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Home Products Integrated Circuits (ICs)Embedded - CPLDs (Complex Programmable Logic Devices)~~LC4256ZE-7TN100C~~

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LC4256ZE-7TN100C - Lattice Semiconductor Corporation

Name: Lattice Semiconductor Corporation LC4256ZE-7TN100C
Brand: Lattice Semiconductor Corporation
SKU: LC4256ZE-7TN100C
Price: 5.11 USD
Availability: InStock
Rating: 5 (10 reviews)

Manufacturer Part Number: LC4256ZE-7TN100C

Manufacturer: Lattice Semiconductor

Allelco Part Number: 32D-LC4256ZE-7TN100C

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 12,996 pcs available, New & Original

Parts Description: IC CPLD 256MC 7.5NS 100TQFP

Package: 100-TQFP (14x14)

Data sheet: LC4256ZE-7TN100.pdf

Datasheets
Cylindrical Battery Holders.pdf

Getting Started Guide
Product Selector Guide.pdf

Manuals
2.73KHz.pdf

RoHs Status: ROHS3 Compliant

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Specifications

LC4256ZE-7TN100C Tech Specifications
Lattice Semiconductor Corporation - LC4256ZE-7TN100C technical specifications, attributes, parameters and parts with similar specifications to Lattice Semiconductor Corporation - LC4256ZE-7TN100C

Product Attribute	Attribute Value
Manufacturer	Lattice Semiconductor
Voltage Supply - Internal	1.7V ~ 1.9V
Supplier Device Package	100-TQFP (14x14)
Series	ispMACH® 4000ZE
Programmable Type	In System Programmable
Package / Case	100-LQFP
Package	Tray

Product Attribute	Attribute Value
Operating Temperature	0°C ~ 90°C (TJ)
Number of Macrocells	256
Number of Logic Elements/Blocks	16
Number of I/O	64
Mounting Type	Surface Mount
Delay Time tpd(1) Max	7.5 ns
Base Product Number	LC4256

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

LC4256ZE-7TN100C (1)

Manufacturer Part Number

LC4256ZE-7TN100C

Manufacturer

Lattice Semiconductor

Introduction

The LC4256ZE-7TN100C is a high-performance, in-system programmable Complex Programmable Logic Device (CPLD) from Lattice Semiconductor's ispMACH® 4000ZE series, housed in a 100-LQFP package.

Product Features and Performance

In-system Programmable

Supports 256 macrocells and 16 logic blocks

64 available I/O pins

Operating temperature range from 0°C to 90°C

Maximum delay time of 7.5 ns

Low voltage supply range from 1.7V to 1.9V

Product Advantages

High integration of logic elements reduces overall system cost

Low power consumption enhancing device longevity and reliability under varying environmental conditions

Key Technical Parameters

Number of Logic Elements/Blocks: 16

Number of Macrocells: 256

Number of I/O: 64

Voltage Supply - Internal: 1.7V ~ 1.9V

Delay Time tpd(1) Max: 7.5 ns

Quality and Safety Features

Robust surface mount package (100-LQFP)

Operates reliably within an industrial temperature range of 0°C to 90°C

Compatibility

Compatible with surface mount technology for ease of assembly on printed circuit boards

Application Areas

Ideal for automotive, telecommunications, data processing, industrial controls, and security systems

Product Lifecycle

Currently active with ongoing manufacturer support

Future replacement or upgrade options available

Several Key Reasons to Choose This Product

Low power operation and in-system programmability offer flexibility and extended product life

High I/O pin count and macrocell count allow for versatile and complex logic design capabilities

Supported by Lattice design and development tools ensuring ease of integration and implementation

Optimal for high-performance industrial applications due to robust temperature and voltage specifications

Trusted manufacturer with a strong reputation in CPLD products

Frequently Asked Questions(FAQ)

How does the LC4256ZE-7TN100C’s propagation delay of 7.5 ns impact timing closure in high-speed control loops, and what design constraints might arise from this specification?: The 7.5 ns maximum propagation delay of the LC4256ZE-7TN100C places it in the ultra-low latency category for CPLDs, enabling it to support control loops with cycle times below 100 ns. However, designers must account for signal routing skew across the 64 I/O pins and ensure that clock-to-output delays do not exceed system timing budgets when interfacing with synchronous FPGAs or microcontrollers. In applications such as motor control or power management, this tight timing window requires careful placement and constraint-based synthesis to avoid metastability or setup/hold violations.

Can the LC4256ZE-7TN100C be used reliably in industrial environments where ambient temperatures reach up to 70°C, given its junction temperature range is specified from 0°C to 90°C?: Yes, the LC4256ZE-7TN100C can operate reliably in typical industrial settings up to 70°C ambient, provided adequate thermal management is implemented. Since the maximum junction temperature (TJ) is 90°C, a reasonable power dissipation combined with proper PCB copper area and airflow ensures TJ remains well below the limit. At typical operating voltages of 1.8V and moderate logic utilization (e.g., <60% macrocell usage), power consumption stays under 30 mW, resulting in junction temperatures likely below 75°C under normal airflow conditions.

What are the key differences between using the LC4256ZE-7TN100C and an equivalent FPGA for glue logic in a microcontroller-based system?: The LC4256ZE-7TN100C offers deterministic timing, lower static power, and simpler configuration than an FPGA like a Xilinx Spartan series, making it ideal for fixed-function glue logic such as UART bridging, bus arbitration, or register buffering. Unlike FPGAs, it lacks block RAM and DSP slices, so it cannot handle complex algorithmic tasks. For systems requiring only modest logic expansion around a host MCU—such as address decoding or protocol translation—the CPLD provides faster bring-up, easier timing analysis, and reduced BOM cost compared to full FPGA solutions.

How should PCB layout considerations change when integrating the LC4256ZE-7TN100C into a compact IoT device with limited board space?: When mounting the LC4256ZE-7TN100C in a space-constrained IoT design, prioritize short, matched-length traces to minimize skew on clock and critical data lines, especially since the 7.5 ns delay demands precise synchronization. The 100-TQFP package occupies a 14x14 mm footprint, so thermal vias beneath the IC help dissipate heat despite low power consumption. Decoupling capacitors must be placed within 2 mm of each VCC pin due to the narrow supply voltage tolerance (1.7–1.9V), which makes the device sensitive to noise-induced glitches.

Is it possible to reprogram the LC4256ZE-7TN100C during system operation without disrupting other components?: Yes, the LC4256ZE-7TN100C supports in-system programming (ISP) via JTAG, allowing firmware updates during runtime without removing the device. However, care must be taken to isolate JTAG signals from noisy digital nets and ensure stable 1.8V supply during programming. Simultaneous use of ISP while active logic is running can cause brief glitches if not managed through software-controlled reset sequences or tri-state buffering on shared I/O lines.

How does the Moisture Sensitivity Level (MSL) rating of 3 for the LC4256ZE-7TN100C affect handling procedures during assembly?: As an MSL 3 component with a floor life of 168 hours at 30°C/60% RH, the LC4256ZE-7TN100C requires baking if exposed beyond this period before soldering. This applies particularly in high-volume manufacturing where lead-free reflow profiles may accelerate moisture absorption. Manufacturers must track bake cycles and store parts in dry cabinets post-opening. Failure to comply risks popcorning during reflow, potentially damaging the 100-pin TQFP body or causing internal delamination.

What trade-offs exist between utilizing all 256 macrocells versus reserving some for future feature expansion in a product using the LC4256ZE-7TN100C?: Fully utilizing all 256 macrocells maximizes current functionality but reduces headroom for field upgrades or debugging. Designers often reserve 10–15% of macrocells for unused states, alternate protocols, or diagnostic features, which simplifies reconfiguration and reduces risk of timing degradation due to increased routing congestion. Given the device’s small size and low power, over-provisioning slightly is common in safety-critical designs where predictability outweighs minimal resource savings.

Can the LC4256ZE-7TN100C drive multiple loads simultaneously without degrading signal integrity?: While the LC4256ZE-7TN100C provides 64 I/O pins capable of driving standard CMOS levels, driving multiple loads—especially long traces or capacitive loads—requires attention to output slew rate and fanout. Exceeding recommended load thresholds can increase propagation delay beyond 7.5 ns and introduce ringing. For multi-drop configurations, external buffers or level translators may be necessary to maintain signal integrity and meet timing margins, particularly in backplane or modular systems.

How does the base product number LC4256 relate to the specific variant LC4256ZE-7TN100C, and what changes would justify selecting a different variant?: The LC4256 is the core architecture supporting multiple variants differentiated by speed grade, packaging, and temperature range. The “Z” denotes the ispMACH® 4000ZE family, while “7” indicates a high-performance speed grade matching the 7.5 ns delay. Choosing a different variant (e.g., -12 or -15) would extend propagation delay to support less stringent timing requirements, reducing cost but increasing power and footprint if repackaged. Selection depends on system clock frequency, ambient conditions, and form factor constraints.

In what scenarios would the LC4256ZE-7TN100C outperform discrete logic alternatives in embedded system design?: The LC4256ZE-7TN100C excels over discrete logic when implementing complex state machines, wide-bit arithmetic, or parallel protocol conversion where integration density and reliability matter. Compared to cascaded 74-series chips, it reduces board real estate, improves signal integrity through shorter interconnects, and eliminates skew accumulation. Its in-system programmability also enables rapid prototyping and field updates—advantages absent in hardwired discrete implementations, making it preferable in medical devices, automotive subsystems, or industrial automation requiring certified, updatable logic layers.

How does the supply voltage range of 1.7V to 1.9V influence interface compatibility with modern mixed-voltage systems?: Operating strictly at 1.8V (±0.1V) limits direct connectivity to 3.3V or 5V domains without level shifting. The LC4256ZE-7TN100C includes Schmitt-trigger inputs, which tolerate higher voltages but do not provide regulated output swing above 1.9V. Therefore, bidirectional translation circuits are essential when interfacing with legacy MCUs or sensors operating at higher voltages, adding component count but preserving signal integrity across voltage boundaries in mixed-signal designs.

What role does the 16 logic element/block structure play in the architecture of the LC4256ZE-7TN100C?: The ispMACH® 4000ZE architecture organizes logic into 16 macrocell blocks, each containing configurable flip-flops, AND arrays, and OR matrices. This modular structure enables efficient packing of combinatorial logic near sequential elements, reducing routing overhead and improving timing predictability. With 256 total macrocells distributed across these blocks, designers benefit from localized routing resources, minimizing global interconnect delays—a key factor in achieving consistent 7.5 ns performance despite moderate complexity tasks.

Are there any known limitations in using the LC4256ZE-7TN100C for cryptographic or security-sensitive applications?: The LC4256ZE-7TN100C lacks hardware security primitives such as tamper detection, secure boot, or cryptographic accelerators found in modern FPGAs. While it can implement basic obfuscation or access control logic, it is not suitable for protecting keys or executing authenticated algorithms against physical probing. For security functions requiring resistance to side-channel attacks or non-invasive fault injection, dedicated secure MCUs or ASICs remain preferable, relegating the CPLD to non-security-critical glue roles.

How does the RoHS3 compliance status of the LC4256ZE-7TN100C affect supply chain planning for global OEMs?: RoHS3 compliance ensures the LC4256ZE-7TN100C meets updated EU directives restricting hazardous substances, including stricter limits on DEHP and DIBP. This simplifies export documentation for products destined to European markets and reduces regulatory risk during product certification. However, manufacturers must still verify full material declarations (IMDS/ECAD) as RoHS3 introduces additional reporting requirements beyond basic lead-free status, influencing procurement workflows and audit preparation.

What considerations apply when replacing the LC4256ZE-7TN100C with another CPLD in an existing design?: Substituting the LC4256ZE-7TN100C requires matching or exceeding key parameters: propagation delay ≤7.5 ns, same or compatible package (TQFP), and sufficient macrocells/I/O. Voltage compatibility (1.7–1.9V) must also align to avoid redesigning regulator circuitry. Additionally, toolchain migration may be needed if vendor-specific synthesis tools differ, and timing simulations should validate worst-case paths under new part characteristics to ensure no regression in system performance.

Parts with Similar Specifications

The three parts on the right have similar specifications to Lattice Semiconductor Corporation LC4256ZE-7TN100C

Product Attribute
Part Number	LC4256ZE-7TN100I	LC4256ZE-5TN100C	LC4256ZE-7TN144C	LC4256ZC-75TN176C
Manufacturer	Lattice Semiconductor Corporation	Lattice Semiconductor Corporation	Lattice Semiconductor Corporation	Lattice Semiconductor Corporation
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Voltage Supply - Internal	-	-	-	-
Programmable Type	-	-	-	-
Series	-	-	-	-
Number of Macrocells	-	-	-	-
Number of Logic Elements/Blocks	-	-	-	-
Delay Time tpd(1) Max	-	-	-	-
Number of I/O	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Base Product Number	-	DAC34H84	MAX500	ADS62P42

LC4256ZE-7TN100C Datasheet PDF

Download LC4256ZE-7TN100C pdf datasheets and Lattice Semiconductor Corporation documentation for LC4256ZE-7TN100C - Lattice Semiconductor Corporation.

Datasheets: Cylindrical Battery Holders.pdf
Getting Started Guide: Product Selector Guide.pdf
Manuals: 2.73KHz.pdf

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
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