## M93C46-RMB3TP/W: Technical Overview The **M93C46-RMB3TP/W** is a specific variant of the widely used 1Kbit Serial MICROWIRE EEPROM (Electrically Erasable Programmable Read-Only Memory). It is manufactured by **STMicroelectronics**. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (1,024 bits) | | **Memory Organization** | Configurable: 64 x 16-bit or 128 x 8-bit | | **Interface** | MICROWIRE (3-Wire Serial) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | Up to 2 MHz | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +85°C (Industrial Grade) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### 2. Part Number Breakdown Understanding the suffix helps identify specific features of this component: * **M93C46**: The base part number for the 1Kbit MICROWIRE EEPROM. * **-R**: Indicates the low-voltage range (1.8V to 5.5V). * **MB**: Specifies the package type (**UFDFPN8**). * **3**: Indicates the device is qualified for Industrial temperature range (-40°C to +125°C variant, though often binned for 85°C). * **TP**: Tape and Reel packaging. * **W**: Indicates the process technology (often refers to a specific wafer fab or design revision). --- ### 3. Pin Configuration (UFDFPN8) The device typically follows a standard 8-pin layout: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **S** | Chip Select | | 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** | Don't Use / No Connect | | 8 | **Vcc** | Supply Voltage | --- ### 4. Core Features * **Write Protection:** Includes a software write-protection mechanism to prevent accidental data erasure. * **Sequential Read:** Allows for the continuous reading of the entire memory array by keeping Chip Select (S) high. * **Self-Timed Write Cycle:** The device handles the timing for internal programming, including an automatic erase-before-write sequence. * **Ready/Busy Signal:** The Data Output (Q) pin can be polled to check if the internal write cycle is complete. --- ### 5. Common Applications Due to its small footprint and low power consumption, it is commonly used in: * Storing configuration settings for networking hardware. * Calibration data in industrial sensors. * Identification data for modular peripherals. * Basic BIOS storage for small microcontrollers.