Lattice LC4128V-75TN128-10I: 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. The Lattice Semiconductor LC4128V-75TN128-10I stands as a prominent representative of this category, offering a robust blend of density, performance, and power efficiency. This article provides a detailed technical examination of this specific CPLD.

The device's nomenclature reveals its key specifications. The "LC4128V" indicates it is part of Lattice's high-performance, low-power ispMACH 4000V CPLD family. The "128" denotes the macrocell count, a primary measure of its logic capacity. This makes it suitable for integrating numerous discrete logic components, state machines, and interface bridging functions into a single, compact package.

The "-75TN128" segment specifies the package and pin count. It is housed in a Thin Quad Flat Pack (TQFP) with 128 pins. This surface-mount package offers a compelling balance of a relatively small footprint and a sufficient number of I/O for moderately complex tasks, making it ideal for space-constrained PCB designs.

A critical performance metric is the "-10I" suffix, which signifies the device's speed grade. This CPLD features a maximum pin-to-pin delay of 10 ns, enabling it to operate at system speeds up to 100 MHz. This performance level is more than adequate for handling control logic, bus interfacing (e.g., PCI, SPI, I2C), and signal synchronization in a wide array of consumer, industrial, and communication systems.

Architecturally, the LC4128V is built around a proven Programmable Function Unit (PFU) structure. Its 128 macrocells are arranged in 8 logic blocks, interconnected by a deterministic Global Routing Pool (GRP). This architecture ensures predictable timing performance, a significant advantage over FPGAs for control-oriented applications where timing consistency is paramount.

A defining feature of this family is its low power consumption. Operating from a 3.3V core voltage with 5V tolerant I/Os, it utilizes a advanced CMOS process to achieve very low standby and dynamic power. This makes it an excellent choice for portable and battery-operated devices.

Furthermore, the device supports In-System Programmability (ISP) via a standard JTAG (IEEE 1149.1) interface. This allows for rapid design iterations and field upgrades without removing the chip from the circuit board, drastically reducing development time and cost.

ICGOOODFIND: The Lattice LC4128V-75TN128-10I is a highly capable CPLD that excels in integrating glue logic, providing predictable timing performance, and maintaining exceptionally low power consumption. Its 128-macrocell capacity, 100MHz operating frequency, and 128-pin TQFP package position it as a versatile and reliable solution for a vast spectrum of digital control and logic consolidation tasks in modern electronic systems.

Keywords: CPLD, Low Power, In-System Programmability (ISP), Macrocell, TQFP Package