The XC3S5000-5FG900I is a high-performance, industrial-grade Field-Programmable Gate Array from Xilinx’s Spartan-3 family, delivering 5 million system gates in a compact 900-pin Fine-Pitch Ball Grid Array (FBGA) package. Engineered for demanding embedded applications, this device combines exceptional logic density, abundant on-chip memory, and robust I/O flexibility — all in a cost-optimized silicon platform built on 90nm process technology.

Whether you are designing industrial control systems, telecommunications equipment, or high-throughput signal processing applications, the XC3S5000-5FG900I offers the programmable logic horsepower and reliability your design demands. As one of the most capable devices in the Xilinx FPGA Spartan-3 lineup, this part continues to be a trusted choice for engineers worldwide.

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What Is the XC3S5000-5FG900I?

The XC3S5000-5FG900I belongs to the Spartan-3 family, Xilinx’s cost-efficient, high-density FPGA series designed for high-volume, performance-sensitive applications. The part number breaks down as follows:

• XC3S5000 — Spartan-3 device with 5,000,000 system gates
• -5 — Speed grade 5 (fastest available in this family, rated at 725 MHz)
• FG900 — Fine-pitch BGA package with 900 pins
• I — Industrial temperature range (–40°C to +100°C)

This makes the XC3S5000-5FG900I the highest-speed, industrial-temperature variant of the XC3S5000 in the FG900 package — ideal for environments where reliability across a wide temperature range is non-negotiable.

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XC3S5000-5FG900I Key Specifications

General Overview

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Logic Resources

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Memory Resources

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Clock and Timing

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I/O Specifications

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Package Details

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XC3S5000-5FG900I Part Number Decoder

Understanding the Xilinx part numbering system helps you select the right variant for your design. The table below explains each field of the XC3S5000-5FG900I part number.

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Speed Grade Comparison: XC3S5000 FG900 Variants

The XC3S5000 is available in multiple speed grades within the FG900 package. Choosing the right speed grade depends on your design’s timing requirements and power budget.

The XC3S5000-5FG900I is the premier choice when both maximum speed and extended temperature operation are required simultaneously.

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Key Features of the XC3S5000-5FG900I

SelectIO™ Signaling Interface

The XC3S5000-5FG900I supports an extensive range of I/O standards through Xilinx’s SelectIO technology. With up to 633 user I/O pins, the device can interface with virtually any logic standard in modern embedded systems.

Supported single-ended standards include LVTTL, LVCMOS (1.2V through 3.3V), PCI, GTL, HSTL, and SSTL variants. Differential standards include LVDS, RSDS, LVPECL, HSTL, and SSTL, enabling high-speed serial data transmission with excellent noise immunity.

Double Data Rate (DDR) support allows interface with high-bandwidth memory and communication protocols without external bridging logic.

Configurable Logic Blocks (CLBs) with Shift Register Capability

Each CLB in the XC3S5000-5FG900I contains four slices, and each slice houses two 4-input Look-Up Tables (LUTs) and two flip-flops. The LUTs can be configured as combinational logic, 16-bit shift registers (SRL16), or distributed RAM — providing remarkable design flexibility without consuming dedicated memory resources.

Wide multiplexers (F5MUX, F6MUX, F7MUX, F8MUX) cascade logic functions efficiently, enabling fast carry chains and wide arithmetic operations critical in DSP and data-path intensive designs.

Block RAM: Dual-Port 18 Kbit Blocks

The device integrates 96 dual-port Block RAM modules, each 18 Kbits in size, totaling 1,728 Kbits of on-chip synchronous RAM. Each block RAM supports true dual-port operation — both ports can read and write independently and simultaneously. This eliminates external SRAM requirements for many embedded designs, reducing BOM cost and PCB complexity.

Block RAM widths are configurable from ×1 to ×36 bits, and each block RAM is tightly coupled with a dedicated 18×18-bit hardware multiplier, enabling efficient DSP kernel implementation.

Dedicated 18×18-Bit Multipliers

With 104 dedicated hardware multipliers, the XC3S5000-5FG900I delivers significant fixed-point arithmetic throughput without consuming CLB resources. These multipliers are ideal for FIR filter banks, FFT butterflies, matrix operations, and other signal processing kernels, operating synchronously alongside adjacent block RAM for pipelined datapath designs.

Digital Clock Manager (DCM)

Four Digital Clock Managers provide sophisticated on-chip clock management capabilities:

• Clock Skew Elimination — Zero-delay clock buffering compensates for distribution network delays, delivering clean, aligned clocks throughout the device.
• Frequency Synthesis — Generates derived clock frequencies using rational multiplication and division, eliminating many external PLL/clock generator ICs.
• Phase Shifting — High-resolution phase adjustment in fine increments enables precise timing margin control for source-synchronous interface designs.

Eight global clock networks distribute clocks with minimal skew across the full device, ensuring timing closure even at 725 MHz operation.

JTAG Configuration and Boundary Scan

The XC3S5000-5FG900I is fully compliant with IEEE 1149.1 (JTAG boundary scan) and IEEE 1532 (in-system configuration), enabling straightforward board-level testing and in-field reprogramming. Configuration can be performed in Master Serial, Slave Serial, Master SelectMAP, or Slave SelectMAP modes using standard Xilinx programming cables.

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Industrial Temperature Range: What It Means for Your Design

The “I” suffix in XC3S5000-5FG900I specifies an industrial operating temperature range of –40°C to +100°C (junction temperature). This is critical for applications deployed in environments where ambient temperatures fluctuate significantly or heat dissipation is constrained.

Where Industrial-Grade FPGAs Are Essential

Commercial-grade variants (suffix “C”) are rated only from 0°C to +85°C junction temperature. Using the industrial-grade XC3S5000-5FG900I eliminates risk in temperature-stressed deployments and typically results in better screening for reliability-sensitive applications.

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Typical Applications for the XC3S5000-5FG900I

The combination of 5 million gates, 633 I/Os, abundant block RAM, hardware multipliers, and industrial temperature qualification makes the XC3S5000-5FG900I a versatile platform for demanding embedded designs.

Signal Processing and DSP

The 104 dedicated multipliers paired with 1,728 Kbits of block RAM enable real-time FIR/IIR filtering, FFT computation, and modulation/demodulation kernels at throughput levels previously requiring dedicated DSP ASICs.

High-Speed Communication Interfaces

With support for LVDS, DDR, and a wide array of I/O standards across 633 pins, the XC3S5000-5FG900I can implement multi-channel UART, SPI, I²C, PCIe endpoint logic, Ethernet MAC, and custom high-speed serial protocols in fabric.

Embedded Processor Systems

Using Xilinx’s MicroBlaze soft processor core (available in ISE Design Suite), engineers can implement complete 32-bit RISC processor subsystems including instruction cache, data cache, peripheral bus, and custom accelerators — all within a single XC3S5000-5FG900I device.

Industrial Control and Motor Drive

The FPGA’s deterministic parallel execution model makes it ideal for real-time control loops, encoder interfaces, PWM generation, and safe-state machine implementation in industrial motor drives and motion controllers.

Video and Display Processing

High I/O count and fast internal clock speeds support line-rate video processing pipelines for display scaling, color space conversion, and multi-channel image acquisition systems.

Broadband Access and Networking

Xilinx designed the Spartan-3 family specifically for broadband access, home networking, and digital television equipment — the XC3S5000-5FG900I’s top speed grade maximizes headroom in these throughput-intensive designs.

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XC3S5000-5FG900I vs. Related Parts: Quick Comparison

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Design Tool Support

The XC3S5000-5FG900I is supported by Xilinx ISE Design Suite (the recommended toolchain for Spartan-3 devices). ISE provides a complete RTL-to-bitstream flow including:

• XST — Xilinx Synthesis Technology for Verilog and VHDL
• NGDBuild / MAP / PAR — Implementation tools for placement and routing
• iMPACT — JTAG-based device programming
• ChipScope Pro — Embedded logic analyzer for in-system debug
• PlanAhead — Floorplanning and physical design exploration

Note: Spartan-3 devices are not supported in Vivado Design Suite. ISE 14.7 is the final and recommended version for XC3S5000-5FG900I design.

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Ordering Information

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Frequently Asked Questions

Q: What is the difference between XC3S5000-5FG900I and XC3S5000-4FG900I? The only difference is the speed grade. The -5 variant operates at up to 725 MHz (internal frequency), while the -4 variant is rated at 630 MHz. Both share identical logic resources, memory, I/O count, package, and industrial temperature range. Choose the -5 grade when your timing analysis requires the additional timing margin.

Q: Is the XC3S5000-5FG900I still in production? The Spartan-3 family is a legacy product line. Availability depends on distributor inventory. It is recommended to verify stock with authorized distributors and consider long-term supply chain planning for new designs.

Q: What configuration memory is used with the XC3S5000-5FG900I? The XC3S5000-5FG900I is typically configured using Xilinx Platform Flash (XCF) devices or SPI/parallel NOR flash via the JTAG or dedicated configuration interface. The device is volatile and requires configuration at every power-up.

Q: Can I use the XC3S5000-5FG900I with Vivado? No. Spartan-3 devices are not supported by Vivado. You must use ISE Design Suite 14.7 for all design, simulation, and implementation tasks.

Q: What does the “I” at the end of the part number mean? The “I” designates the Industrial temperature grade, meaning the device is characterized and screened for operation from –40°C to +100°C junction temperature. The “C” suffix indicates Commercial grade (0°C to +85°C).

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Summary

The XC3S5000-5FG900I remains a powerful choice for engineers who need maximum logic density, fast operation at 725 MHz, and proven industrial-temperature reliability in the Spartan-3 architecture. Its combination of 5 million system gates, 74,880 logic cells, 1,728 Kbits of block RAM, 104 dedicated multipliers, and 633 user I/Os — packaged in the 900-pin FBGA with industrial temperature screening — makes it one of the most capable devices in its class for high-complexity, cost-sensitive embedded system designs.

For a broader view of the Spartan-3 family and other programmable logic solutions, explore the full range of Xilinx FPGA products.