## Electronic Overview: M93C86-RBN3 The **M93C86-RBN3** is a 16-Kbit serial MICROWIRE EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is designed for low-power applications and is commonly used for storing configuration data, user settings, and calibration parameters. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbits (2,048 x 8 bits or 1,024 x 16 bits) | | **Interface** | MICROWIRE (3-wire serial interface) | | **Operating Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) / 1 MHz (at 1.8V) | | **Package Type** | DIP8, SO8, or TSSOP8 (Standard 8-pin) | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3) | | **Write Cycles** | More than 1,000,000 cycles | | **Data Retention** | More than 40 years | --- ### 2. Pin Configuration and Functions The device typically follows a standard 8-pin layout. The functionality of the pins is described below: | Pin | Name | Description | | :--- | :--- | :--- | | **1** | S (Chip Select) | Activates the device when set to High. | | **2** | C (Serial Clock) | Synchronizes the data transfer. | | **3** | D (Serial Data Input) | Used to transfer op-codes, addresses, and data. | | **4** | Q (Serial Data Output) | Used to read data from the memory. | | **5** | Vss | Ground (0V). | | **6** | ORG (Organization) | Sets memory to x8 (GND) or x16 (Vcc) architecture. | | **7** | DU (Don't Use) | No internal connection (should be tied to Vcc or GND). | | **8** | Vcc | Supply voltage. | --- ### 3. Core Features * **Selectable Organization:** Through the **ORG** pin, the user can choose whether the 16K memory is accessed as 2,048 bytes or 1,024 16-bit words. * **Sequential Read:** Allows reading the entire memory contents with a single command by continuing to provide clock cycles. * **Self-Timed Write Cycle:** The device handles the internal timing for erasing and writing data, typically completing in less than 5ms. * **READY/BUSY Status:** During a write cycle, the Data Output (Q) pin can be monitored to determine if the device has finished its internal operation. * **Software Write Protection:** Commands like `WEN` (Write Enable) and `WDS` (Write Disable) protect data from accidental corruption. --- ### 4. Part Number Decoding (M93C86-RBN3) The suffix provides specific details about the variation: * **M93C86**: Basic Part Number (16-Kbit Microwire EEPROM). * **-R**: Range for Supply Voltage (1.8V to 5.5V). * **BN**: Package Type (typically PDIP8). * **3**: Temperature Range (-40 to +125 °C).