Lattice LC4128V-75TN100C: A Comprehensive Technical Overview of the 3V CPLD

The Lattice LC4128V-75TN100C stands as a quintessential component within the realm of Complex Programmable Logic Devices (CPLDs). Designed for a broad spectrum of applications, from communication interfaces to industrial control systems, this device combines a robust architecture with the power efficiency of a 3.3V core voltage supply. This technical overview delves into its key specifications, architecture, and target applications, highlighting why it remains a relevant choice for modern digital design.

At the core of the LC4128V-75TN100C is a high-density logic structure. The "128" in its nomenclature signifies its capacity, containing 128 macrocells. These macrocells are grouped into four Function Blocks, each with 36 macrocells, interconnected by a centralized Programmable Interconnect Array (PIA). This architecture ensures predictable, fast timing performance across the entire device, a characteristic advantage of CPLDs over FPGAs for glue logic and control-oriented tasks.

Performance is a critical factor for any logic device. The -75 speed grade denotes a pin-to-pin logic propagation delay of 7.5ns, enabling its operation at system speeds well above 100 MHz. This makes it suitable for implementing high-speed state machines, address decoders, and bus interfaces. The device is in-circuit programmable and reprogrammable via a JTAG (IEEE 1149.1) interface, facilitating rapid prototyping and easy field upgrades.

The package type, TN100C, indicates a 100-pin Thin Plastic Quad Flat Pack (TQFP). This low-profile package is ideal for space-constrained applications. The device offers 80 user I/O pins, providing ample connectivity for interfacing with processors, memory, and peripheral devices. These I/O pins are compliant with 3.3V LVCMOS and LVTTL standards and can also interface with 5V TTL signals, offering significant flexibility in mixed-voltage systems.

A standout feature of this 3V CPLD family is its low power consumption. Operating from a 3.3V core voltage, it significantly reduces overall system power compared to 5V CPLDs. Furthermore, it employs a zero-power ISP mode and advanced CMOS technology to minimize standby current, making it an excellent choice for battery-operated or power-sensitive portable equipment.

Target applications for the LC4128V-75TN100C are extensive. It is perfectly suited for:

System Integration: Replacing multiple discrete logic ICs to reduce board space and increase reliability.

Protocol Bridging: Interfacing between different communication standards like SPI, I²C, and UART.

Power Management: Implementing complex sequencing and control for multi-rail power systems.

Data Path Control: Acting as a glue logic controller in telecommunications and networking hardware.

ICGOODFIND: The Lattice LC4128V-75TN100C emerges as a highly capable and versatile 3.3V CPLD. Its balanced combination of 128 macrocells, high-speed performance (7.5ns), 80 I/O pins in a compact TQFP package, and low-power operation solidifies its position as an optimal solution for a wide array of digital logic consolidation and control tasks in modern electronic design.

Keywords: CPLD, 3.3V Core Voltage, 128 Macrocells, 7.5ns Propagation Delay, JTAG Programmability