The **M93C86-RMB6TP/S** is a specific variant of a Serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is commonly used for storing small amounts of non-volatile data, such as configuration settings, device IDs, or calibration constants. --- ## 1. Technical Specifications Below are the primary electronic characteristics of this specific part number: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | MICROWIRE (Serial Peripheral Interface variant) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V); lower at 1.8V | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Data Retention** | > 40 Years | | **Write Cycles** | 1,000,000+ Cycles | --- ## 2. Part Number Breakdown The suffixing in the part number provides specific details about its physical and electrical implementation: * **M93C86**: The base model indicating a 16 Kbit Microwire EEPROM. * **-R**: Indicates a wide voltage range (1.8V to 5.5V). * **MB**: Represents the package type **UFDFPN8** (2x3 mm). * **6**: Temperature range grade 6 (-40 to +85°C). * **T**: Shipping method (Tape and Reel). * **P / S**: Processing/Finishing codes (typically Lead-free/RoHS compliant). --- ## 3. Key Electronic Features ### Organization (ORB Pin) The device is "user-configurable" regarding how the data is organized. * If the **ORG** pin is connected to $V_{CC}$, it is organized as **1024 x 16 bits**. * If the **ORG** pin is connected to $V_{SS}$ (Ground), it is organized as **2048 x 8 bits**. ### Write Protection The chip includes a software write-protection mechanism. The **Write Enable (WEN)** instruction must be sent before any data can be modified, preventing accidental data corruption during power-up or power-down cycles. ### Sequential Read Unlike older EEPROM models, this part supports sequential reading, allowing the controller to read the entire memory contents by continuing to provide clock pulses after the initial address is accessed. --- ## 4. Typical Application Circuit The M93C86 communicates via four main signals. ```cpp // Typical Pin Connection Map // 1. S: Chip Select (Active High) // 2. C: Serial Clock // 3. D: Serial Data Input // 4. Q: Serial Data Output // 5. VCC: Power Supply // 6. VSS: Ground // 7. ORG: Organization Select // 8. DU: Don't Use / NC ```