The **M93C46-RDS6TG/S** is a specific variant of the widely used 93C46 family of serial EEPROM (Electrically Erasable Programmable Read-Only Memory) chips. It is manufactured by **STMicroelectronics**. --- ## 1. Technical Specifications This device is a low-voltage, serial memory component typically used for storing configuration data, calibration constants, or device IDs. | Parameter | Specification | | :--- | :--- | | **Memory Size** | 1 Kbit (1,024 bits) | | **Organization** | User-selectable: 64 x 16-bit or 128 x 8-bit | | **Interface** | MICROWIRE (Serial Peripheral Interface variant) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | Up to 2 MHz (at 5V) | | **Package Type** | TSSOP8 (Thin Shrink Small Outline Package) | | **Temperature Range** | -40°C to +85°C (Industrial Grade) | | **Endurance** | 4 Million Write Cycles | | **Data Retention** | 200 Years | --- ## 2. Part Number Breakdown Understanding the suffix is critical for procurement and PCB design: * **M93C46**: Base model (1 Kbit Microwire EEPROM). * **-R**: Operating voltage range (1.8V to 5.5V). * **D**: Device manufactured in a specific process technology (often indicates a shrinkage/revision). * **S**: Package code for **TSSOP8** (3mm width). * **6**: Temperature range 6 (-40 to +85 °C). * **TG**: Tape & Reel packing with Green/RoHS compliance. * **S**: Specific STMicroelectronics internal manufacturing code/site. --- ## 3. Pinout Configuration (TSSOP8) The device uses a standard 8-pin layout to handle serial communication: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **S** | Chip Select (Active High) | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **Vss** | Ground | | 6 | **ORG** | Organization Select (High: x16, Low: x8) | | 7 | **DU** | Don't Use (Internal connection, leave floating or GND) | | 8 | **Vcc** | Supply Voltage | --- ## 4. Key Features & Usage ### Memory Organization The **ORG** pin is a hardware configuration pin. If tied to $V_{cc}$, the memory is addressed as 64 words of 16 bits each. If tied to $V_{ss}$, it functions as 128 bytes of 8 bits each. ### Data Protection * **Software Write Protection**: The device includes a "Write Disable" (WDS) instruction to prevent accidental data corruption during power-up or power-down sequences. * **Ready/Busy Status**: During a write cycle, the data output pin (**Q**) can be polled to check if the internal programming cycle is complete. ### Typical Applications * Ethernet MAC addresses. * Monitor/TV calibration data. * Automotive electronic control units (ECUs). * Small firmware configurations for microcontrollers. ---