The **M95320-RMB3** is a specific variant of a Serial Peripheral Interface (SPI) EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. Below is a detailed breakdown of its electronic characteristics and technical specifications. --- ## 1. Core Specifications The alphanumeric suffix `RMB3` provides specific details regarding voltage, package type, and temperature range. | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) / 5 MHz (at 1.8V) | | **Operating Voltage** | 1.8V to 5.5V (The "R" in the part number) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3 or Industrial) | --- ## 2. Key Electronic Features ### Memory Architecture * **Organization:** The memory is organized as 4,096 words of 8 bits each. * **Page Size:** It features a **32-byte page write buffer**, allowing up to 32 bytes to be written in a single instruction cycle. ### Data Retention and Reliability * **Endurance:** Guaranteed 4 million write cycles (per byte). * **Data Retention:** More than 200 years. * **ESD Protection:** High Electrostatic Discharge (ESD) protection (typically > 4000V Human Body Model). ### Instruction Set The device operates using standard SPI opcodes: 1. **WREN/WRDI:** Write Enable/Disable. 2. **READ:** Read data from memory. 3. **WRITE:** Write data to memory. 4. **RDSR/WRSR:** Read/Write Status Register (used to check if the device is busy or to set write protection). --- ## 3. Pin Configuration (UFDFPN8) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **S#** | Chip Select (Active Low) | | 2 | **Q** | Serial Data Output (MISO) | | 3 | **W#** | Write Control / Hardware Protection | | 4 | **Vss** | Ground | | 5 | **D** | Serial Data Input (MOSI) | | 6 | **C** | Serial Clock | | 7 | **HOLD#** | Pause Serial Communication | | 8 | **Vcc** | Supply Voltage | --- ## 4. Part Number Breakdown: `M95320-RMB3` To understand the specific ordering code: * **M95:** SPI Family. * **320:** 32 Kbit density. * **-R:** Operating voltage range of 1.8V to 5.5V. * **MB:** Package code for UFDFPN8 (2x3 mm). * **3:** Device grade (Temperature range -40 to +125 °C). ---