The XC3S5000-4FG900I is a high-performance Field-Programmable Gate Array (FPGA) from AMD Xilinx, belonging to the Spartan-3 family. Designed for cost-sensitive, high-volume applications, this device delivers 5 million system gates, 74,880 logic cells, and operates at up to 630 MHz — all within a compact 900-Pin Fine-Pitch Ball Grid Array (FBGA) package. Whether you’re building broadband access equipment, industrial automation systems, or digital television hardware, the XC3S5000-4FG900I offers an exceptional balance of density, performance, and value.

If you are looking for a reliable and versatile Xilinx FPGA, the XC3S5000-4FG900I is one of the most capable members in the Spartan-3 lineup.

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XC3S5000-4FG900I Key Specifications at a Glance

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What Is the XC3S5000-4FG900I?

The XC3S5000-4FG900I is the flagship member of Xilinx’s eight-device Spartan-3 family, covering densities from 50,000 to 5,000,000 system gates. It builds on the Spartan-IIE platform and incorporates key enhancements derived from Virtex-II technology — including expanded logic resources, deeper internal RAM, higher I/O counts, and improved clock management. These upgrades, combined with a mature 90nm process node, allow the XC3S5000-4FG900I to deliver significantly more functionality per dollar than earlier-generation programmable logic devices.

How the Part Number Breaks Down

Understanding the XC3S5000-4FG900I part number helps engineers quickly decode device attributes:

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XC3S5000-4FG900I Logic & Memory Resources

Configurable Logic Blocks (CLBs)

The XC3S5000-4FG900I features an array of Configurable Logic Blocks (CLBs), each containing multiple slices. Each slice includes look-up tables (LUTs), flip-flops, carry logic, and shift register support, enabling dense and efficient implementation of combinatorial and sequential logic.

Block RAM & Distributed RAM

The XC3S5000-4FG900I uses a hierarchical SelectRAM memory architecture, with four RAM columns embedded in the CLB array. Each 18-Kbit block RAM comes paired with a dedicated 18×18 multiplier, enabling highly efficient DSP and signal processing pipelines.

Digital Clock Management (DCM)

Clock management is handled by four dedicated Digital Clock Managers (DCMs), placed at the ends of the outer block RAM columns. These DCMs provide:

• Clock skew elimination for synchronous design
• Frequency synthesis for flexible clock generation
• High-resolution phase shifting for interface timing
• Eight global clock lines and abundant local routing

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XC3S5000-4FG900I I/O Capabilities

SelectIO Signaling Standards

With up to 633 I/O pins available in the FG900 package, the XC3S5000-4FG900I supports a wide range of single-ended and differential signaling standards, making it highly adaptable for interfacing with external memory, processors, and communication ICs.

Package Information: 900-Pin FBGA

The 900-pin Fine Ball Grid Array (FBGA) package provides a compact footprint suitable for dense PCB layouts. Pins are organized in a grid matrix, and designers must follow the XC3S5000-4FG900I pinout carefully as each pin serves a specific role — power, ground, or signal.

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XC3S5000-4FG900I Applications

The XC3S5000-4FG900I is suitable for a broad spectrum of applications, particularly where logic density, I/O flexibility, and cost-efficiency are critical factors.

Target Markets & Use Cases

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XC3S5000-4FG900I vs. Related Spartan-3 Devices

When selecting between Spartan-3 variants, the table below helps engineers understand how the XC3S5000-4FG900I compares to neighboring members in the family.

The XC3S5000-4FG900I sits at the top of the Spartan-3 lineup and is ideal when maximum logic density is required within a cost-optimized budget.

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Design Tools for XC3S5000-4FG900I

Xilinx ISE Design Suite

The XC3S5000-4FG900I is fully supported by the Xilinx ISE Design Suite, which provides:

• ISE Project Navigator for design entry and synthesis
• ModelSim / ISim for behavioral and timing simulation
• IMPACT programmer for JTAG and configuration file loading
• PlanAhead for floorplanning and placement constraints
• XPower for power estimation

Because the Spartan-3 family predates the Vivado era, ISE remains the primary supported toolchain for XC3S5000-4FG900I development. Engineers comfortable with ISE will find the workflow for XC3S5000-4FG900I development familiar and well-documented.

Configuration & Programming

The XC3S5000-4FG900I supports multiple configuration modes:

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Ordering & Industrial Temperature Rating

The “I” suffix in XC3S5000-4FG900I denotes the industrial temperature grade, specifying a junction temperature range of –40°C to +100°C. This makes the device well-suited for deployment in environments exposed to thermal stress, such as outdoor telecommunications equipment, industrial control panels, and automotive electronics.

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Frequently Asked Questions: XC3S5000-4FG900I

What is the maximum operating frequency of the XC3S5000-4FG900I?

The XC3S5000-4FG900I operates at a maximum frequency of 630 MHz, making it suitable for high-speed digital signal processing and data-intensive applications.

How many I/O pins does the XC3S5000-4FG900I have?

The device supports up to 633 user I/O pins in the 900-pin FBGA package, with support for 18 single-ended and 8 differential signaling standards.

Is the XC3S5000-4FG900I RoHS compliant?

No. The XC3S5000-4FG900I is not RoHS compliant. Engineers working on designs with environmental or export compliance requirements should verify this against their regulatory obligations.

What development software supports the XC3S5000-4FG900I?

The XC3S5000-4FG900I is supported by the Xilinx ISE Design Suite. Vivado does not support Spartan-3 devices; ISE is the appropriate toolchain for this family.

Can the XC3S5000-4FG900I be used in aerospace and defense applications?

Yes. The industrial temperature rating (–40°C to +100°C TJ) and high logic density make the XC3S5000-4FG900I a solid candidate for aerospace avionics, radar, and defense system designs.

What is the core voltage of the XC3S5000-4FG900I?

The XC3S5000-4FG900I operates at a 1.2V core voltage, enabling relatively low-power operation compared to older FPGA families.

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Summary

The XC3S5000-4FG900I is a mature, proven, and cost-effective FPGA that offers the highest gate count in the Spartan-3 family. With 5 million system gates, 633 I/O pins, 1,728 Kbits of block RAM, four DCMs, and support for DDR and differential I/O standards — all housed in a 900-pin FBGA package with industrial temperature coverage — this device remains a reliable choice for engineers across consumer electronics, telecommunications, industrial, and defense markets.

Its compatibility with the Xilinx ISE Design Suite and robust documentation ecosystem mean that teams can bring designs to production quickly and confidently. For any high-density programmable logic application where cost control is essential, the XC3S5000-4FG900I continues to deliver outstanding value.