## Technical Overview of M95128-RBN3P The **M95128-RBN3P** is a high-performance, electrically erasable programmable memory (EEPROM) manufactured by STMicroelectronics. It belongs to the SPI (Serial Peripheral Interface) family and is specifically designed for low-voltage applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 128 Kbit (16,384 bytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Package Type** | PDIP8 (Plastic Dual In-line Package, 8 pins) | | **Operating Temperature** | -40°C to +125°C | | **Page Size** | 64 Bytes | | **Write Cycles** | 4 million cycles | | **Data Retention** | 200 years | --- ### 2. Pin Configuration | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S#** | Chip Select: Activates the device when pulled low. | | 2 | **Q** | Serial Data Output: Sends data out to the master. | | 3 | **W#** | Write Control: Provides hardware protection against write operations. | | 4 | **Vss** | Ground. | | 5 | **D** | Serial Data Input: Receives data from the master. | | 6 | **C** | Serial Clock: Synchronizes data movement. | | 7 | **HOLD#** | Hold: Pauses serial communication without deselecting the device. | | 8 | **Vcc** | Supply Voltage. | --- ### 3. Core Functional Features * **Instruction Set:** The device operates using a standard set of SPI opcodes including Write Enable (WREN), Read Identifier (RDID), Read Status Register (RDSR), and Byte/Page Write. * **Write Protection:** * **Software Protection:** Block protection bits in the Status Register allow the user to protect quarters, halves, or the entire memory array. * **Hardware Protection:** The **W#** pin can be used to freeze the Status Register, preventing any changes to the protection settings. * **Low Power Consumption:** Optimized for battery-operated devices with a very low standby current. * **High Reliability:** Designed for automotive and industrial grade environments requiring high cycling endurance. --- ### 4. Part Number Breakdown: M95128-RBN3P * **M95:** SPI Family EEPROM. * **128:** Density (128 Kbits). * **-R:** Operating Voltage range (1.8V to 5.5V). * **BN:** Package (PDIP8, 0.25 mm pitch). * **3:** Range 3 temperature (-40 to +125 °C). * **P:** RoHS compliant/Lead-free.