The **M93C56-RMB3TG** is a specific variant of a serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory). It is widely used in automotive and industrial applications for non-volatile data storage. --- ### 1. Technical Specifications Below are the primary technical parameters for this specific part: | 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 (at 4.5V - 5.5V) | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 1) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Write Cycles** | 1 Million (Typical) | | **Data Retention** | 40 Years (Minimum) | --- ### 2. Part Number Breakdown The suffix **-RMB3TG** provides critical information about the packaging and environmental rating: * **M93C56**: Base part number (2 Kbit Microwire EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (MLP 2x3 mm). * **3**: Temperature range (-40°C to +125°C). * **TG**: Tape & Reel packaging with RoHS compliant/Green materials. --- ### 3. Key Electronic Features #### A. Memory Organization The chip is "user-configurable." Depending on the logic level applied to the **ORG** (Organization) pin, the memory can be accessed in two ways: * **x8 mode:** 256 words of 8 bits each. * **x16 mode:** 128 words of 16 bits each. #### B. The Microwire Interface Unlike I2C or SPI, the Microwire interface uses a simple 3-wire protocol: 1. **S (Chip Select):** Activates the device. 2. **C (Serial Clock):** Synchronizes data movement. 3. **D (Serial Data Input):** Receives instructions and data. 4. **Q (Serial Data Output):** Sends data back to the MCU. #### C. Write Protection The device includes a status register and specific instructions (`WEN` - Write Enable, `WDS` - Write Disable) to prevent accidental data erasure or overwriting due to noise or power fluctuations. --- ### 4. Typical Application Circuit In a standard electronic design, the M93C56 is wired as follows: ```c // Typical Pinout Mapping (UFDFPN8) 1: S (Chip Select) -----> To MCU GPIO 2: C (Serial Clock) -----> To MCU SCK 3: D (Data Input) -----> To MCU MOSI 4: Q (Data Output) -----> To MCU MISO 5: VSS (Ground) -----> 0V 6: ORG (Organization) -----> VCC (for x16) or GND (for x8) 7: DU (Don't Use) -----> No Connection 8: VCC (Supply) -----> 1.8V - 5.5V ```