The **M93C86-RMB7TG** is a high-reliability, low-voltage serial EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is commonly used in automotive and industrial applications for storing small amounts of configuration data that must persist after power is lost. --- ## 1. Technical Specifications Below is a breakdown of the key electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2,048 x 8-bit or 1,024 x 16-bit) | | **Interface** | MICROWIRE (Serial 3-Wire) | | **Voltage Range** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Write Cycles** | 4 million cycles (at 25°C) | | **Data Retention** | 200 years | | **Operating Temp** | -40°C to +105°C | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | --- ## 2. Key Internal Components & Features ### A. Memory Organization The chip features a flexible organization. Depending on the state of the **ORG** pin, the memory can be accessed as: * **8-bit bytes:** (2048 x 8) * **16-bit words:** (1024 x 16) ### B. Serial Interface (MICROWIRE) Unlike I2C or SPI, this uses the Microwire protocol, which consists of: * **S (Chip Select):** Enables the device. * **D (Serial Data Input):** Receives instructions and data. * **Q (Serial Data Output):** Sends data back to the microcontroller. * **C (Serial Clock):** Synchronizes data transfer. ### C. Write Protection The device includes a **Write Enable (WEN)** and **Write Disable (WDS)** instruction set. This prevents accidental data corruption due to noise or power fluctuations by locking the memory against write commands. --- ## 3. Part Number Breakdown (M93C86-RMB7TG) Understanding the suffix is critical for procurement and PCB design: * **M93C86:** Base Part Number (16 Kbit Microwire EEPROM). * **-R:** Operating Voltage (1.8V to 5.5V). * **MB:** Package Type (UFDFPN8 / DFN8). * **7:** Device Grade (Automotive/Industrial temp -40 to +105°C). * **T:** Packing (Tape & Reel). * **G:** RoHS compliant / Green (Halogen-free). --- ## 4. Typical Application Circuit When integrating this part into a circuit, standard electronic practices include: 1. **Decoupling Capacitor:** A 100nF ceramic capacitor placed as close as possible to the $V_{CC}$ and $V_{SS}$ pins to filter power supply noise. 2. **Pull-up/Pull-down Resistors:** Usually required on the Chip Select (S) line to ensure the device remains in a known "disabled" state during microcontroller power-up.