## Overview of M95256-RMW3G The **M95256-RMW3G** is a high-performance, electrically erasable programmable memory (EEPROM) manufactured by STMicroelectronics. It is designed for applications requiring non-volatile storage with high endurance and data retention. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 256 Kbit (32,768 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) / 5 MHz (at 1.8V) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Package Type** | SO8N (150 mil width) | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3) | | **Endurance** | 4 Million write cycles | | **Data Retention** | 200 Years | --- ### 2. Functional Pins Description The device uses a standard 8-pin configuration common for SPI EEPROMs: * **S (Chip Select):** Activates the device when pulled low. * **D (Serial Data Input):** Used to transfer data into the device. * **Q (Serial Data Output):** Used to read data out of the device. * **C (Serial Clock):** Provides the timing for the serial interface. * **W (Write Protect):** Hardware protection to prevent write operations to the status register. * **HOLD (Hold):** Pauses communication without deselecting the device. * **Vcc/Vss:** Power supply and Ground. --- ### 3. Core Features * **Byte and Page Write:** Supports writing a single byte or a page of up to 64 bytes in a single instruction. * **Write Protection:** Includes flexible software protection (SRWD bit) and hardware protection (W pin) for specific memory blocks. * **Enhanced Reliability:** The "3G" suffix indicates a specific process technology and automotive-grade qualification, ensuring stability in harsh environments. * **Low Power Consumption:** Optimized for battery-powered applications with low standby and active currents. --- ### 4. Part Number Breakdown: M95256-RMW3G ```text M95 - Family (SPI EEPROM) 256 - Density (256 Kbit) -R - Operating Voltage (1.8V to 5.5V) MW - Package (SO8N, 150 mil width) 3 - Temperature Range (-40 to +125 °C) G - RoHS Compliant / Halogen Free ```