## Technical Overview: M95320-RBN6P The **M95320-RBN6P** is a specific variant of the 32-Kbit serial SPI (Serial Peripheral Interface) EEPROM manufactured by **STMicroelectronics**. It is designed for high-reliability applications requiring non-volatile memory in a small footprint. --- ### 1. Part Number Breakdown Understanding the suffix codes is crucial for identifying the specific characteristics of this component: | Code Segment | Meaning | | :--- | :--- | | **M95** | SPI Family Serial EEPROM | | **320** | 32 Kbit (4,096 bytes) capacity | | **-R** | Low voltage range (1.8V to 5.5V) | | **BN** | PDIP8 package (Plastic Dual-in-line) | | **6** | Industrial temperature range (-40°C to +85°C) | | **P** | RoHS compliant / Lead-free | --- ### 2. Key Specifications The electronic performance of the M95320-RBN6P is defined by its speed, power consumption, and data retention capabilities. * **Memory Size:** 32 Kbits (4096 x 8 bits). * **Interface:** SPI (Modes 0 and 3). * **Clock Frequency:** Up to 20 MHz (at 4.5V - 5.5V) or 5 MHz (at 1.8V). * **Write Cycle Time:** Maximum 5 ms per page. * **Page Size:** 32 bytes. * **Endurance:** More than 1,000,000 write cycles. * **Data Retention:** Over 40 years. --- ### 3. Pinout Configuration (PDIP8) The device uses a standard 8-pin layout for easy integration into breadboards or through-hole PCBs. | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 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#** | Pause Communication | | 8 | **Vcc** | Supply Voltage | --- ### 4. Core Features #### A. Write Protection The chip features a **Write Status Register** and a hardware **W# pin**. This allows the user to lock specific sections of the memory (Quarter, Half, or Entire array) to prevent accidental data corruption or overwriting. #### B. Low Power Consumption Designed for battery-operated devices, it consumes very little current: * **Standby Current:** Less than 1 µA (at 1.8V). * **Read Current:** 2 mA (at 20 MHz). #### C. Instruction Set The device operates via standard SPI opcodes, including: * `WREN`: Set Write Enable Latch. * `READ`: Read data from memory. * `WRITE`: Write data to memory. * `RDSR/WRSR`: Read/Write Status Register. ---