Lattice LC4128V-75TN100-10I: A Comprehensive Technical Overview of the CPLD
In the realm of digital logic design, Complex Programmable Logic Devices (CPLDs) remain a cornerstone for "glue logic," system configuration, and control applications. Among these, the Lattice LC4128V-75TN100-10I stands out as a robust and versatile solution from Lattice Semiconductor's high-performance family. This article provides a detailed technical examination of this specific component.
The LC4128V-75TN100C belongs to the Lattice ispMACH 4000V CPLD family, fabricated with advanced CMOS technology. The "128" in its designation signifies its core capacity: it contains 128 macrocells. These macrocells are the fundamental building blocks of the CPLD, organized into multiple Function Blocks, allowing for efficient implementation of complex combinational and sequential logic. The device is housed in a 100-pin Thin Quad Flat Pack (TQFP) package, a popular surface-mount type that offers a good balance between physical size and pin count for a wide range of applications.
A key performance metric for any programmable logic device is its operating speed. The suffix `-75` indicates a maximum pin-to-pin propagation delay of 7.5 ns, enabling high-performance operation for its class. This speed is complemented by the device's 3.3V core voltage (VCC) operation, making it ideal for modern low-power electronic systems. Furthermore, its I/O pins are 5V tolerant, a critical feature that allows for seamless interfacing with legacy 5V logic devices without requiring additional level-shifting circuitry, thereby simplifying board design and reducing component count.
The device features a sophisticated I/O structure. Each pin can be individually programmed for various parameters, including slew rate (slow or fast) and input/output buffer characteristics. This programmability grants designers significant control over signal integrity and power consumption. The architecture is based on a PTOP (Programmable Tile for Optimized Performance) structure, which ensures predictable timing performance that is consistent across the entire device, a significant advantage over FPGAs for certain control-oriented tasks.
The programming and in-system functionality are enhanced by Lattice's isp (in-system programmability) technology. This allows the CPLD to be reprogrammed while soldered onto the circuit board, facilitating rapid design iterations, field upgrades, and protocol changes without the need to physically remove the component. The `-10I` suffix typically denotes the industrial-grade temperature range, meaning the device is rated to operate reliably between -40°C and +85°C, catering to a broad spectrum of industrial, automotive, and communications applications.
In summary, the Lattice LC4128V-75TN100-10I is a powerful and flexible CPLD. Its combination of 128 macrocells, high-speed performance (7.5ns), 3.3V low-power operation, 5V tolerant I/Os, and in-system programmability makes it an excellent choice for a wide array of digital design tasks, from address decoding and bus interfacing to state machine control and simple data processing.
ICGOODFIND: The Lattice LC4128V-75TN100-10I is a highly integrated and performance-optimized CPLD, offering a perfect blend of density, speed, and low-power features for modern electronic system design.
Keywords: CPLD, 5V Tolerant I/O, 128 Macrocells, isp (In-System Programmable), 7.5ns Propagation Delay
