The **M95640-RMB3TP/B** is a specific variant of the M95640 family, which is a high-performance, electrically erasable programmable memory (EEPROM). It is commonly used in automotive and industrial applications where data retention and high-speed communication are critical. --- ### 1. General Specifications The device is a 64-Kbit Serial SPI EEPROM organized as 8192 bytes (8 KB). | Feature | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage** | 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) | --- ### 2. Detailed Pinout and Functionality The M95640 uses a standard SPI pin configuration to communicate with a microcontroller (MCU). | Pin Name | Description | Function | | :--- | :--- | :--- | | **S (CS)** | Chip Select | Activates the device when pulled low. | | **D (MOSI)** | Serial Data Input | Receives instructions, addresses, and data. | | **Q (MISO)** | Serial Data Output | Sends data out to the MCU. | | **C (SCK)** | Serial Clock | Synchronizes data movement. | | **W (WP)** | Write Control | Provides hardware write protection. | | **HOLD** | Hold | Pauses communication without resetting the CS. | | **Vcc / Vss** | Power Supply | Power (1.8V - 5.5V) and Ground. | --- ### 3. Key Electronic Characteristics * **Endurance:** Designed for high reliability, typically supporting **4 million write cycles**. * **Data Retention:** Capable of holding data for over **200 years** at room temperature. * **Write Protection:** * **Software:** Write Enable Latch (WEL) bit and Block Protect bits (BP0, BP1). * **Hardware:** Via the Write Protect ($\bar{W}$) pin. * **Page Write:** Supports writing up to **32 bytes** in a single instruction cycle, significantly improving throughput compared to byte-by-byte writing. * **Low Power Consumption:** * Active Read: < 2 mA (at 20 MHz). * Standby Mode: < 1 µA (at 1.8V). --- ### 4. Part Number Breakdown (M95640-RMB3TP/B) | Code Segment | Meaning | | :--- | :--- | | **M95** | SPI Family EEPROM | | **640** | 64 Kbit Density | | **-R** | Low Voltage Range (1.8V to 5.5V) | | **MB** | Package: UFDFPN8 (2x3 mm) | | **3** | Temperature Grade: -40 to +125 °C (Automotive/High Industrial) | | **TP** | Tape & Reel Packaging | | **/B** | Specific process technology/wafer revision | ---