Lattice LC4064ZC-75TN48C: 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," bus interfacing, and power-conscious control applications. The Lattice Semiconductor LC4064ZC-75TN48C stands as a prominent example, engineered to deliver a robust combination of density, performance, and remarkably low power consumption. This article provides a detailed technical examination of this specific CPLD variant.

At its core, the LC4064ZC is part of Lattice's high-performance, low-voltage ispMACH® 4000ZE CPLD family. The "64" denotes its macrocell count, offering a substantial logic capacity for implementing complex state machines and integrating multiple TTL or SSI logic devices into a single, compact package. Fabricated on an advanced low-power CMOS process, this device is optimized for portable, battery-operated, and thermally sensitive systems where every milliwatt matters.

A key architectural feature is its non-volatile, in-system programmable (ISP) nature. Utilizing IEEE 1532 compliant circuitry, the device can be reprogrammed on the board via a standard 4-pin JTAG (Joint Test Action Group) interface. This eliminates the need for physical removal for firmware updates, streamlining development cycles and field upgrades. The non-volatile configuration memory ensures instant-on operation upon power-up, with no external boot PROM required.

The device's internal structure is organized into multiple Programmable Function Blocks (PFBs), each containing 16 macrocells. This FastCONNECT II switch matrix provides a highly routable and predictable interconnect scheme, ensuring that performance remains consistent regardless of design changes. The macrocells themselves are highly flexible, capable of being configured for combinatorial or registered logic operations with programmable clock and reset controls.

Performance is a critical differentiator. The "-75" speed grade indicates a pin-to-pin logic delay of 7.5 ns maximum, enabling its use in systems with demanding timing requirements. Despite this speed, the device maintains its low-power characteristics, operating from a 1.8V core voltage supply. The 3.3V-capable I/O banks offer compatibility with a wide range of other system components while supporting various logic standards like LVCMOS and LVTTL.

The "TN48C" suffix specifies the package: a 6x6 mm, 48-pin Thin Quad Flat Pack (TQFP). This small form factor is ideal for space-constrained PCB designs. The package offers 38 user I/O pins, each with programmable slew rate and bus-keeper options to optimize signal integrity and reduce board-level noise.

ICGOOODFIND: The Lattice LC4064ZC-75TN48C emerges as an exceptional solution for designers seeking a balance of capacity, speed, and ultra-low power consumption. Its non-volatile, ISP-capable architecture, coupled with a small footprint and 1.8V core operation, makes it a versatile and reliable choice for modern control applications in consumer, communications, and industrial markets.

Keywords: Low-Power CPLD, In-System Programmable (ISP), 1.8V Core Voltage, 7.5ns Propagation Delay, 48-pin TQFP.