The **M93C46-RBN3G** is a 1-Kbit low-voltage serial EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. It is commonly used in consumer electronics for storing configuration data, calibration settings, and device IDs. --- ## 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (1,024 bits) | | **Organization** | Configurable: 64 x 16-bit or 128 x 8-bit | | **Interface** | MICROWIRE (3-wire serial) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | PDIP8 (Plastic Dual In-line Package, 8 pins) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ## 2. Pinout Configuration (PDIP8) The device typically follows the standard 8-pin layout for MICROWIRE EEPROMs: 1. **S (Chip Select):** Activates the device when held high. 2. **C (Serial Clock):** Used to synchronize data transfer. 3. **D (Serial Data Input):** Receives instructions and data. 4. **Q (Serial Data Output):** Outputs data during read operations. 5. **$V_{SS}$:** Ground. 6. **ORG (Organization):** Sets the word width (High for x16, Low/Floating for x8). 7. **DU/NC:** Do not use or Not Connected. 8. **$V_{CC}$:** Power supply. --- ## 3. Core Functional Features ### A. Flexible Organization The **ORG** pin allows the user to define how the memory is accessed. This is useful for matching the memory structure to the processor's data bus (8-bit microcontrollers vs. 16-bit DSPs). ### B. Self-Timed Write Cycle The device features an internal control logic that handles the erase/write cycle automatically. Once a write command is sent, the chip manages the timing, freeing the host microcontroller for other tasks. ### C. Write Protection To prevent accidental data loss, the M93C46 includes a **Write Enable (WEN)** and **Write Disable (WDS)** instruction set. The device powers up in the Write Disable state by default. ### D. Sequential Read The device supports reading the entire memory contents sequentially. After a read command, if the clock continues, the device automatically increments the address and outputs the next data word. --- ## 4. Part Number Breakdown: M93C46-RBN3G * **M93C46:** Device Type (1 Kbit Microwire EEPROM). * **-R:** Operating Voltage (1.8V to 5.5V). * **BN:** Package (PDIP8, 0.25mm lead frame). * **3:** Temperature Range (-40 to +125°C). * **G:** ECOPACK2 (RoHS compliant, Halogen-free). ---