Lattice LC4064V-75T100I: A Comprehensive Technical Overview of the Low-Power CPLD

In the realm of digital logic design, Complex Programmable Logic Devices (CPLDs) remain a cornerstone for "glue logic," system configuration, and power-sensitive control applications. Among these, the Lattice LC4064V-75T100I stands out as a quintessential example of a high-performance, yet remarkably low-power CPLD solution. This article provides a detailed technical examination of this specific device, exploring its architecture, key features, and target applications.

Architectural Foundation: The Logic Block Array

At the heart of the LC4064V-75T100I lies Lattice's optimized architecture. The device features 64 macrocells, organized into a flexible array of Logic Blocks. Each macrocell can be configured to implement a wide range of combinatorial and sequential logic functions. A key strength of this architecture is its deterministic, pin-to-pin timing model. Unlike FPGAs, whose interconnect delays can vary, the CPLD's global interconnect matrix ensures that signal delays are consistent and predictable, simplifying the design process and eliminating the need for complex timing closure.

Core Technical Specifications and Performance

The part number itself encodes critical information: '4064' denotes the family and macrocell count, 'V' signifies low-voltage operation, '-75' indicates a pin-to-pin delay of 7.5ns, and 'T100' specifies the 100-pin Thin Quad Flat Pack (TQFP) package.

Density: 64 Macrocells.

Speed: Maximum operating frequency exceeds 100 MHz, with a guaranteed tPD (Propagation Delay) of 7.5ns.

I/O: 80 user-programmable I/O pins, offering extensive connectivity.

Voltage: Operates from a single 3.3V power supply, with I/Os compatible with 5V, 3.3V, and 2.5V logic levels.

Power Consumption: This is a defining characteristic. Fabricated on an advanced low-power process, the device features zero-power suspend mode and ultra-low standby current, making it ideal for battery-operated or power-conscious systems.

In-System Programmability and Design Support

The LC4064V-75T100I is fully reprogrammable via the industry-standard JTAG (IEEE 1149.1) interface. This allows for rapid prototyping and easy field upgrades without removing the device from the circuit board. Designers can leverage Lattice's ispLEVER Classic design software (or the newer Lattice Radiant), which provides a complete suite of tools for design entry, synthesis, place-and-route, and programming.

Target Application Domains

The combination of low power, predictable timing, and sufficient logic density makes this CPLD exceptionally versatile. Its primary applications include:

Power Management Sequencing: Controlling the power-up and power-down sequence of various system components.

Interface Bridging and Protocol Translation: Serving as a glue logic intermediary between processors and peripherals using different communication standards (e.g., SPI to I2C, GPIO expansion).

System Configuration: Loading configuration data for FPGAs and ASSPs upon system startup.

Consumer and Portable Electronics: Where minimizing power dissipation is a critical design constraint.

ICGOOODFIND: The Lattice LC4064V-75T100I embodies the enduring value of the CPLD form factor. It delivers a robust blend of predictable performance, high I/O-to-logic ratio, and exceptional power efficiency. For engineers seeking a reliable, low-risk solution for control logic, interfacing, and power management in modern electronic systems, this device remains a compelling and highly relevant choice.

Keywords: Low-Power CPLD, Deterministic Timing, JTAG Programming, Glue Logic, 3.3V Operation.