## Technical Overview: M93C86-RBN3TP The **M93C86-RBN3TP** is a specialized non-volatile memory chip manufactured by **STMicroelectronics**. It belongs to the Microwire bus interface family, commonly used in automotive and industrial applications due to its reliability and specific voltage requirements. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | MICROWIRE (Serial Peripheral Interface - 3 Wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (@ 5V), 1 MHz (@ 1.8V) | | **Package Type** | TSSOP8 (Thin Shrink Small Outline Package) | | **Temperature Range** | -40°C to +125°C (Grade 3 - Automotive) | | **Data Retention** | 40 Years | | **Write Cycles** | 4,000,000 (4 Million) cycles | --- ### 2. Internal Architecture and Pins The device is organized internally as either 8-bit bytes or 16-bit words, depending on the logic level applied to the **ORG** (Organization) pin. #### Pin Configuration (TSSOP8) 1. **S (Chip Select):** Activates the device for communication. 2. **D (Serial Data Input):** Receives instructions and data. 3. **Q (Serial Data Output):** Transfers data out of the chip. 4. **C (Serial Clock):** Synchronizes the data transfer. 5. **ORG (Organization):** Sets the architecture ($x8$ or $x16$). 6. **Vss (Ground):** 0V reference. 7. **Vcc (Supply):** Power input (1.8V - 5.5V). 8. **PE (Program Enable):** Hardware protection for the write cycle. --- ### 3. Core Functionality * **Write Protection:** The device features a "Write Enable" and "Write Disable" instruction set to prevent accidental data corruption. * **Sequential Read:** It supports reading the entire memory map in a continuous stream after a single start command. * **Self-Timed Write Cycle:** Once a write command is sent, the chip manages the internal timing to store the data, typically taking around 5ms. * **Ready/Busy Signal:** During a write cycle, the Data Output (Q) pin can be used to poll the status of the chip. --- ### 4. Part Number Breakdown: M93C86-RBN3TP Understanding the nomenclature helps identify the exact variant: | Code | Meaning | | :--- | :--- | | **M93** | Microwire Serial Access EEPROM | | **C86** | 16 Kbit Density | | **-R** | Low Voltage Range (1.8V to 5.5V) | | **BN** | TSSOP8 Package (0.65mm pitch) | | **3** | Automotive Temperature Grade (-40°C to +125°C) | | **TP** | Tape & Reel Packaging | --- ### 5. Common Applications * **Automotive:** Odometer calibration, engine control units (ECU), and airbag modules. * **Industrial:** Parameter storage in sensors and robotics. * **Consumer:** Storing configuration settings in devices that require long-term data stability without power.