The **M93C56-RMB3G** is a specific variant of a serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory). It is commonly used for non-volatile data storage in consumer electronics, automotive systems, and industrial controllers. Below is a detailed breakdown of its specifications and electronic characteristics. --- ## 1. Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 2 Kbit (2048 bits) | | **Organization** | Configurable: 256 x 8 bits or 128 x 16 bits | | **Interface** | Microwire (3-wire serial) | | **Supply Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 5V), 1 MHz (@ 1.8V) | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 3) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ## 2. Pin Configuration (UFDFPN8) The device typically uses an 8-pin layout. The "ORG" pin is critical as it defines how the memory is addressed. | Pin Name | Function | Description | | :--- | :--- | :--- | | **S** | Chip Select | Activates the device when HIGH. | | **D** | Serial Data Input | Receives instructions and data. | | **Q** | Serial Data Output | Outputs data during read cycles. | | **C** | Serial Clock | Synchronizes data transfer. | | **ORG** | Organization | High = x16 mode; Low/GND = x8 mode. | | **W** | Write Control | Hardware protection against write instructions. | | **$V_{CC}$ / $V_{SS}$** | Power / Ground | Supply voltage and reference ground. | --- ## 3. Key Electronic Features ### A. Low Voltage Operation The **-R** suffix in the part number indicates a low-voltage range (1.8V to 5.5V). This makes it ideal for battery-powered devices where power efficiency is critical. ### B. Sequential Read While the device is addressed randomly, it supports sequential reading. Once a read command is initiated, the device will continue to output data from subsequent addresses as long as the clock continues, without needing new instructions. ### C. Self-Timed Write Cycle The chip includes an internal timer. Once a write command is received, the device handles the erasure and programming internally (typically taking 5ms), freeing the host microcontroller for other tasks. ### D. Hardware & Software Protection * **Status Register:** Includes a Ready/Busy bit to check if a write is in progress. * **Write Enable/Disable:** Instructions must be sent to "unlock" the memory before any write operation can occur. --- ## 4. Decoding the Part Number: M93C56-RMB3G | Segment | Meaning | | :--- | :--- | | **M93** | Microwire family EEPROM | | **C56** | 2 Kbit density | | **-R** | Voltage range: 1.8V to 5.5V | | **MB** | Package: UFDFPN8 (2x3 mm) | | **3** | Temperature range: -40 to +125 °C | | **G** | ECOPACK2 (RoHS compliant, Halogen-free) | ---