The **M95128-RMB3G/PC** is a high-performance, industrial-grade Serial Peripheral Interface (SPI) Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by STMicroelectronics. --- ### ## Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 128 Kbit (16,384 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **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 | --- ### ## Key Electronic Features 1. **SPI Modes**: Supports SPI Bus Modes 0 and 3, allowing for high-speed data synchronous transfers. 2. **Byte and Page Write**: It allows for single-byte writing or Page Write operations up to 64 bytes. The self-timed write cycle typically completes in 5ms. 3. **Hardware Protection**: * **Write Protect (W#) pin**: Used to freeze the status register to prevent accidental overwrites. * **Hold (HOLD#) pin**: Allows pausing communication without deselecting the device. 4. **Block Protection**: Software-based write protection allows the user to lock a quarter, half, or the entire memory array. 5. **Low Power Consumption**: Designed for battery-operated devices, with a deep power-down mode and very low standby current. --- ### ## Part Number Breakdown The suffix **RMB3G/PC** provides specific details regarding packaging and standards: * **M95128**: Base part series (128 Kbit SPI EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **MB**: Package code for **UFDFPN8** (2x3 mm). * **3**: Temperature Range (-40°C to +125°C). * **G**: ECOPACK2 (RoHS compliant and Halogen-free). * **PC**: Process technology or specific manufacturing site designation (often relates to "Automotive Grade" or specialized testing). --- ### ## Typical Application Circuits The device typically connects to a Microcontroller (MCU) using four signal lines: * **S (Chip Select)**: Activates the device. * **D (Serial Data Input)**: Receives instructions and data. * **Q (Serial Data Output)**: Sends data out to the MCU. * **C (Serial Clock)**: Synchronizes data movement.