The XC3S50-5TQG144C is a high-performance, cost-efficient Field-Programmable Gate Array (FPGA) from Xilinx’s Spartan-3 family. Designed for high-volume, I/O-intensive applications, this device delivers 50,000 system gates in a compact 144-pin TQFP package. Whether you are developing embedded systems, consumer electronics, or industrial control applications, the XC3S50-5TQG144C offers a proven, flexible, and affordable programmable logic solution.

As part of the broader Xilinx FPGA product portfolio, the Spartan-3 series stands out for its mature 90nm process technology, low power consumption, and extensive I/O flexibility — making the XC3S50-5TQG144C an excellent choice for both new designs and legacy system support.

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What Is the XC3S50-5TQG144C?

The XC3S50-5TQG144C is a member of the Xilinx Spartan-3 FPGA family, a family that spans densities from 50K to 5 million system gates. The “XC3S50” designates the 50K-gate device in the family, “-5” indicates the high-performance speed grade, “TQG” refers to the Pb-free 144-pin Thin Quad Flat Pack (TQFP) package, and “C” indicates the commercial temperature range (0°C to +85°C).

This FPGA is manufactured on a 90nm CMOS process and operates at a core voltage of 1.2V, making it suitable for modern low-power digital designs.

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XC3S50-5TQG144C Key Specifications

The table below summarizes the primary technical specifications of the XC3S50-5TQG144C:

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XC3S50-5TQG144C Pin Configuration & Package Details

The TQG144 package is a 144-pin Thin Quad Flat Pack (TQFP) with lead-free (Pb-free) construction, denoted by the “G” in the package code. This package is widely used in space-constrained PCB designs where a fine-pitch SMD component is required.

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Spartan-3 Internal Architecture Overview

Understanding the internal architecture of the XC3S50-5TQG144C helps engineers make full use of its capabilities. The Spartan-3 architecture consists of five main programmable functional elements:

Configurable Logic Blocks (CLBs)

The XC3S50-5TQG144C contains 192 CLBs arranged in a 16×12 array. Each CLB contains four slices, and each slice contains two 4-input Look-Up Tables (LUTs), two storage elements (flip-flops or latches), and carry/control logic. CLBs are the primary resource for implementing custom combinational and sequential logic.

Block RAM

The device includes 72 Kbits of block RAM organized as a single column of 18-Kbit dual-port RAM blocks. Each RAM block supports independent read and write operations on two ports simultaneously, enabling efficient data buffering and FIFO implementations.

Dedicated Multipliers

Four 18×18-bit dedicated multipliers are embedded directly in the FPGA fabric. These hardware multipliers enable high-speed arithmetic operations for DSP-adjacent applications without consuming CLB resources.

Digital Clock Managers (DCMs)

Two Digital Clock Managers provide advanced clock control features including frequency synthesis, phase shifting, and clock deskewing. DCMs support a wide range of clocking topologies and are essential for timing closure in complex designs.

Input/Output Blocks (IOBs)

The 97 user-configurable IOBs support a wide variety of single-ended and differential I/O standards, enabling the XC3S50-5TQG144C to interface with a broad range of external devices and buses.

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Supported I/O Standards

The XC3S50-5TQG144C supports an extensive set of I/O standards, enabling seamless integration into mixed-voltage and high-speed system designs.

Note: DCI (Digitally Controlled Impedance) signal standards are not supported in Bank 5 of any Spartan-3 FPGA in the TQ144 package.

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XC3S50-5TQG144C Ordering Information Decoded

The part number encodes critical product information. Here is a breakdown:

For industrial temperature applications (-40°C to +100°C), the equivalent part number uses the suffix “I” instead of “C.”

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Applications & Use Cases

The XC3S50-5TQG144C is well-suited for a wide range of applications where a balance of cost, I/O flexibility, and programmable logic density is required:

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Design Tools & Development Support

Xilinx (now AMD) provides comprehensive tooling for designing with the XC3S50-5TQG144C:

• ISE Design Suite – The legacy Xilinx Integrated Synthesis Environment (ISE) provides full support for Spartan-3 design, including synthesis, implementation, simulation, and bitstream generation. ISE is the primary recommended tool for this device family.
• VHDL / Verilog / SystemVerilog – All standard HDL languages are supported for design entry.
• ModelSim / ISim – Functional and timing simulation can be performed to validate designs before programming.
• JTAG Configuration – The device is programmed via a standard JTAG interface (IEEE 1149.1), enabling in-circuit programming and debugging.

The newer Vivado Design Suite does not support Spartan-3 devices. Use ISE 14.7 for all XC3S50-based designs.

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Configuration Modes

The XC3S50-5TQG144C supports multiple configuration modes, providing flexibility for different system architectures:

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XC3S50-5TQG144C vs. Related Part Numbers

Engineers often compare this part against similar variants. The table below highlights key differences:

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Electrical Characteristics Summary

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Why Choose the XC3S50-5TQG144C?

The XC3S50-5TQG144C offers several compelling advantages for engineers and procurement teams:

Cost Efficiency – The Spartan-3 family was architected for high-volume, cost-sensitive markets. The 50K-gate density provides significant programmable logic capability at a competitive price point compared to ASICs or larger FPGA families.

Mature, Stable Platform – Based on proven 90nm technology with years of production history, this device offers supply chain stability and well-understood electrical behavior for long-lifecycle programs.

High-Performance Speed Grade – The -5 speed grade is the fastest offered in the Spartan-3 family, supporting system clock frequencies up to 725 MHz and minimizing timing closure challenges.

Pb-Free Compliance – The “G” in the package code confirms RoHS-compliant, lead-free construction, meeting global environmental regulations for electronics manufacturing.

Broad I/O Standard Support – With 97 user I/Os and support for both single-ended and differential standards across multiple voltage levels, the XC3S50-5TQG144C adapts to diverse system interface requirements.

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Frequently Asked Questions (FAQ)

Q: Is the XC3S50-5TQG144C still in production? A: Xilinx (AMD) has indicated Spartan-3 as recommended for new designs in some documentation; however, this is a mature product family. Always verify current production and last-time-buy status with your distributor before committing to large volume orders.

Q: What design tool should I use for the XC3S50-5TQG144C? A: Use Xilinx ISE Design Suite 14.7, the final version of ISE. Vivado does not support Spartan-3 devices.

Q: What is the difference between XC3S50-5TQG144C and XC3S50A-5TQG144C? A: The XC3S50A is from the enhanced Spartan-3A sub-family, which offers additional features such as dual VCCAUX supply support, configuration improvements, and slightly different cell counts (1,584 cells vs. 1,728). The core XC3S50 (non-A) and Spartan-3A are not pin-compatible, so they cannot be used as drop-in replacements.

Q: How is the XC3S50-5TQG144C configured? A: The device is configured via JTAG or from an external non-volatile memory source (SPI Flash, BPI Flash, or serial PROM) at power-up. Configuration is stored in SRAM-based configuration latches, so the bitstream must be reloaded at every power cycle unless an external configuration memory is used.

Q: What is the maximum I/O count for the TQ144 package? A: The TQ144 package supports up to 97 user I/O pins for the XC3S50 device density.

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Summary

The XC3S50-5TQG144C is a mature, reliable, and cost-effective FPGA from the Xilinx Spartan-3 family. With 50K system gates, 1,728 logic cells, 72 Kbits of block RAM, four 18×18 multipliers, and two DCMs — all in a compact 144-pin Pb-free TQFP package — it remains a strong solution for high-volume embedded and interface applications. Its -5 high-performance speed grade and broad I/O standard support make it equally suitable for performance-critical glue logic and I/O expansion roles.

For engineers seeking a proven programmable logic device with a well-established ecosystem of tools and documentation, the XC3S50-5TQG144C delivers reliable results.