Lattice LC4128V-5TN100C: 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 plane management. Among these, the Lattice LC4128V-5TN100C 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-5TN100C is built on a mature, high-speed, 3.3V in-system programmable architecture. The "128" in its name denotes its macrocell count, signifying a medium-density logic capacity ideal for integrating numerous discrete logic components into a single, compact package. This integration significantly reduces board space, lowers overall system power consumption, and enhances design reliability.

At the heart of this CPLD lies its non-volatile E²CMOS® technology. This is a critical feature, as it allows the device to retain its programmed configuration upon power-down without requiring an external boot PROM. This makes it perfect for critical system initialization tasks that must occur immediately at power-up.

The device's internal structure is organized into a Programmable Functional Unit (PFU) array. Each PFU contains 16 macrocells, offering a flexible mix of combinatorial and registered logic functions. The interconnect resources provide a deterministic, fast pin-to-pin timing, which is a hallmark advantage of CPLDs over FPGAs for simple, speed-critical control applications. The specified `-5` speed grade indicates a maximum pin-to-pin delay of 5.0 ns, enabling high-performance operation.

The package type, TN100, refers to a 100-pin Thin Plastic Quad Flat Pack (TQFP). This surface-mount package offers a practical balance between pin count and physical footprint, making it suitable for a wide range of space-constrained applications. The `C` suffix confirms it is qualified for commercial temperature range (0°C to +70°C).

Key features include:

128 Macrocells, providing substantial logic density.

5.0 ns maximum pin-to-pin delay, ensuring high-speed signal processing.

3.3V core voltage with 5.0V tolerant I/Os, allowing for easy interfacing with both 3.3V and 5.0V systems.

In-System Programmable (ISP) via IEEE 1149.1 (JTAG) interface, facilitating easy field upgrades and prototyping.

High I/O to macrocell ratio, offering ample connectivity for its logic capacity.

Typical applications for the LC4128V-5TN100C are diverse, ranging from address decoding and bus interfacing in computing systems to state machine control and data path management in telecommunications and industrial equipment. Its reliability and deterministic timing make it a trusted choice for these foundational digital tasks.

ICGOODFIND: The Lattice LC4128V-5TN100C is a highly capable and reliable CPLD, offering an optimal blend of logic density, high-speed performance, and non-volatile configuration. Its well-established architecture and 3.3V operation make it a enduring and practical solution for designers needing robust system integration and control.

Keywords: CPLD, In-System Programmable, Non-Volatile, Macrocell, JTAG