The XC3042A-6PQ100C is a field programmable gate array manufactured by Xilinx (now part of AMD) that belongs to the proven XC3000 series family. This FPGA delivers reliable performance for embedded systems, digital signal processing, and custom logic implementations requiring flexible hardware solutions.

Product Overview: XC3042A-6PQ100C FPGA

The XC3042A-6PQ100C represents a mature and cost-effective solution for designers seeking programmable logic capabilities. As part of Xilinx’s legacy XC3000 architecture, this FPGA provides a balance of gate density, I/O flexibility, and operational speed suitable for various industrial and commercial applications.

Key Specifications at a Glance

Technical Features and Architecture

Programmable Logic Architecture

The XC3042A-6PQ100C utilizes Xilinx’s proven Logic Cell Array (LCA) architecture, which consists of three primary configurable elements:

Configuration Elements:

1. Input/Output Blocks (IOBs) – Perimeter-based programmable I/O interface
2. Configurable Logic Blocks (CLBs) – Core array of 144 programmable logic cells
3. Interconnect Resources – Flexible routing matrix for signal distribution

This architecture enables designers to implement custom digital logic functions, state machines, arithmetic operations, and interface protocols with high flexibility.

Performance Characteristics

Package Information

The 100-pin PQFP (Plastic Quad Flat Pack) package provides:

• Compact footprint for space-constrained PCB designs
• Standard pin pitch for reliable manufacturing
• Adequate thermal dissipation for commercial applications
• Compatible with standard SMT assembly processes

Applications and Use Cases

The XC3042A-6PQ100C FPGA is well-suited for:

• Embedded control systems requiring custom logic functions
• Digital signal processing applications with moderate complexity
• Interface bridging between different communication protocols
• Prototype development for ASIC validation
• Legacy system maintenance and replacement parts
• Educational projects and FPGA learning platforms
• Industrial automation controllers and state machines

Design Tools and Development Support

Software Compatibility

The XC3042A-6PQ100C is supported by Xilinx development tools:

• ISE Design Suite – Legacy design environment for XC3000 series
• Schematic capture for visual design entry
• VHDL/Verilog hardware description language support
• Place-and-route tools for automated implementation
• Timing analysis and simulation capabilities

For modern Xilinx FPGA development projects, designers may prefer newer device families with enhanced capabilities and Vivado Design Suite support, though the XC3000 series remains relevant for specific legacy applications.

Electrical Characteristics

Power Requirements

Operating Conditions

Configuration and Programming

The XC3042A-6PQ100C features SRAM-based configuration, requiring:

• External configuration memory (PROM, Flash, or microcontroller)
• Configuration upon each power-up cycle
• Support for multiple configuration modes:
  • Master Serial mode
  • Slave Serial mode
  • Parallel mode
  • Peripheral mode

Configuration Bitstream

The configuration bitstream defines all programmable elements including:

• Logic function implementation
• Interconnect routing
• I/O characteristics and direction
• Clock distribution networks

Comparison: XC3042A Series Variants

Ordering Information and Availability

When sourcing the XC3042A-6PQ100C, consider:

• Part number accuracy – Verify speed grade and package code
• Date code requirements – For consistency in production
• Quality certification – Ensure authorized distribution channels
• Lead time expectations – Legacy parts may have extended delivery
• Minimum order quantities – May vary by supplier

Design Considerations

Thermal Management

For reliable operation of the XC3042A-6PQ100C:

• Ensure adequate PCB copper for heat dissipation
• Consider ambient temperature in enclosure designs
• Monitor junction temperature under full load
• Follow derating guidelines for extended temperature applications

Signal Integrity

Best practices for XC3042A-6PQ100C implementation:

• Proper decoupling – Place 0.1µF ceramic capacitors near power pins
• Ground plane – Continuous ground reference reduces noise
• Controlled impedance – Match PCB trace impedances for high-speed signals
• Termination – Apply appropriate termination for transmission lines

Reliability and Quality

The XC3042A-6PQ100C offers:

• Proven technology with extensive field deployment history
• Industrial-grade reliability for commercial applications
• JEDEC-standard packaging for manufacturing compatibility
• Long-term availability through authorized distributors and surplus markets

Migration Path and Alternatives

For new designs, consider modern alternatives:

• Spartan-7 series – Cost-effective with enhanced performance
• Artix-7 series – Improved logic density and power efficiency
• Zynq SoC – Integrated processor for complex applications

However, the XC3042A-6PQ100C remains valuable for:

• Legacy system maintenance and repair
• Cost-sensitive applications with established designs
• Educational environments teaching FPGA fundamentals
• Prototyping simple digital logic circuits

Technical Support Resources

Access these resources for XC3042A-6PQ100C development:

• Datasheet documentation – Complete electrical and timing specifications
• Application notes – Design guidelines and reference implementations
• User guides – Architecture details and configuration procedures
• Development board schematics – Reference designs for evaluation
• Technical forums – Community support and troubleshooting assistance

Package Dimensions and PCB Footprint

The 100-pin PQFP package specifications:

Conclusion: XC3042A-6PQ100C Value Proposition

The XC3042A-6PQ100C FPGA delivers dependable programmable logic performance for applications requiring 3,000 gate equivalents and moderate operating frequencies. While newer FPGA families offer enhanced capabilities, this device maintains relevance for legacy support, educational purposes, and cost-optimized designs where its specifications meet system requirements.

Its 100-pin PQFP package, 5V operation, and 135 MHz performance make the XC3042A-6PQ100C suitable for embedded control, digital interface implementation, and prototype development where proven technology and straightforward design tools are priorities.

For engineers and procurement specialists seeking reliable FPGA solutions in the XC3000 family, the XC3042A-6PQ100C represents a well-established option backed by decades of successful implementations across diverse industrial and commercial applications.

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Frequently Asked Questions (FAQs)

Q: Is the XC3042A-6PQ100C still in production?
A: The XC3000 series is considered legacy, with availability primarily through authorized distributors and surplus/obsolete inventory channels rather than active production.

Q: What development tools support the XC3042A-6PQ100C?
A: The ISE Design Suite supports this device, though it has been superseded by Vivado for newer FPGA families. Legacy ISE versions remain available for XC3000 development.

Q: Can I replace XC3042A-6PQ100C with a modern FPGA?
A: Yes, but requires design migration due to different architectures, voltage levels (3.3V/1.8V vs 5V), and development tools. Pin compatibility is unlikely.

Q: What is the difference between speed grades -6 and -7?
A: The -6 speed grade offers faster maximum frequency (135 MHz) compared to -7 grade (113 MHz). Lower numbers indicate better performance in Xilinx naming conventions.

Q: Does the XC3042A-6PQ100C retain configuration after power loss?
A: No, SRAM-based FPGAs require reconfiguration on each power cycle. External non-volatile memory must store the configuration bitstream.