LCMXO2-7000HC-4TG144C Datasheet, Pinout, Equivalents, and Specs

The LCMXO2-7000HC-4TG144C is a versatile Programmable Logic Device (PLD) from Lattice Semiconductor's MachXO2 family. It is engineered to solve a wide array of system-level challenges, from complex glue logic and I/O expansion to power-up sequencing and interface bridging. Its key advantage lies in its non-volatile, Flash-based architecture, which provides "instant-on" functionality at power-up without the need for an external configuration memory, a common requirement for traditional SRAM-based FPGAs. This makes it an ideal choice for control-plane functions in a diverse range of applications, including industrial, communications, computing, and consumer electronics.

What is the LCMXO2-7000HC-4TG144C?

The LCMXO2-7000HC-4TG144C is a member of the MachXO2 family, which Lattice positions as "Programmable Logic Devices" that blend the best attributes of CPLDs and FPGAs. The part number itself provides a wealth of information: LCMXO2 denotes the family, 7000 indicates the logic density (specifically, 6864 4-input Look-Up Tables or LUTs), and HC signifies the High-Performance, 1.2V core variant. This variant is optimized for performance over the ultra-low-power "ZE" models.

At its core, the device is built around a fabric of programmable logic. This fabric consists of Programmable Logic Blocks (PLBs), which are clusters of LUTs and registers, interconnected by a flexible routing matrix. This architecture allows hardware engineers to implement custom digital logic circuits by describing them in a Hardware Description Language (HDL) like VHDL or Verilog. With 6864 LUTs, the LCMXO2-7000HC offers substantial capacity for implementing state machines, data path manipulation, bus controllers, and custom peripheral logic.

What truly sets the MachXO2 family apart is its non-volatile nature. Unlike SRAM-based FPGAs that are volatile and require an external boot PROM or a processor to load their configuration bitstream upon every power cycle, the LCMXO2 stores its configuration in on-chip Flash memory. This results in a device that is live and operational almost instantaneously after power is applied (in microseconds), a critical feature for system "housekeeping" tasks like power sequencing, reset generation, and monitoring. This integration also enhances system security by eliminating the external bitstream, which could be a potential point of attack for reverse engineering or cloning.

Beyond the basic logic fabric, the LCMXO2-7000HC integrates several hardened, dedicated function blocks to offload common tasks and save valuable logic resources. These Embedded Function Blocks (EFBs) include hardened I2C and SPI port controllers, and a timer/counter. By using these pre-verified blocks, designers can reduce development time and free up LUTs for custom application logic. The device also includes significant on-chip memory resources: 240 kbits of Embedded Block RAM (EBR) for larger data buffers and 54 kbits of distributed RAM for smaller, more scattered memory needs. For sophisticated clocking schemes, it incorporates two Phase-Locked Loops (PLLs) that can be used for clock multiplication, division, phase shifting, and jitter reduction.

Pinout Configuration and Packaging

The LCMXO2-7000HC-4TG144C is offered in a 144-pin Thin Quad Flat Pack (TQFP) package. The "T" in the part number signifies this package type, which is popular for its balance of pin density and ease of assembly on standard PCB manufacturing lines. The 144-pin count provides a generous number of user-configurable I/O pins, making it suitable for I/O-intensive applications.

The pins of the device can be categorized into several functional groups:

• User I/O Pins: The majority of the pins are general-purpose I/O that can be configured as inputs, outputs, or bidirectional signals. In the 144-pin package, the LCMXO2-7000HC provides up to 114 user I/Os. These are organized into banks, with each bank having its own I/O supply voltage (VCCIO).
• Power Supply Pins: Multiple pins are dedicated to power and ground to ensure stable operation. This includes VCC for the 1.2V core logic, multiple VCCIO pins for the I/O banks (supporting voltages from 1.2V to 3.3V), and numerous GND pins for return current paths. Proper decoupling for each power pin is critical.
• Dedicated Clock Inputs: The device has dedicated clock input pins (PCLK) that are routed to the internal clock distribution network and PLLs with minimal skew and delay, ensuring high-quality clocking for synchronous designs.
• Programming and Test Pins: A standard IEEE 1149.1 JTAG interface is provided for in-system programming and debugging. These pins are TCK (Test Clock), TMS (Test Mode Select), TDI (Test Data In), and TDO (Test Data Out). After configuration, these pins can typically be reclaimed as user I/O if needed.
• Special Function Pins: Certain pins may have dual functions, such as serving as inputs to the hardened I2C/SPI blocks or as outputs from the PLLs. The specific functionality is determined by the user's design configuration.

A crucial aspect of the pinout is the I/O banking system. The I/Os are grouped into banks (e.g., Bank 0, Bank 1, etc.), and each bank is powered by a corresponding VCCIO pin. This allows the device to interface with multiple components operating at different voltage standards simultaneously. For example, Bank 1 could be powered by VCCIO = 3.3V to interface with a legacy peripheral, while Bank 2 could be powered by VCCIO = 1.8V to connect to a modern processor. This flexibility is a cornerstone of the device's utility as an interface bridge.

Core Architectural Features

• Non-Volatile, Instant-On & Secure: The device integrates Flash configuration memory alongside the logic fabric. This allows it to load its configuration in microseconds upon power-up, making it ideal for first-on, last-off control plane functions. This single-chip solution improves system reliability and security by eliminating the external configuration bitstream. The on-chip Flash also supports dual-boot capabilities for fail-safe field updates.
• Flexible, High-Performance I/O: The I/O buffers are highly configurable, supporting a wide range of single-ended logic standards including LVCMOS (3.3V, 2.5V, 1.8V, 1.5V, 1.2V) and LVTTL. Each pin can be configured with programmable pull-up, pull-down, or bus-keeper resistors. The I/Os also support hot-socketing, allowing the device to be safely inserted or removed from a powered backplane without damage.
• Embedded Function Blocks (EFB): To conserve programmable logic and simplify design, the MachXO2 integrates hardened IP blocks. The EFB in the LCMXO2-7000HC includes a user-configurable block that can be set up as a hardened I2C controller, an SPI controller, or a Timer/Counter. Using these hardened blocks results in more predictable performance and lower power consumption compared to a soft implementation in LUTs.
• Abundant On-Chip Memory: The device features a flexible memory architecture. It contains 240 kbits of dedicated Embedded Block RAM (EBR), which can be configured into various widths and depths for implementing FIFOs, data buffers, or processor memory. In addition, the LUTs themselves can be configured as small distributed RAM elements, providing a total of over 54 kbits for smaller, scattered memory requirements.
• Advanced Clock Management with PLLs: Two on-chip Phase-Locked Loops (PLLs) provide sophisticated clock management capabilities. They can be used for frequency synthesis (multiplication and division), phase shifting, and clock de-skewing. This allows the device to generate all necessary internal and external clock signals from a single, low-cost reference clock, simplifying board-level clock tree design.

Specifications Parameter Table

LCMXO2-7000HC-4TG144C Equivalents, Cross Reference & Lifecycle

The MachXO2 family is a mature and widely adopted product line from Lattice, generally considered to be in an active production lifecycle. However, for mission-critical designs, it is always best practice to verify the latest status directly with the manufacturer or authorized distributors. You can Check LCMXO2-7000HC-4TG144C Inventory & Pricing for current availability.

Finding a direct, drop-in replacement for a PLD/FPGA is challenging due to proprietary architectures and toolchains. Cross-referencing to a device from another manufacturer (e.g., Intel/Altera, Xilinx/AMD) would require a complete redesign, including porting the HDL code, re-constraining the design, and re-verifying timing. The most practical alternatives are typically found within the same product family:

• LCMXO2-7000HC-5TG144C: This is a pin-compatible device with the same logic density and features, but with a slower speed grade (-5 vs. -4). It may be a suitable, lower-cost alternative if the design has significant timing margin. A full timing analysis must be performed to ensure the design still meets requirements.
• LCMXO2-4000HC-4TG144C: For designs that do not fully utilize the 7000 LUTs, this part offers a lower-density option (4320 LUTs) in the same package and speed grade. It is largely pin-compatible and can serve as a cost-reduction path, provided the design fits within the smaller logic and memory resources.

When considering any alternative, it is imperative to review the pin migration guide from Lattice and re-compile the design for the new target device to ensure functional and timing correctness.

Typical Applications & Circuit Considerations

The unique combination of instant-on, high I/O count, and integrated function blocks makes the LCMXO2-7000HC-4TG144C extremely useful in a variety of system-level roles.

Common Applications:

• System Control & "Housekeeping": Its instant-on capability is perfect for managing power-up sequences, generating system resets, monitoring power rails with its analog-capable inputs, and controlling cooling fans based on sensor inputs.
• I/O Expansion: A common use case is to expand the I/O capabilities of a resource-constrained microcontroller or microprocessor. A few I2C or SPI pins from a processor can control the 100+ I/Os on the MachXO2 to drive LEDs, scan keypads, and interface with numerous low-speed peripherals.
• Interface Bridging: The flexible I/O banks and logic fabric are ideal for creating bridges between disparate interfaces. Examples include bridging a modern SPI bus to a legacy parallel bus, converting between I2C and SMBus, or creating a custom bus protocol converter.
• Legacy Logic Consolidation: A single LCMXO2 device can replace dozens of older 74-series or 4000-series discrete logic ICs, reducing board space, lowering power consumption, and improving reliability.

Circuit Design & PCB Layout Considerations:

To ensure reliable operation, careful attention must be paid to the surrounding circuitry. The power delivery network is paramount. Both the core voltage (VCC) and each I/O bank voltage (VCCIO) must be properly decoupled. This typically involves placing a combination of low-ESR ceramic capacitors (e.g., 10µF, 1µF, and 0.1µF) as close as possible to each power and ground pin pair to provide a low-impedance path for high-frequency switching currents.

The JTAG programming interface (TCK, TMS, TDI, TDO) should be brought out to a header for development and production programming. It's good practice to include weak pull-up/pull-down resistors on these lines as recommended in the Lattice system design guidelines to prevent them from floating. For unused I/O pins, the recommended practice is to not leave them floating. They should be configured in the design software as inputs with an internal pull-down or pull-up enabled, or as unused outputs driving a constant low level, to minimize power consumption and noise susceptibility. The entire Browse MachXO2 Series offers a range of densities and packages to fit various design constraints.

Video Demonstration

Frequently Asked Questions (LCMXO2-7000HC-4TG144C FAQ)

What does the part number LCMXO2-7000HC-4TG144C signify?

The part number is a code for its key features. "LCMXO2" is the product family. "7000" refers to the logic density, approximately 6864 LUTs. "HC" indicates it's a High-Performance, 1.2V core version. "-4" is the speed grade, with lower numbers being faster. "T" means TQFP package, "G" means it is Pb-Free/RoHS compliant, "144" is the pin count, and "C" denotes the commercial operating temperature range (0°C to 85°C junction temperature).

Is the LCMXO2-7000HC-4TG144C an FPGA or a CPLD?

It's best described as a hybrid device that Lattice calls a Programmable Logic Device (PLD). It has the non-volatile, instant-on characteristic and block-based architecture of a Complex Programmable Logic Device (CPLD). However, it also has the higher logic density, granular routing, block RAM, and PLLs that are characteristic of a Field-Programmable Gate Array (FPGA). This blend makes it exceptionally versatile for control-path applications.

What software is used to program this device?

The LCMXO2-7000HC-4TG144C is programmed using Lattice's proprietary design software, Lattice Diamond. This is a comprehensive tool suite that supports the entire design flow, from HDL (VHDL, Verilog) entry and synthesis to place-and-route, timing analysis, and bitstream generation. The software also includes tools for simulating designs and programming the device in-system via a JTAG cable.

What is the difference between the core voltage (VCC) and I/O voltage (VCCIO)?

The core voltage (VCC) powers the internal logic fabric, LUTs, registers, and block RAM. For the "HC" variant, this is a fixed 1.2V. The I/O voltage (VCCIO) powers the output drivers and input buffers of the I/O pins. The device has multiple VCCIO pins, each powering a specific bank of I/Os, and they can be set to different voltages (e.g., 1.8V, 2.5V, 3.3V) to allow the device to interface directly with other components at various logic levels.

Do I need an external configuration PROM for the LCMXO2-7000HC-4TG144C?

No, an external configuration device is not required. The LCMXO2-7000HC-4TG144C contains on-chip non-volatile Flash memory that stores the configuration bitstream. When power is applied, the device automatically configures itself from this internal memory, resulting in "instant-on" operation. This simplifies board design, reduces component count, and enhances system security.