The **M93C76-RMB7** is a specific variant of the 8-Kbit serial MICROWIRE EEPROM (Electrically Erasable Programmable Memory) manufactured by STMicroelectronics. This component is widely used for non-volatile parameter storage in automotive and industrial applications. --- ## 1. Technical Specifications Below are the key technical parameters for the M93C76-RMB7: | Parameter | Value | | :--- | :--- | | **Memory Size** | 8 Kbit (8,192 bits) | | **Organization** | 1024 x 8 bits OR 512 x 16 bits (User selectable) | | **Interface** | MICROWIRE (3-wire serial) | | **Supply Voltage (Vcc)** | 1.8V to 5.5V | | **Clock Frequency** | 2 MHz (at 4.5V - 5.5V) | | **Operating Temperature** | -40°C to +105°C | | **Package Type** | UFDFPN8 (MLP8) - 2x3 mm | | **Write Cycles** | 1,000,000 cycles (minimum) | | **Data Retention** | 40 Years (minimum) | --- ## 2. Pin Configuration (UFDFPN8) The device uses a standard 8-pin layout to communicate with the host microcontroller (MCU). | Pin | 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/Float = x8) | | 7 | **DU** | Don't Use (Must be left floating or connected to Vss) | | 8 | **Vcc** | Supply Voltage | --- ## 3. Key Electronic Features ### A. The "R" Voltage Range The **"R"** in the part number indicates a wide supply voltage range of **1.8V to 5.5V**. This makes it compatible with low-power battery-operated devices as well as standard 5V industrial logic. ### B. Sequential Read Unlike some older EEPROMs, the M93C76 supports sequential reading. After the first 8 or 16 bits are read, the device will automatically increment the address and output the next data block as long as the clock continues and Chip Select remains high. ### C. Self-Timed Write Cycle The device handles the erase/write internal timing automatically. Once a write command is sent, the chip manages the high-voltage generation and timing internally, freeing up the MCU for other tasks. ### D. Package Suffix "MB7" * **MB**: Represents the **UFDFPN8** package (Ultra-thin Fine pitch Dual Flat No-lead). This is a very small, surface-mount package ideal for space-constrained PCBs. * **7**: Indicates the device is qualified for **Device Grade 7**, which corresponds to an operating temperature range of **-40°C to +105°C**. --- ## 4. Part Number Breakdown ```text M93C76 - R MB 7 | | | | | | | | | +-- Operating Temp (-40 to +105°C) | | | +----- Package (UFDFPN8) | | +-------- Voltage Range (1.8V to 5.5V) | +------------- Density (8 Kbit) +---------------- Series (Microwire EEPROM) ```