## Technical Overview: LCMXO2-256HC-5TG100C The **LCMXO2-256HC-5TG100C** is a low-power, instant-on programmable logic device belonging to the **MachXO2 family** by Lattice Semiconductor. It is frequently used for system control functions, glue logic, and interface bridging. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Logic Cells (LUTs)** | 256 Look-Up Tables | | **User I/Os** | 78 Pins | | **Voltage Supply (Core)** | 2.375V to 3.465V (HC version) | | **Embedded Flash** | 256 bits (User Flash Memory) | | **RAM (Distributed)** | 2 Kbits | | **Package** | TQFP-100 (14x14 mm) | | **Speed Grade** | -5 (Standard speed) | | **Temperature Range** | 0°C to 85°C (Commercial Grade) | --- ### 2. Breakdown of the Part Number Understanding the alphanumeric code helps identify the specific capabilities of the chip: * **LCMXO2**: MachXO2 Product Family. * **256**: Density (approximately 256 Look-Up Tables). * **HC**: High-performance core voltage (2.5V to 3.3V). * **5**: Speed grade (5 is standard/mid-range). * **TG100**: Package type (TQFP, 100 pins). * **C**: Commercial temperature grade. --- ### 3. Core Features and Functionality #### A. Instant-On Technology Unlike many FPGAs that require an external SPI Flash to load their configuration on power-up, the MachXO2 features **on-chip non-volatile configuration memory**. This allows the device to become active in microseconds, making it ideal for managing power-up sequences of larger processors. #### B. Flexible I/O Support The 78 user I/Os support various signaling standards, including: * LVCMOS (3.3V, 2.5V, 1.8V, 1.5V, 1.2V) * LVTTL * PCI * Differential inputs (LVDS, Bus-LVDS) #### C. Built-in Hardened IP To save logic cells for user applications, Lattice includes "Hardened" (fixed-circuitry) blocks for common functions: * **I2C Interfaces** (Master/Slave) * **SPI Interfaces** * **Timer/Counters** * **Internal Oscillator** (No need for an external crystal for basic clocking) --- ### 4. Typical Applications * **I/O Expansion:** Adding more GPIOs to a microcontroller. * **Interface Bridging:** Converting signals between different formats (e.g., SPI to I2C). * **Power Sequencing:** Controlling the timing of power rails for CPUs and SoCs. * **Glue Logic:** Replacing multiple 74-series logic chips to save PCB space.