## Electronic Characteristics of M95640-RBN3G The **M95640-RBN3G** is a high-performance, electrically erasable programmable read-only memory (**EEPROM**) manufactured by STMicroelectronics. It is organized as 8192 x 8 bits (64 Kbit) and communicates via the Serial Peripheral Interface (SPI) bus. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 64 Kbit (8 Kbytes) | | **Interface** | SPI (Serial Peripheral Interface) | | **Clock Frequency** | Up to 20 MHz | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Page Size** | 32 Bytes | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 Years | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Part Number Breakdown (Decoding) Understanding the suffix **-RBN3G** helps identify the specific variant: * **M95640**: Device family (64 Kbit SPI EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **BN**: Package code for **PDIP8** (Plastic Dual In-line Package, 8 pins). * **3**: Temperature Range 3 (-40°C to +125°C). * **G**: ECOPACK2 (RoHS compliant and Halogen-free). --- ### 3. Pin Configuration and Functions The device typically uses an 8-pin layout. Below is the functional mapping: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S#** | Chip Select (Active Low) | | 2 | **Q** | Serial Data Output | | 3 | **W#** | Write Control / Protect | | 4 | **$V_{SS}$** | Ground | | 5 | **D** | Serial Data Input | | 6 | **C** | Serial Clock | | 7 | **HOLD#** | Hold (Suspends serial communication) | | 8 | **$V_{CC}$** | Supply Voltage | --- ### 4. Functional Features * **Byte and Page Write:** Supports writing a single byte or a full page (up to 32 bytes) in a single cycle. The self-timed write cycle completes in under **5 ms**. * **Hardware & Software Protection:** * **Status Register:** Includes a Write Enable Latch (WEL) bit. * **Block Protection:** Can lock quarter, half, or the entire memory array via software bits. * **Write Protect Pin (W#):** Provides hardware protection for the status register. * **Clock Speed:** Operates at high speeds (20 MHz at $V_{CC} > 4.5V$), making it suitable for fast data logging and parameter storage. --- ### 5. Common Applications * **Automotive:** Storing calibration data and odometer readings (due to the -40°C to +125°C range). * **Industrial:** Configuration settings for PLCs and sensors. * **Consumer Electronics:** Firmware parameters and user preferences in appliances.