## Electronic Specifications of the M93C66-RMB3G The **M93C66-RMB3G** is a low-voltage, serial EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. It is widely used for parameter storage in applications where low power consumption and small form factors are critical. --- ### 1. General Characteristics The device is organized at the hardware level as 4 Kbits (4096 bits). A key feature of this specific family is the selectable memory organization. | Feature | Specification | | :--- | :--- | | **Memory Size** | 4 Kbit | | **Organization** | 512 x 8 bits (Byte mode) or 256 x 16 bits (Word mode) | | **Interface** | Microwire (3-wire) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Voltage** | 1.8V to 5.5V | --- ### 2. Detailed Technical Specifications The "RMB3G" suffix provides specific details regarding its operating range and packaging: * **Operating Temperature:** -40°C to +125°C (Automotive Grade 3). * **Clock Frequency:** * 2 MHz at 4.5V < Vcc < 5.5V * 1 MHz at 1.8V < Vcc < 4.5V * **Write Cycles:** More than 4 million write cycles. * **Data Retention:** More than 200 years. * **Write Protection:** Software-controlled write protection for the entire memory. --- ### 3. Pinout Description (UFDFPN8) The device uses a standard serial interface pinout: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **S** | Chip Select | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (High = x16, Low = x8) | | 7 | **DU** | Don't Use / No Connect | | 8 | **Vcc** | Supply Voltage | --- ### 4. Part Number Breakdown Understanding the suffix **-RMB3G**: * **M93C66**: Base part number (4 Kbit Microwire EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code for UFDFPN8 (2x3 mm). * **3**: Temperature range (-40 to +125 °C). * **G**: Green/EcoPack2 (RoHS compliant). --- ### 5. Application Areas Due to its high reliability and small size, it is commonly found in: 1. **Automotive Modules:** Storing calibration data and sensor offsets. 2. **Consumer Electronics:** Storing user preferences and configuration settings. 3. **Industrial Controllers:** Error logging and parameter backup.