The **M93C66-RMB7TP** is a specific type of Non-Volatile Memory (NVM) produced by STMicroelectronics. It belongs to the Microwire bus family of Serial EEPROMs. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of this component: | Feature | Specification | | :--- | :--- | | **Memory Size** | 4 Kbit (4096 bits) | | **Memory Organization** | 256 x 16-bit or 512 x 8-bit (Configurable via ORG pin) | | **Interface** | Microwire (3-wire Serial) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | Up to 2 MHz | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | UFDFPN8 (MLP8) - Ultra-thin Fine Pitch Dual Flat No-lead | | **Write Cycles** | 4 Million cycles | | **Data Retention** | 200 Years | --- ## 2. Key Internal Parts & Functionality The device consists of several internal blocks that manage data integrity and communication: ### A. Memory Array The core of the chip is a 4-Kbit EEPROM array. It uses a floating-gate transistor technology that allows data to remain stored even when the power is disconnected. ### B. Control Logic & Instruction Decoder Since it uses the Microwire protocol, the chip interprets specific opcodes sent via the **DI (Data Input)** pin. These instructions include: * **READ:** Read data from memory. * **WRITE:** Write data to memory. * **WEN/WDS:** Write Enable and Disable (Safety latch). * **ERAL/WRAL:** Erase all or Write all (Bulk operations). ### C. The "ORG" Pin (Organization) One of the most important hardware features. The state of the ORG pin determines how the memory is accessed: * **Connected to Vcc:** Organized as 256 words of 16 bits. * **Connected to Vss (GND):** Organized as 512 bytes of 8 bits. --- ## 3. Pinout Description (UFDFPN8) | 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** | Internal Organization (x8 or x16) | | 7 | **DU** | Don't Use (Internal connection) | | 8 | **Vcc** | Supply Voltage | --- ## 4. Part Number Decoding The suffix **RMB7TP** provides specific manufacturing details: * **R:** Supply Voltage range (1.8V to 5.5V). * **MB:** Package type (UFDFPN8 2x3 mm). * **7:** Device grade (Industrial temperature range -40 to 85°C). * **TP:** Packing type (Tape & Reel).