ### C. Sequential Read After a read command is initiated, the device can output the entire memory contents sequentially by continuing to provide clock pulses, eliminating the need to send new addresses for each word. --- ## 4. Part Number Decoding (M93C86-RMB6G/S) * **M93C**: Microwire family. * **86**: 16 Kbit density. * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: UFDFPN8 package (2x3 mm). * **6**: Temperature range (-40 to +85 °C). * **G**: RoHS compliant / Halogen-free. * **/S**: Specific STMicroelectronics internal manufacturing process/flow marker.