## Technical Overview: M93C86-RMB3 The **M93C86-RMB3** is a 16-Kbit serial EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. It is designed for low-voltage applications and utilizes a Microwire bus interface. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Memory Density** | 16 Kbit (2,048 x 8 bits or 1,024 x 16 bits) | | **Interface** | Microwire (3-wire serial) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | Up to 2 MHz (at 4.5V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +125°C (Automotive grade 3) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### 2. Functional Description The device is organized internally depending on the logic state of the **ORG** (Organization) pin. This flexibility allows it to fit different system architectures: * **x8 Mode:** The memory is addressed as 2,048 bytes of 8 bits each. * **x16 Mode:** The memory is addressed as 1,024 words of 16 bits each. #### Standard Instruction Set: The M93C86 operates via a set of standard instructions sent through the Serial Input (D) pin: * **READ:** Read data from memory. * **WRITE:** Write data to memory. * **WEN/WDS:** Write Enable / Write Disable (Security latches). * **ERASE:** Erase a specific address. --- ### 3. Pin Configuration The **UFDFPN8** package (represented by the "MB" code in the suffix) typically uses the following pinout: | Pin | Symbol | Function | | :--- | :--- | :--- | | 1 | S | Chip Select | | 2 | C | Serial Clock | | 3 | D | Serial Data Input | | 4 | Q | Serial Data Output | | 5 | $V_{SS}$ | Ground | | 6 | ORG | Internal Organization (x8 / x16) | | 7 | DU | Don't Use / No Connection | | 8 | $V_{CC}$ | Supply Voltage | --- ### 4. Part Number Breakdown: M93C86-RMB3 * **M93C86:** Device Family (16 Kbit Microwire EEPROM). * **-R:** Operating Voltage Range (1.8V to 5.5V). * **MB:** Package Code (UFDFPN8 2x3mm). * **3:** Temperature Range (-40°C to +125°C). --- ### 5. Application Areas Due to its high endurance and wide temperature range, this part is commonly found in: * **Automotive:** Storing calibration data or odometer readings. * **Industrial:** Configuration storage for sensors and controllers. * **Consumer Electronics:** Parameter storage in battery-powered devices.