## M95640-RMC6TG: Technical Overview The **M95640-RMC6TG** is a high-performance, low-voltage Serial Peripheral Interface (SPI) Electrically Erasable Programmable Read-Only Memory (EEPROM) manufactured by **STMicroelectronics**. It is widely used for parameter storage in space-constrained applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8,192 x 8 bits) | | **Interface** | SPI (Mode 0 and Mode 3) | | **Max Clock Frequency** | 20 MHz (at 4.5V - 5.5V) / 5 MHz (at 1.8V) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | UFDFPN8 (MLP8) - Ultra-thin Fine Pitch Dual Flat No-lead | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### 2. Functional Electronic Features * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single write cycle. * **Write Protection:** * **Software Protection:** Via a Status Register that can lock specific blocks of memory (Quarter, Half, or Whole). * **Hardware Protection:** A dedicated `W` (Write Protect) pin to prevent unauthorized writes to the Status Register. * **Low Power Consumption:** * **Active Read current:** 2 mA * **Standby current:** 1 µA (Deep sleep mode) * **Clock Speed:** Capable of high-speed data transfer up to 20 MHz, making it suitable for fast boot-up sequences. --- ### 3. Pin Configuration (UFDFPN8) | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S#** | Chip Select (Active Low) | | 2 | **Q** | Serial Data Output (MISO) | | 3 | **W#** | Write Protect | | 4 | **Vss** | Ground | | 5 | **D** | Serial Data Input (MOSI) | | 6 | **C** | Serial Clock | | 7 | **HOLD#** | Hold (Suspends communication without deselecting) | | 8 | **Vcc** | Supply Voltage | --- ### 4. Part Number Breakdown: M95640-RMC6TG * **M95**: SPI Serial Access EEPROM. * **640**: 64 Kbit density. * **-R**: Range of supply voltage (1.8V to 5.5V). * **MC**: UFDFPN8 (MLP8) package. * **6**: Industrial temperature range (-40 to 85°C). * **TG**: Tape and Reel packaging (RoHS compliant). --- ### 5. Common Applications Due to its small footprint (UFDFPN8) and high endurance, this part is commonly found in: 1. **Mobile Devices:** Storing calibration data and user settings. 2. **Wearables:** Compact storage for fitness trackers and smartwatches. 3. **Industrial Modules:** Storing configuration parameters for sensors. 4. **Medical Equipment:** Reliable data logging for portable devices.