The **M93C46-RMB3P/S** is a specific variant of the M93C46 family, which are 1-Kbit low-voltage Serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory) devices. These are commonly used for storing configuration data, user preferences, or calibration settings in embedded systems. --- ## 1. Technical Specifications Below are the primary technical parameters for this specific part number: | Feature | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (1,024 bits) | | **Organization** | User-selectable: 64 x 16-bit or 128 x 8-bit | | **Interface** | Microwire (3-wire serial interface) | | **Operating Voltage** | 1.8V to 5.5V (Low Voltage) | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Data Retention** | > 40 Years | | **Endurance** | 1,000,000 Write Cycles | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | --- ## 2. Part Number Breakdown (Suffix Decoding) The suffix **RMB3P/S** provides critical information about the packaging and processing: * **R**: Operating voltage range of **1.8V to 5.5V**. * **MB**: Represents the package type, typically **UFDFPN8** (Ultra-thin Fine pitch Dual Flat No-lead, 2x3 mm). * **3**: Indicates the device is **Grade 3** (Industrial temperature range -40 to +125°C, though standard "R" versions usually target -40 to +85°C; verify with the specific ST datasheet for the "3" suffix). * **P/S**: Usually denotes **RoHS compliance** (Green/Halogen-free) and specific tape-and-reel or standard shipping formats. --- ## 3. Pin Configuration & Functions In a standard 8-pin package, the pins function as follows: | Pin | Name | Description | | :--- | :--- | :--- | | 1 | **S** | Chip Select (Active High) | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (High: x16, Low: x8) | | 7 | **DU/NC** | Don't Use or No Connect | | 8 | **Vcc** | Supply Voltage | --- ## 4. Key Features * **Self-Timed Programming:** The device handles the internal write cycle automatically once the command is received. * **Ready/Busy Status:** During a write cycle, the Data Output (Q) pin can be polled to check if the device is busy. * **Sequential Read:** Allows for continuous data streaming across the entire memory array. * **Software Write Protection:** Instructions are available to enable or disable write operations to prevent accidental data corruption. ---