The **M93C46-RMB3** is a specific variant of the 1-Kbit serial Microwire EEPROM (Electrically Erasable Programmable Memory). It is commonly used in applications requiring non-volatile storage for configuration parameters, such as network cards, printers, and consumer electronics. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Memory Size** | 1 Kbit (1,024 bits) | | **Organization** | User-selectable: 128 x 8 bits or 64 x 16 bits | | **Interface** | Microwire (3-wire serial interface) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Write Cycles** | More than 1,000,000 (1 Million) cycles | | **Data Retention** | > 40 Years | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | --- ### 2. Decoding the Part Number The suffix **-RMB3** provides specific information about the voltage, package, and temperature range: * **M93C46**: Base model number for the 1K Microwire EEPROM. * **-R**: Indicates the operating voltage range (1.8V to 5.5V). * **MB**: Represents the **UFDFPN8** package (also known as MLP 2x3mm). * **3**: Indicates the Temperature Range **-40°C to +125°C** (Automotive Grade 3). --- ### 3. Pin Configuration and Functions The M93C46 typically uses the following pins for communication: | Pin Name | Function | Description | |:---|:---|:---| | **S (CS)** | Chip Select | Activates the device when high. | | **D (MIC)** | Serial Data Input | Receives instructions and data. | | **Q (MOC)** | Serial Data Output | Outputs data during read cycles. | | **C (SK)** | Serial Clock | Synchronizes data movement. | | **ORG** | Organization Select | High = x16 organization; Low/NC = x8 organization. | | **VCC/VSS** | Power Supply | Voltage input and Ground. | --- ### 4. Operational Features * **Self-Timed Programming**: The device handles the internal erase and write timing automatically, so the host controller doesn't need to manage the write duration. * **Ready/Busy Status**: During a write cycle, the data output pin (Q) can be polled to check if the memory is still busy or ready for the next command. * **Software Write Protection**: Includes instructions to enable or disable write operations, protecting data from accidental corruption. ---