The **M93C86-RDS3TG/S** is a specific variant of the 16-Kbit serial Microwire EEPROM (Electrically Erasable Programmable Memory) manufactured by **STMicroelectronics**. --- ### 1. Technical Specifications The table below summarizes the core electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Memory Size** | 16 Kbit (2048 x 8 bits or 1024 x 16 bits) | | **Interface** | Microwire (Serial 3-Wire) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Package Type** | TSSOP8 (Thin Shrink Small Outline Package) | | **Temperature Range** | -40°C to +125°C (Automotive Grade 3) | | **Write Cycles** | 4 Million cycles (typical) | | **Data Retention** | 200 Years | --- ### 2. Part Number Breakdown The suffixing in STMicroelectronics part numbers provides critical information regarding the packaging and grade: * **M93C86**: Device Family (16-Kbit Microwire EEPROM). * **-R**: Operating Voltage Range (1.8V to 5.5V). * **DS**: Package (TSSOP8, 169 mil width). * **3**: Temperature Range (-40 to +125 °C). * **TG**: Tape & Reel Packing / Green (RoHS compliant). * **/S**: Special Process / Automotive Grade (often indicates specific screening or assembly line). --- ### 3. Key Functional Features * **Sequential Read:** Allows reading the entire memory contents with a single command by continuing to provide clock pulses. * **Organization:** The memory can be configured as 8-bit (byte-wide) or 16-bit (word-wide) depending on the logic level at the "ORG" pin. * **Write Protection:** Includes a Write Enable (WEN) and Write Disable (WDS) instruction set to prevent accidental data erasure. * **Self-Timed Programming:** The device handles the internal erase/write timing automatically, freeing up the host microcontroller. --- ### 4. Typical Application Circuit The chip communicates via four signals: Chip Select (S), Serial Clock (C), Serial Data Input (D), and Serial Data Output (Q). ```cpp // Schematic Connection Example // Pin 1: S (Chip Select) -> MCU GPIO // Pin 2: C (Serial Clock) -> MCU SCK // Pin 3: D (Data In) -> MCU MOSI // Pin 4: Q (Data Out) -> MCU MISO // Pin 5: VSS -> Ground // Pin 6: ORG -> VCC (for x16) or GND (for x8) // Pin 7: DU -> Don't Use (Leave Floating) // Pin 8: VCC -> 1.8V - 5.5V Power ``` ---