The **M93C76-RMB7TP** is an 8-Kbit serial Microwire EEPROM (Electrically Erasable Programmable Read-Only Memory) developed by STMicroelectronics. It is designed for low-voltage applications and organized in a flexible user-configurable memory structure. --- ## 1. Key Specifications The following table summarizes the primary electrical and operational characteristics of the device: | Feature | Specification | | :--- | :--- | | **Memory Size** | 8 Kbit (8,192 bits) | | **Memory Organization** | 1024 x 8-bit OR 512 x 16-bit (User Selectable) | | **Interface Protocol** | Microwire (3-Wire Serial) | | **Operating Voltage** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Operating Temperature** | -40°C to +125°C (Automotive Grade 3) | | **Package Type** | UFDFPN8 (Ultra-thin Fine pitch Dual Flat No-lead) | | **Write Cycles** | 4 Million cycles | | **Data Retention** | 200 Years | --- ## 2. Pin Configuration (UFDFPN8) The device uses a compact 8-pin layout. Understanding the pinout is critical for PCB integration: | Pin | Designation | 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/Float = x8) | | 7 | **DU** | Don't Use (Must be connected to Vss or left floating) | | 8 | **Vcc** | Supply Voltage | --- ## 3. Core Functional Features ### A. Organization Select (ORG) The M93C76 is unique because the user can choose the data bus width via the **ORG** pin. * If ORG is tied to **Vcc**, the device operates as **512 x 16-bit**. * If ORG is tied to **Vss**, the device operates as **1024 x 8-bit**. ### B. Microwire Interface This is a synchronous serial communication protocol. It requires four signals: Chip Select (S), Serial Clock (C), Data Input (D), and Data Output (Q). It is widely used in legacy automotive and industrial systems for its simplicity. ### C. Self-Timed Programming The device features an internal write cycle. Once a write command is sent, the chip manages the erasing and writing of the cell internally, freeing up the host microcontroller to perform other tasks. ### D. Data Protection To prevent accidental data corruption, the M93C76 includes: * **Write Enable/Disable (WEN/WDS):** Software commands that lock the memory against write instructions. * **Power-on Reset:** Protects data during power transitions. --- ## 4. Typical Applications * **Automotive:** Storing calibration data, odometer readings, and VIN information. * **Industrial:** Configuration settings for sensors and actuators. * **Consumer Electronics:** Storing user preferences in battery-powered devices.