The **M93C56-RMB6** is a specific variant of a serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory). It is widely used in automotive, industrial, and consumer electronics for storing small amounts of configuration data, calibration parameters, or device IDs. --- ## 1. Core Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 2 Kbit (256 x 8 bits or 128 x 16 bits) | | **Interface** | Microwire (3-wire serial) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 5V) | | **Package Type** | UFDFPN8 (MLP8) - 2x3 mm | | **Operating Temperature** | -40°C to +85°C | | **Write Cycles** | 1,000,000+ endurance cycles | | **Data Retention** | 40 Years | --- ## 2. Key Features and Functionality ### Organization (x8 vs x16) The "56" in the part number indicates a 2 Kbit density. A unique feature of this series is the **ORG (Organization)** pin or internal configuration, which allows the memory to be accessed as either: * **256 words of 8 bits** each. * **128 words of 16 bits** each. ### Low Power Operation The **"-R"** suffix in the part number signifies a low-voltage operation range (1.8V to 5.5V), making it ideal for battery-powered handheld devices or modern low-voltage microcontrollers. ### Package: RMB6 The **"RMB6"** suffix specifically identifies the physical package and temperature range: * **RMB:** Refers to the **UFDFPN8** (also known as MLP8). It is a very small, leadless surface-mount package (2x3mm), saving significant PCB real estate. * **6:** Indicates the standard industrial temperature range (-40°C to +85°C). --- ## 3. Pinout Description | Pin Name | Function | Description | | :--- | :--- | :--- | | **S** | Chip Select | Activates the device when high. | | **D** | Serial Data Input | Receives instructions and data. | | **Q** | Serial Data Output | Transfers data out to the MCU. | | **C** | Serial Clock | Synchronizes the data transfer. | | **ORG** | Organization Select | Sets memory structure (High=x16, Low/NC=x8). | | **Vcc / Vss** | Power Supply | Positive supply and Ground. | --- ## 4. Common Applications * **Automotive:** Odometer data, airbag sensors, and radio presets. * **Industrial:** Calibration data for sensors and motor controllers. * **Consumer:** Storing Wi-Fi credentials or user settings in smart home devices.