The XC3S1500-4FGG456I is a high-performance, cost-optimized Field Programmable Gate Array (FPGA) from Xilinx (now AMD), part of the industry-proven Spartan-3 family. Featuring 1.5 million system gates, a 456-pin FBGA package, and industrial-grade temperature tolerance, this device is engineered for demanding embedded design, industrial automation, communications infrastructure, and consumer electronics applications. Whether you are prototyping a complex digital system or deploying a production-ready solution, the XC3S1500-4FGG456I delivers the performance, flexibility, and reliability that engineers demand.

For a full range of programmable logic devices, explore our collection of Xilinx FPGA products.

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XC3S1500-4FGG456I Key Specifications at a Glance

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What Is the XC3S1500-4FGG456I?

The XC3S1500-4FGG456I is a member of the Xilinx Spartan-3 FPGA family, a series spanning densities from 50,000 to 5,000,000 system gates. Built on a proven 90 nm process technology, this device brings significant advancements over earlier Spartan-IIE devices — including expanded logic resources, higher internal RAM capacity, more I/O pins, and improved clock management.

The Spartan-3 architecture draws heavily from Xilinx’s premium Virtex-II platform, delivering an impressive performance-per-dollar ratio that was unprecedented at launch and remains highly competitive today. This makes the XC3S1500-4FGG456I especially attractive for high-volume, cost-sensitive deployments.

How FPGAs Differ from ASICs

Unlike application-specific integrated circuits (ASICs), the XC3S1500-4FGG456I avoids the high non-recurring engineering (NRE) costs and long development cycles associated with custom silicon. It also supports in-field design updates without any hardware replacement — a critical advantage in iterative development environments and systems requiring post-deployment reconfiguration.

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XC3S1500-4FGG456I Architecture & Logic Resources

Configurable Logic Blocks (CLBs)

The XC3S1500-4FGG456I contains 3,328 CLBs, each composed of four slices. Each slice includes two 4-input look-up tables (LUTs), two flip-flops, and carry logic. This architecture supports a wide variety of functions, from simple combinational logic to complex registered pipelines.

Block RAM (BRAM)

The FPGA includes embedded Block RAM totaling 589,824 bits of on-chip memory. This allows designers to implement FIFOs, dual-port memories, lookup tables, and frame buffers without consuming CLB resources.

Dedicated Multipliers

The Spartan-3 family includes dedicated 18×18-bit multipliers optimized for DSP workloads such as filtering, signal processing, and arithmetic-intensive computations.

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XC3S1500-4FGG456I Pinout & Package Details

456-Pin FBGA Package

The XC3S1500-4FGG456I is housed in a 456-pin Fine-Pitch Ball Grid Array (FBGA) package, designed for high-density PCB integration. The compact footprint and fine-pitch ball arrangement make it ideal for space-constrained board designs.

I/O Capabilities

With 333 user I/O pins organized across multiple I/O banks, the XC3S1500-4FGG456I supports a wide range of interface standards, including LVTTL, LVCMOS, SSTL, HSTL, and differential signaling (LVDS, RSDS).

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Performance Characteristics

Speed Grade –4

The “–4” speed grade in the part number denotes the device’s performance tier. The XC3S1500-4FGG456I achieves:

• Maximum clock frequency: up to 630 MHz (internal)
• Pin-to-pin logic delays: as low as 4.4 ns
• Fast and deterministic timing suitable for real-time embedded control

Clock Management

The device features Digital Clock Managers (DCMs) that provide:

• Clock multiplication and division
• Phase shifting
• Deskewing
• Spread-spectrum clocking support

These capabilities ensure robust timing closure across complex multi-clock-domain designs.

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XC3S1500-4FGG456I Industrial Temperature Grade

The suffix “I” in XC3S1500-4FGG456I indicates the Industrial temperature grade, with a junction temperature range of –40°C to +100°C. This makes it suitable for deployment in harsh environments where commercial-grade (0°C to 85°C) devices would be insufficient.

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Applications of the XC3S1500-4FGG456I

Industrial Automation & Control

The wide operating temperature range and robust I/O structure make this FPGA ideal for motor drives, PLCs, robotics controllers, and factory automation systems requiring real-time processing with deterministic latency.

Embedded Communications & Networking

With 333 configurable I/O pins and fast serial capability, the XC3S1500-4FGG456I is well-suited for broadband access equipment, network switches, protocol bridges, and wireless basestation front-ends.

Consumer Electronics

Spartan-3 FPGAs were specifically architected for high-volume, cost-sensitive consumer applications, including digital TV, set-top boxes, home networking gateways, and portable consumer devices.

Automotive Systems

The industrial temperature rating qualifies the XC3S1500-4FGG456I for automotive control modules and sensor interface designs where reliability across temperature extremes is paramount.

Aerospace & Defense (COTS)

For commercial-off-the-shelf (COTS) defense applications requiring reconfigurable logic and extended temperature operation, this device fulfills the core requirements of many avionics and communications payloads.

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XC3S1500-4FGG456I vs Similar Spartan-3 Devices

The XC3S1500-4FGG456I occupies the sweet spot in the Spartan-3 lineup — delivering 1.5M gates in the mid-density 456-pin package with full industrial-grade tolerance.

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Design Tools & Programming

The XC3S1500-4FGG456I is fully supported by Xilinx’s ISE Design Suite, which provides:

• Schematic and HDL (VHDL/Verilog) entry
• Synthesis, implementation, and place-and-route
• Timing analysis and simulation
• Bitstream generation and JTAG programming

Configuration can be performed via:

• JTAG boundary scan (for in-circuit programming)
• Serial Flash (SPI) memory
• Parallel NOR Flash memory
• Platform Flash PROM (Xilinx XCF series)

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Power Supply Requirements

Proper decoupling capacitors placed close to each supply pin are essential for stable operation and EMI compliance.

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Ordering Information

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Frequently Asked Questions (FAQ)

What does the “4” speed grade mean in XC3S1500-4FGG456I?

The “–4” speed grade indicates a mid-range performance tier within the Spartan-3 family. Lower speed grade numbers (e.g., –5) indicate faster parts, while –4 balances performance and cost for the majority of applications.

What is the difference between XC3S1500-4FGG456I and XC3S1500-4FGG456C?

The only difference is the temperature grade: the “I” suffix indicates industrial operation (–40°C to +100°C), while the “C” suffix indicates commercial operation (0°C to 85°C).

Is the XC3S1500-4FGG456I still in production?

As part of AMD’s Xilinx Spartan-3 legacy portfolio, the XC3S1500-4FGG456I is widely available through authorized distributors for production continuity programs. Always verify current stock with your preferred distributor.

What software do I need to design with the XC3S1500-4FGG456I?

Xilinx ISE Design Suite (version 14.7 is the final release) fully supports the Spartan-3 family. ISE 14.7 is available as a free download from the AMD Xilinx website.

Can the XC3S1500-4FGG456I be used in safety-critical applications?

Yes, subject to appropriate qualification and design margins. The industrial temperature grade and robust architecture make it suitable for many safety-relevant embedded systems, though designers must follow applicable functional safety standards (e.g., IEC 61508, ISO 26262) for their application domain.

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Summary

The XC3S1500-4FGG456I is a proven, flexible, and cost-effective FPGA solution for engineers who need 1.5 million gates of reconfigurable logic in a 456-pin FBGA package with industrial temperature coverage. Its rich I/O count, embedded Block RAM, dedicated multipliers, and robust clock management capabilities make it one of the most versatile mid-density FPGAs in the Xilinx Spartan-3 lineup.

From industrial automation and embedded communications to consumer electronics and automotive control, the XC3S1500-4FGG456I continues to serve as a reliable foundation for complex programmable logic designs worldwide.