The **M93C76-RMB3TP** is a specific variant of the 8-Kbit serial MICROWIRE EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is widely used in automotive and industrial applications for non-volatile data storage. --- ### ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (8192 bits) | | **Organization** | Configurable: 1024 x 8 bits OR 512 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) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Temperature Range** | -40°C to +125°C (Grade 3) | | **Endurance** | 4 Million write cycles | | **Data Retention** | 200 Years | --- ### ## Core Electronic Characteristics ### 1. The MICROWIRE Interface Unlike I2C or SPI, the MICROWIRE protocol used here is a subset of SPI. It utilizes four signals: * **S (Chip Select):** Activates the device. * **D (Serial Data Input):** For opcodes, addresses, and data. * **Q (Serial Data Output):** For reading data. * **C (Serial Clock):** Synchronizes data transfer. ### 2. Flexible Organization (ORG Pin) One of the key electronic features of the M93C76 is the **ORG (Organization)** pin. * If the ORG pin is connected to **VCC**, the memory is organized as **512 x 16 bits**. * If the ORG pin is connected to **GND**, the memory is organized as **1024 x 8 bits**. * If left floating, it defaults to the x16 configuration in most implementations. ### 3. Write Protection The device includes a **Write Enable (WEN)** and **Write Disable (WDS)** instruction set. This provides a software-level lock to prevent accidental data corruption during power-up or power-down sequences. ### 4. Sequential Read While it is an 8-Kbit chip, it supports sequential reading. After a read instruction is issued, the internal address pointer automatically increments, allowing the entire memory contents to be read in a single continuous stream. --- ### ## Decoding the Part Number: M93C76-RMB3TP To understand the specific hardware attributes, we break down the suffix: * **M93C76:** Base part number (8-Kbit Microwire EEPROM). * **-R:** Operating Voltage range of 1.8V to 5.5V. * **MB:** Package code for UFDFPN8 (2x3 mm). * **3:** Device tested with High Reliability Certified flow (Automotive Grade, -40 to 125°C). * **T:** Tape and Reel packing. * **P:** ECOPACK2 (RoHS compliant/Lead-free).