The **M95640-RMB3TG/P** is a high-performance, industrial-grade Serial Peripheral Interface (SPI) EEPROM manufactured by STMicroelectronics. It is part of the M95 series, commonly used for non-volatile data storage in automotive and industrial applications. --- ### ## Technical Specifications Below is a summary of the core electrical and physical parameters: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | SPI (Serial Peripheral Interface) | | **Max Clock Frequency** | 20 MHz (at VCC > 4.5V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Write Cycle Time** | 5 ms (Maximum) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ### ## Pin Configuration The device typically utilizes an 8-pin layout. The UFDFPN8 package follows the standard SPI pinout: 1. **S# (Chip Select):** Activates the device for communication. 2. **Q (Serial Data Output):** Data is shifted out on the falling edge of the clock. 3. **W# (Write Protect):** Hardware protection against unauthorized write operations. 4. **VSS:** Ground. 5. **D (Serial Data Input):** Data, opcodes, and addresses are shifted in. 6. **C (Serial Clock):** Synchronizes data movement. 7. **HOLD#:** Pauses serial communication without deselecting the device. 8. **VCC:** Supply voltage. --- ### ## Key Features * **Page Write Mode:** Allows writing up to 32 bytes in a single instruction cycle, significantly improving throughput for large data sets. * **Enhanced Reliability:** The "R" in the part number indicates high reliability, and the "3" grade typically signifies an automotive or extended industrial temperature range (up to 125°C). * **Low Power Consumption:** Features a standby current as low as 2 µA (at 1.8V), making it ideal for battery-powered devices. * **Block Protection:** Software-write protection allows the user to lock quarters, halves, or the entire memory array via the Status Register. --- ### ## Part Number Breakdown The suffix **RMB3TG/P** provides specific ordering information: * **R:** 1.8V to 5.5V operating voltage range. * **MB:** UFDFPN8 (2x3 mm) package. * **3:** Device tested for Temperature Grade 3 (-40 to +125 °C). * **TG:** Tape and Reel packaging. * **P:** Lead-free and RoHS compliant (Green). ---