The **M95320-RMB3TG/S** is a specific variant of a serial SPI (Serial Peripheral Interface) EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. --- ### 1. Key Technical Specifications Below are the primary technical parameters for this electronic component: | Feature | Specification | | :--- | :--- | | **Memory Size** | 32 Kbit (4,096 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz (depending on voltage) | | **Operating Voltage** | 1.8V to 5.5V | | **Operating Temperature** | -40°C to +125°C (Automotive Grade) | | **Package Type** | UFDFPN8 (Ultra-thin Fine-pitch Dual Flat No-lead) | | **Write Cycles** | 4 million cycles (typical) | | **Data Retention** | 200 years | --- ### 2. Pinout Configuration The M95320 series typically uses an 8-pin layout. In the **UFDFPN8** package, the configuration is as follows: 1. **S# (Chip Select):** Activates the device for communication. 2. **Q (Serial Data Output):** Data shifts out on the falling edge of the clock. 3. **W# (Write Protect):** Hardware protection to prevent writing to the memory. 4. **VSS:** Ground. 5. **D (Serial Data Input):** Data shifts in on the rising edge of the clock. 6. **C (Serial Clock):** Provides the timing for data transfer. 7. **HOLD#:** Pauses serial communication without resetting the chip. 8. **VCC:** Supply voltage. --- ### 3. Functional Breakdown * **SPI Protocol:** It supports Mode 0 (0,0) and Mode 3 (1,1). It is designed to work at high speeds compared to I2C-based EEPROMs. * **Block Protection:** The device includes a Status Register that allows the user to software-protect quarter, half, or the entire memory array. * **Page Write:** It allows writing up to 32 bytes in a single instruction cycle, which significantly improves write throughput. * **Automotive Grade (/S Suffix):** The "/S" in the part number usually indicates a specific high-reliability or automotive-grade screening process, making it suitable for harsh environments like engine control units or sensory modules. --- ### 4. Part Number Breakdown * **M95:** SPI Family. * **320:** 32 Kbit density. * **R:** 1.8V to 5.5V range. * **MB:** UFDFPN8 (2x3 mm) package. * **3:** Range 3 temperature (-40 to +125 °C). * **TG:** Tape and Reel packing. * **/S:** Specific automotive or high-reliability process flow.