### M93C66-RMB6TP: Electronic Specifications and Overview The **M93C66-RMB6TP** is a 4-Kbit serial MICROWIRE EEPROM (Electrically Erasable Programmable Read-Only Memory) manufactured by STMicroelectronics. It is commonly used in industrial and consumer electronics for non-volatile data storage. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Size** | 4 Kbit (4096 bits) | | **Memory Organization** | Configurable: 256 x 16-bit or 512 x 8-bit | | **Interface** | MICROWIRE (3-Wire Serial) | | **Operating Voltage ($V_{CC}$)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Package Type** | UFDFPN8 (MLP8) - Ultra-thin Dual Flat No-lead | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Endurance** | 4 million write cycles | | **Data Retention** | 200 years | --- ### 2. Pin Configuration (UFDFPN8) The device typically follows a standard 8-pin layout for MICROWIRE EEPROMs: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **S** | Chip Select (Active High) | | 2 | **C** | Serial Clock | | 3 | **D** | Serial Data Input | | 4 | **Q** | Serial Data Output | | 5 | **$V_{SS}$** | Ground | | 6 | **ORG** | Organization Select (High: x16, Low: x8) | | 7 | **DU** | Don't Use / No Connect | | 8 | **$V_{CC}$** | Supply Voltage | --- ### 3. Core Features * **Configurable Organization:** The `ORG` pin allows the user to define the memory structure. Setting it High enables a 16-bit word structure, while setting it Low enables an 8-bit byte structure. * **Sequential Read:** The device supports reading the entire memory contents via a single command by continuing to provide clock pulses. * **Write Protection:** Includes a specific "Write Disable" (WDS) instruction to prevent accidental data corruption. * **Low Power Consumption:** Optimized for battery-operated devices with a low standby current. --- ### 4. Part Number Breakdown: M93C66-RMB6TP The suffix codes provide specific information about the physical and chemical properties of the chip: * **M93C66**: Base Part Number (4 Kbit Microwire EEPROM). * **-R**: Operating Voltage range (1.8V to 5.5V). * **MB**: Package type (UFDFPN8, 2x3mm). * **6**: Temperature range (-40°C to +85°C). * **T**: Packing (Tape and Reel). * **P**: Eco-Pack / RoHS compliant (Lead-free). --- ### 5. Application Circuit Example (Pseudo-Logic) When connecting to a microcontroller, the `S` (Chip Select) must be driven high to initiate communication. ```c // Example: Basic Read Sequence Logic 1. Drive S (Chip Select) HIGH. 2. Send 'Read' Opcode (110) via D (Data In). 3. Send Address (8 or 9 bits depending on ORG). 4. Clock out data from Q (Data Out). 5. Drive S (Chip Select) LOW to terminate. ``` ---