The **M93C86-RMB6T** is a specific variant of the 16-Kbit serial MICROWIRE EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by **STMicroelectronics**. It is widely used for non-volatile parameter storage in automotive and industrial applications. --- ## 1. Technical Specifications Below is a breakdown of the core electrical and physical characteristics: | Feature | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | MICROWIRE (3-wire serial interface) | | **Operating Voltage** | 1.8V to 5.5V (Low voltage support) | | **Clock Frequency** | 2 MHz (at 4.5V) / 1 MHz (at 1.8V) | | **Package Type** | UFDFPN8 (MLP8) - Ultra-thin Dual Flat No-lead | | **Temperature Range** | -40°C to +85°C (Industrial Grade 6) | | **Write Cycles** | 4 million cycles (at 25°C) | | **Data Retention** | 200 Years | --- ## 2. Decoding the Part Number To understand the specific electronic properties, we can break down the suffix **-RMB6T**: * **M93C86**: The base model series (16-Kbit Microwire EEPROM). * **-R**: Indicates the device operates at **1.8V to 5.5V**. * **MB**: Specifies the **UFDFPN8** (2x3 mm) package. * **6**: Indicates the temperature range of **-40°C to 85°C**. * **T**: Indicates the delivery method is **Tape & Reel**. --- ## 3. Key Electronic Features ### A. Selectable Organization The chip features an **ORG** pin. Depending on how this pin is wired: * If ORG is high (Vcc), the memory is organized as **1024 x 16 bits**. * If ORG is low (GND), the memory is organized as **2048 x 8 bits**. ### B. Self-Timed Write Cycle The device includes an internal timer. Once a write command is received, the chip manages the erasing and programming of the memory cells internally, freeing the host microcontroller for other tasks. ### C. Sequential Read It supports reading the entire memory contents via a single command by continuing to provide clock pulses after the first word is read. ### D. Status Register The **DO (Data Out)** pin serves a dual purpose. During a write cycle, it acts as a **Ready/Busy** indicator, allowing the microcontroller to poll the device to see if the write operation is complete. --- ## 4. Typical Application Circuit The device uses four main signal lines for communication: ```text Microcontroller M93C86-RMB6T [ CS ] -----------> [ Chip Select ] [ SK ] -----------> [ Serial Clock ] [ DI ] -----------> [ Data Input ] [ DO ] <----------- [ Data Output ] [ Vcc ] ----------- [ Power (1.8-5.5V) ] [ GND ] ----------- [ Ground ] ``` ---