The **M93C86-RMB3P** is a high-performance, low-voltage serial EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is widely used for non-volatile data storage in consumer electronics and industrial applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2,048 x 8 bits or 1,024 x 16 bits) | | **Interface** | MICROWIRE (Serial 3-Wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 5V), 1 MHz (@ 1.8V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +125°C (Grade 3) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### 2. Functional Description The M93C86-RMB3P acts as a secondary storage device for microcontrollers. Unlike RAM, it retains its data even when power is removed. * **Organization:** The device is "user-configurable." By setting the **ORG** pin, the user can choose whether the memory is accessed as 8-bit bytes or 16-bit words. * **Sequential Read:** It supports sequential reading, allowing the controller to pull large blocks of data without sending a new address for every byte. * **Write Protection:** It includes a "Write Enable" and "Write Disable" instruction set to prevent accidental data corruption during power-up or power-down cycles. --- ### 3. Pinout Configuration (UFDFPN8) | Pin Name | Function | Description | | :--- | :--- | :--- | | **S** | Chip Select | Activates the device when set high. | | **D** | Serial Data Input | Receives instructions and data. | | **Q** | Serial Data Output | Outputs data or "Ready/Busy" status. | | **C** | Serial Clock | Synchronizes data transfer. | | **ORG** | Organization Select | High = x16 organization; Low/Floating = x8 organization. | | **Vcc / Vss** | Power / Ground | Power supply and reference ground. | --- ### 4. Typical Applications * **Automotive:** Storing calibration data or odometer settings (due to high temperature rating). * **Consumer Electronics:** Storing user preferences in TVs or smart appliances. * **Industrial:** Configuration parameters for sensors and motor controllers. ---