Lattice LC4128V75T100-10I: 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 LC4128V75T100-10I stands out as a robust and versatile solution. This article provides a detailed technical examination of this specific CPLD, its architecture, key features, and target applications.

The LC4128V is part of Lattice Semiconductor's high-performance, low-power ispMACH® 4000ZE CPLD family. The device nomenclature breaks down as follows: 'LC4128V' indicates the family and macrocell count, '75' signifies the number of I/O pins, 'T100' denotes the 100-pin Thin Quad Flat Pack (TQFP) package, and '10I' specifies the industrial temperature grade (-40°C to +100°C) and its In-System Programmable (ISP) capability.

At the heart of this device are 128 macrocells, organized into four Function Blocks. Each macrocell can be configured for combinatorial or registered logic operations, providing a flexible fabric for implementing a wide range of digital functions. The device features 7.5 ns maximum pin-to-pin delay, enabling its use in systems requiring rapid signal processing and deterministic timing. Despite this speed, it is engineered for very low power consumption, a hallmark of the 4000ZE series, making it suitable for power-sensitive and battery-operated applications.

A key advantage of the ispMACH 4000ZE architecture is its non-volatile E²CMOS® technology. This means the device retains its programmed configuration upon power-down, eliminating the need for an external boot PROM. The In-System Programmability (ISP) is facilitated through a standard JTAG (IEEE 1149.1) interface. This allows for incredibly efficient design cycles and field upgrades, as the CPLD can be reprogrammed while soldered onto the final circuit board.

With 75 user I/O pins, the LC4128V75T100-10I offers a substantial number of interfaces to connect with other system components like memories, microcontrollers, ASICs, and data buses. These I/Os are compliant with various standards, including LVCMOS 3.3V/2.5V/1.8V and LVTTL, ensuring broad compatibility within modern mixed-voltage system environments.

Target applications for this CPLD are extensive. It is perfectly suited for:

Address Decoding and Bus Interface in microprocessor systems.

System Configuration and Control, managing power-up sequences and reset logic.

Data Routing and Bridging between different logic families or interfaces.

Function Integration, consolidating numerous discrete logic ICs into a single, reliable chip to reduce board space and component count.

ICGOODFIND: The Lattice LC4128V75T100-10I is a highly integrated, fast, and power-efficient CPLD. Its combination of 128 macrocells, 75 I/Os, high-speed performance, and ISP capability makes it an exceptional choice for designers seeking to simplify board design, enhance reliability, and accelerate time-to-market for a wide array of digital systems in industrial, communications, and consumer markets.

Keywords: CPLD, In-System Programmability (ISP), Macrocell, Non-volatile, Low Power Consumption