on July 10th 1,681

LC5768MC-75F256C CPLD: Features, Specs, Advantages and Applications

This guide explains the LC5768MC-75F256C, a small but powerful chip made by Lattice Semiconductor. It shows what the chip does, how it works, how to program it, and where it can be used. If you're looking for a chip that handles logic tasks, uses low power, and works in many devices, this guide will help you understand why the LC5768MC-75F256C is a good option.

Catalog

What is the LC5768MC-75F256C?

The LC5768MC-75F256C is a high-performance Complex Programmable Logic Device (CPLD), part of the ispXPLD 5000MC family. This device is designed around a 1.8V core architecture and provides robust logic density, integrating 768 macrocells. As a member of the 5000MC series, it represents Lattice’s advanced CPLD solutions that offer reliable timing control, efficient logic implementation, and low power operation, all optimized for embedded and high-speed digital systems. The ispXPLD 5000MC family enhances the capabilities of traditional CPLDs by introducing Multi-Function Blocks (MFBs) and flexible I/O support, making the LC5768MC-75F256C a solid choice for scalable logic integration. With its proven reliability and architecture tailored for deterministic performance, this device serves as a dependable building block in digital design.

Looking for LC5768MC-75F256C? Contact us to check current stock, lead time, and pricing.

LC5768MC-75F256C Features

• 768 Macrocells (MFB-Based Architecture)

The device integrates 768 macrocells organized in advanced Multi-Function Blocks (MFBs), supporting high-density logic with embedded arithmetic and memory capabilities. These MFBs allow flexible configuration for logic, dual-port SRAM, FIFO, and CAM functions.

• 1.8V Core Voltage (MC Variant)

This MC-series variant operates with a 1.8V core, offering lower power consumption for portable and high-efficiency designs. Despite the low voltage, it maintains robust performance and logic density.

• 7.5 ns Propagation Delay (Speed Grade -75)

It achieves a maximum pin-to-pin propagation delay of just 7.5 nanoseconds, making it suitable for moderate- to high-speed digital applications. The -75 speed grade balances power and speed in embedded systems.

• 193 Programmable I/O Pins

The chip offers 193 I/O pins that support multiple voltage standards and protocols. These pins are fully programmable and allow flexible interfacing with other logic or analog devices.

• SuperWIDE Logic Support (Up to 136 Inputs per Block)

Each MFB supports very wide logic functions with up to 136 input signals, enabling complex combinational logic in fewer logic levels. This reduces propagation delay and simplifies logic synthesis.

• Embedded Dual-Port SRAM, FIFO, and Ternary CAM Support

MFBs are configurable to act as SRAM (single/dual port), FIFOs, or ternary Content Addressable Memory. This flexibility enables memory-rich logic design in a compact CPLD.

• On-Chip PLL (sysCLOCK™)

The built-in PLL supports clock multiplication/division from 1× to 32×, phase shifting, and external feedback. It helps manage timing and skew across high-speed synchronous systems.

• Wide I/O Standard Support (sysIO™)

The I/O blocks support a broad range of signaling standards including LVCMOS, LVTTL, SSTL, HSTL, GTL+, LVDS, and LVPECL. This enables mixed-voltage and differential signaling on a single device.

• In-System Programmability (ispXP™)

The device supports in-system programming through IEEE 1532 or sysCONFIG interface. It can be reprogrammed on the board without removing it, enabling design updates and field reconfiguration.

• Boundary Scan Test (IEEE 1149.1 Compliant)

Full JTAG boundary scan support allows robust board-level testing and debugging. This ensures compliance with modern test requirements and simplifies validation in production.

• 5V Tolerant I/O

Despite a 1.8V core, the I/O banks are tolerant of 5V signals, supporting legacy voltage interfaces. This improves compatibility with older systems and mixed-voltage environments.

ispXPLD 5000MX/5000MC Block Diagram

The block diagram of the LC5768MC-75F256C in the ispXPLD 5000MX/5000MC family highlights how the chip is structured to handle programmable logic tasks. At the center is the Global Routing Pool (GRP), which acts as the main connection hub, linking various logic and functional blocks so signals can move efficiently throughout the device. On either side of the GRP are two Phase-Locked Loops (PLL0 and PLL1), part of the sysCLOCK system. These generate precise and adjustable clock signals that help maintain timing accuracy for high-speed operations across the chip.

Around the GRP and PLLs are four sysIO Banks. Each bank contains Configurable System Arrays (CSAs) and Multi-Function Blocks (MFBs). The CSAs handle basic logic processing, while the MFBs support more advanced features like math operations and memory functions. This arrangement gives the device strong I/O flexibility and makes it easier to scale for different applications. Power and clock connections are also clearly shown in the diagram. Multiple VCC, VREF, and GND pins are distributed to maintain stable power across the chip. Global clock inputs (GCLK0 to GCLK3) allow external clocks to feed into the system and work with the GRP and PLLs.

Multi-Function Block (MFB) Diagram

The Multi-Function Block (MFB) in the LC5768MC-75F256C ispXPLD 5000MX/5000MC combines both memory and logic functions to support flexible design needs. It supports several memory types, including True Dual Port RAM (8,192 bits), Pseudo Dual Port RAM, FIFO, and Single Port RAM (each up to 16,384 bits), plus Ternary CAM (128×48). These memory options make the MFB useful for data buffering, temporary storage, and fast data lookup.

The MFB also has strong logic capabilities. It includes a 68-input by 164-product term array and 32 Macrocells, allowing it to perform complex logic operations. It uses multiple clock inputs (CLK0 to CLK3) and a reset signal to control timing and operations. To expand functionality, Cascade In/Out ports allow MFBs to be connected together across blocks. The QSA (Quad System Array) interface connects the MFB to I/O banks for fast communication with external systems. In short, the MFB is a powerful, flexible unit that handles both memory and logic tasks, helping the device perform well in embedded and high-speed applications.

LC5768MC-75F256C Specifications

Type	Parameter
Manufacturer	Lattice Semiconductor Corporation
Series	ispXPLD® 5000
Packaging	Bulk
Part Status	Active
Programmable Type	In System Programmable
Delay Time tpd(1) Max	7.5 ns
Voltage Supply - Internal	1.65V ~ 1.95V
Number of Logic Elements/Blocks	24
Number of Macrocells	768
Number of I/O	193
Operating Temperature	0°C ~ 90°C (TJ)
Mounting Type	Surface Mount
Package / Case	256-BGA
Supplier Device Package	256-FPBGA (17x17)

LC5768MC-75F256C Applications

1. Telecommunications and Networking

The LC5768MC-75F256C is ideal for use in base stations, telecom switches, and optical network units, where high-speed and deterministic logic are needed. Its embedded memory and multi-voltage I/O support enable protocol processing, data framing, and low-latency control tasks.

2. Data Communication and Storage

This CPLD is well-suited for routers, RAID controllers, and disk-array systems that require efficient data handling and fast signal processing. Its dual-port SRAM and FIFO support provide the buffering and flow control needed in high-throughput environments.

3. Protocol Processors and Bus Interfaces

With predictable timing and high-density logic resources, the LC5768MC excels in implementing bus bridges, backplane interfaces, and protocol decoders. It enables quick logic responses and supports seamless integration with multiple signaling standards.

4. Industrial and IoT Control Systems

In industrial automation, the device is used for monitoring, machine control, and logic sequencing. Its instant-on capability, low power draw, and robust I/O features make it suitable for IoT nodes and embedded controllers.

5. Consumer and Medical Electronics

The compact footprint and rich logic-mixed-memory capabilities make this CPLD valuable in portable medical instruments and consumer electronics. It handles system control, interface management, and power sequencing in size-constrained and energy-sensitive designs.

LC5768MC-75F256C Similar Parts

Feature	LC5768MC-75F256C	LC5768MV-75F484C	LC5768MV-75FN256C	LC5768MV-5F484C
Family	ispXPLD 5000MC	ispXPLD 5000MV	ispXPLD 5000MV	ispXPLD 5000MV
Core Voltage	1.8 V	3.3 V	3.3 V	3.3 V
Macrocells	768	768	768	768
Max Frequency	~150 MHz	~150 MHz	~150 MHz	~200–250 MHz
Propagation Delay (tpd)	7.5 ns	7.5 ns	7.5 ns	5 ns
Package Type	256-ball BGA	484-ball BGA	256-ball BGA	484-ball BGA
Package Code	F256C	F484C	FN256C	F484C
I/O Count	193	317	193	317
In-System Programmable	Yes	Yes	Yes	Yes
Embedded Memory Support	Yes (SRAM/FIFO/CAM)	Yes	Yes	Yes
JTAG (IEEE 1149.1)	Supported	Supported	Supported	Supported
Instant-On	Yes	Yes	Yes	Yes
Application	Low-power, dense logic	High I/O, general CPLD	Compact 3.3 V logic	High-speed 3.3 V logic

LC5768MC-75F256C Programming Steps

1. Prepare Your Board and Tools

Connect the LC5768MC-75F256C to your PC using a compatible programming cable such as the Lattice HW-USBN-2B. Make sure JTAG lines are properly routed and termination resistors (e.g., 4.7kΩ on TCK) are in place to ensure stable communication.

2. Generate the Programming File

Use Lattice Diamond or ispVM software to compile your design and export a JEDEC (.jed) programming file. This file contains the complete bitstream that will be written into the CPLD’s configuration memory.

3. Launch the Programming Software

Open the Diamond Programmer or ispVM System tool on your PC and verify that your programmer is properly detected. Select the LC5768MC-75F256C device from the list to begin setup.

4. Execute In-System Programming (ISP)

Use the JTAG (IEEE 1532) interface to load the JEDEC file directly into the device while it remains mounted on the board. The bitstream is stored in internal non-volatile memory, enabling instant-on configuration at startup.

5. Verify and Secure Configuration

After programming, perform a read-back operation to confirm the configuration was successful. If required, activate the security fuse to lock the device and prevent unauthorized reprogramming or reverse engineering.

6. Configure and Reset the Device

Once programming is complete, the device may automatically restart, or you can toggle its PROGRAM or INIT pins to force a reload. The CPLD will then operate based on the newly applied configuration with deterministic startup timing.

7. Optional: Field Reprogramming or Updates

You can reprogram the LC5768MC-75F256C in the field using the same JTAG interface for updates or corrections. Additionally, its sysCONFIG™ interface allows partial reconfiguration without full power cycling in advanced applications.

LC5768MC-75F256C Advantages

• Lower Power Operation for Portable and Embedded Systems

Compared to many traditional CPLDs with higher core voltages, the LC5768MC-75F256C’s low-power 1.8V core helps reduce overall system power consumption. This makes it attractive for battery-operated or heat-sensitive applications where thermal budget and energy efficiency matter.

• Instant-On Capability

Unlike many FPGAs or larger programmable devices that require external configuration at every startup, this CPLD offers instant-on behavior, allowing to avoid delays or the need for external flash memory. This leads to faster time-to-operation and greater reliability.

• More Predictable Timing vs. FPGAs

The deterministic timing behavior of this CPLD, especially under heavy logic or I/O loads, gives better control compared to the often-variable timing of larger FPGAs. This makes it more suitable for time-critical applications like digital control loops, communication interfaces, and synchronized logic systems.

• Efficient Learning Curve and Design Tool Ecosystem

For transitioning from 22V10s, older PAL/GALs, or simple PLDs, this device offers a gentle learning curve via Lattice’s intuitive design tools like Diamond and ispVM. Many benefit from faster prototyping and fewer integration headaches.

LC5768MC-75F256C Packaging Dimensions

• Package Type: Fine-pitch Ball Grid Array

• Pin Count: 256 balls

• Package Size: 17 mm × 17 mm

• Package Height: Approximately 1.2 mm

• Ball Pitch: Standard fine-pitch usually 0.8 mm

LC5768MC-75F256C Manufacturer

The LC5768MC-75F256C is manufactured by Lattice Semiconductor Corporation, a U.S.-based company recognized for its expertise in low-power, small-footprint programmable logic devices. Founded in 1983 and headquartered in Hillsboro, Oregon, Lattice focuses on delivering FPGAs, CPLDs, and related development tools tailored for applications in communications, computing, industrial, automotive, and consumer markets. The company is known for long product lifecycles, broad design tool support, and reliable in-system programmability across its device families. As the original developer and supplier of the ispXPLD® 5000MC family, Lattice ensures robust technical documentation, software support, and availability through authorized distributors and long-term lifecycle partners.

Conclusion

The LC5768MC-75F256C is a smart and reliable CPLD that offers strong logic and memory functions in one compact chip. It uses little power, starts up instantly, and works with many different signal types. With 768 macrocells, built-in memory, fast clocking, and flexible input/output options, it fits well in products like telecom devices, industrial machines, storage systems, and consumer electronics. Its easy programming, strong performance, and support for updates make it a helpful solution for both new designs and upgrades.