The **LCMXO2-256UHC-5QN84C** is a member of the **MachXO2** family of FPGAs (Field Programmable Gate Arrays) produced by **Lattice Semiconductor**. These devices are categorized as "bridging" FPGAs, often used for system control, interface expansion, and glue logic. --- ## 1. Part Number Breakdown Understanding the specific suffix is crucial for identifying technical specifications: | Part Segment | Meaning | Specification | | :--- | :--- | :--- | | **LCMXO2** | Family Series | MachXO2 (Ultra-low power, instant-on) | | **256** | Density | 256 Look-Up Tables (LUTs) | | **UHC** | Voltage/Feature | Ultra High Performance / Low Power (1.2V core) | | **5** | Speed Grade | Standard Speed (5 is standard for this family) | | **QN84** | Package Type | 84-pin QFN (Quad Flat No-lead) | | **C** | Temp Grade | Commercial (0°C to +85°C) | | **TRES** | Special Code | Typically refers to Tape & Reel packaging or specific revision | --- ## 2. Key Technical Specifications This device is designed for low-complexity tasks that require high I/O counts relative to their small size. ### Core Architecture * **LUTs:** 256 4-input Look-Up Tables. * **User Flash Memory (UFM):** Non-volatile storage for user data or configuration. * **Embedded Functional Blocks:** Includes hard-coded I2C, SPI, and Timer/Counter blocks to save logic cells. * **Instant-On:** The device configures itself from internal flash in microseconds. ### Electrical Characteristics * **Core Voltage:** 1.2V (High-performance version). * **I/O Standards:** Supports LVCMOS (3.3V, 2.5V, 1.8V, 1.5V, 1.2V), LVTTL, PCI, and differential signaling (LVDS, RSDS). * **I/O Count:** 56 User I/Os in the 84-pin package. --- ## 3. Comparison with Similar Logic The MachXO2-256 is often compared to CPLDs (Complex Programmable Logic Devices) because of its non-volatile nature. | Feature | MachXO2-256 | Traditional CPLD | | :--- | :--- | :--- | | **Configuration** | Internal Flash (SRAM based) | Macrocell based | | **Standby Power** | Extremely Low (uA range) | Moderate to High | | **Hard IP Blocks** | I2C, SPI, Timers included | Usually none | | **Routing** | Flexible FPGA fabric | Fixed Product Term | --- ## 4. Common Applications Due to its small footprint and low power, the **LCMXO2-256UHC-5QN84C** is frequently found in: 1. **System Reset & Sequencing:** Managing the power-up order of larger SoCs or CPUs. 2. **I/O Expansion:** Adding extra GPIO, I2C, or UART ports to a microcontroller. 3. **Bridge Logic:** Converting signals between different voltage levels or protocols (e.g., SPI to Parallel). 4. **Display Driving:** Handling small LED matrices or interface timing for LCDs. ---