## Technical Overview: M93C86-RMB3TP The **M93C86-RMB3TP** is a high-performance, low-voltage **EEPROM** (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is part of the 93Cx6 family, which uses a Microwire-compatible serial interface. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (16,384 bits) | | **Organization** | 2048 x 8-bit or 1024 x 16-bit (User selectable) | | **Interface** | Microwire (3-Wire Serial) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 5V), 1 MHz (@ 1.8V) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Operating Temperature** | -40°C to +125°C (Grade 3) | | **Data Retention** | 40 Years | | **Write Cycles** | 4,000,000 cycles | --- ### 2. Functional Pins and Architecture The device uses a simple serial interface consisting of four main signal lines. In the **UFDFPN8** package, the pinout typically follows this logic: 1. **S (Chip Select):** Used to activate the device. 2. **D (Serial Data Input):** Used to transfer opcodes, addresses, and data. 3. **Q (Serial Data Output):** Used to read data or check the "Ready/Busy" status. 4. **C (Serial Clock):** Synchronizes all data transfers. 5. **ORG (Organization Select):** * Connect to **Vcc** for $\times 16$ organization. * Connect to **GND** for $\times 8$ organization. 6. **Vcc/Vss:** Power supply and Ground. --- ### 3. Key Features * **Sequential Read:** Allows reading the entire memory contents with a single instruction by continuing to provide clock pulses. * **Write Protection:** Includes a "Write Enable" (WEN) and "Write Disable" (WDS) instruction set to prevent accidental data corruption. * **Self-Timed Programming:** The device handles the internal erase/write timing, freeing up the host microcontroller. * **Ready/Busy Status:** The Data Output (Q) pin acts as a status indicator during write cycles, signaling when the memory is ready for the next operation. --- ### 4. Part Number Breakdown: M93C86-RMB3TP To understand the specific variant, here is the decoding: | Code | Meaning | | :--- | :--- | | **M93** | Microwire Interface EEPROM | | **C86** | 16 Kbit density | | **-R** | 1.8V to 5.5V supply voltage | | **MB** | UFDFPN8 (2x3 mm) package | | **3** | Range 3 (-40 to +125 °C) | | **TP** | Tape & Reel packaging | --- ### 5. Common Applications * **Automotive:** Storing calibration data, odometer readings, or setting preferences in ECUs. * **Industrial:** Storing configuration parameters for sensors or motor controllers. * **Consumer Electronics:** Storing firmware settings and user profiles in battery-operated devices.