Overview of XC3042-100PC84C Field Programmable Gate Array
The XC3042-100PC84C is a commercial-grade Field Programmable Gate Array (FPGA) from AMD Xilinx’s XC3000 Logic Cell Array family, designed to deliver reliable programmable logic solutions for diverse digital applications. This vintage yet dependable FPGA component offers 144 configurable logic blocks with 3000 usable gates, making it an excellent choice for legacy system maintenance, industrial control applications, and educational projects requiring proven technology.
Key Specifications and Technical Parameters
Core Architecture Features
| Specification |
Value |
| Product Family |
XC3000 Logic Cell Array |
| Total Logic Cells |
144 CLBs (Configurable Logic Blocks) |
| Usable Gates |
3000 gates |
| Maximum Frequency |
100 MHz |
| Supply Voltage |
5V Single Supply |
| Operating Temperature |
0°C to +70°C (Commercial Grade) |
| Package Type |
84-Pin PLCC (Plastic Leaded Chip Carrier) |
Detailed Component Parameters
| Feature |
Description |
| I/O Pins |
74 User I/O available |
| Technology |
CMOS Process |
| Configuration |
SRAM-based programmable |
| Logic Elements |
2000+ equivalent gates |
| Package Dimensions |
84-Lead J-Lead configuration |
| Mounting Type |
Surface Mount Technology |
| Manufacturer Part Number |
XC3042-100PC84C |
XC3042-100PC84C Architecture and Design Capabilities
Configurable Logic Blocks (CLBs)
The XC3042-100PC84C features 144 configurable logic blocks arranged in a flexible array architecture. Each CLB contains combinational logic functions, flip-flops, and routing resources that enable designers to implement complex digital circuits efficiently.
Input/Output Block Configuration
With 74 programmable I/O pins, this Xilinx FPGA provides ample connectivity for interfacing with external components, sensors, and communication protocols. The IOBs support various voltage standards and include programmable pull-up/pull-down resistors for signal integrity.
Interconnect Resources
The device incorporates a comprehensive interconnection network that links CLBs and IOBs, enabling flexible signal routing and optimal design implementation. This architecture supports both registered and combinational logic pathways.
Performance Characteristics and Speed Grades
Clock Performance
| Parameter |
Specification |
| Speed Grade |
-100 (100MHz maximum) |
| Flip-Flop Toggle Rate |
Up to 100 MHz |
| Global Clock Networks |
Multiple low-skew distribution |
| Setup Time |
Grade-dependent timing |
| Hold Time |
Optimized for reliability |
Power Consumption Profile
The XC3042-100PC84C operates on a standard 5V supply, typical of legacy FPGA designs. Power consumption scales with operating frequency and logic utilization, making it predictable for thermal management planning.
Applications and Use Cases
Industrial Automation Systems
This FPGA excels in industrial control applications, providing reliable programmable logic for:
- Motor control systems
- Process automation controllers
- Safety interlock circuits
- Sensor interface modules
- PLC replacement solutions
Legacy System Maintenance
The XC3042-100PC84C serves as a critical component for:
- Equipment retrofit projects
- Obsolete system replacement
- Long-term product support
- Military and aerospace applications
- Medical device maintenance
Educational and Prototyping
Design engineers and students benefit from:
- Digital logic learning platforms
- FPGA development training
- Algorithm implementation testing
- Hardware description language (HDL) projects
- Circuit design verification
Package Information and Physical Dimensions
84-Pin PLCC Package Details
| Dimension |
Measurement |
| Package Style |
J-Lead PLCC |
| Total Pins |
84 leads |
| Pin Pitch |
Standard PLCC spacing |
| Body Material |
High-temperature plastic |
| Thermal Rating |
Standard commercial grade |
| Moisture Sensitivity |
Level 3 per JEDEC |
Design Tools and Development Support
Software Compatibility
The XC3042-100PC84C requires specific development tools for programming and configuration:
- ISE Design Suite (legacy versions)
- XACT Development System (original toolchain)
- Schematic capture utilities
- VHDL/Verilog HDL compilers
- Place-and-route engines
Programming and Configuration
This SRAM-based FPGA supports multiple configuration modes including:
- Master serial mode
- Slave serial mode
- Peripheral mode
- Boundary scan (JTAG)
Comparison with Modern FPGA Solutions
| Feature |
XC3042-100PC84C |
Modern Alternatives |
| Logic Density |
3000 gates |
10K – 1M+ gates |
| Supply Voltage |
5V |
1.0V – 3.3V |
| Package |
PLCC-84 |
BGA, QFP variants |
| Speed |
100 MHz |
500 MHz – 1 GHz+ |
| Technology Node |
Older process |
7nm – 28nm |
Quality and Reliability Standards
The XC3042-100PC84C meets stringent quality requirements:
- Commercial temperature range certification
- RoHS compliance (version-dependent)
- Industry-standard testing procedures
- Established reliability track record
- Long-term availability commitment
Procurement and Supply Chain Information
Availability Status
Please Note: The XC3042-100PC84C is currently classified as an obsolete component by the manufacturer. However, authorized distributors may maintain limited inventory for legacy support purposes.
Ordering Information
When sourcing this component, verify:
- Speed grade suffix (-100)
- Temperature grade (C for commercial)
- Package type (PC84 for PLCC-84)
- Lead-free vs standard finish requirements
Technical Support Resources
Documentation Access
Engineers working with the XC3042-100PC84C should reference:
- XC3000 family datasheet
- Application notes for specific use cases
- Design constraint files
- Pin assignment documents
- Programming specifications
Community and Expert Support
Legacy FPGA support is available through:
- Technical forums specializing in vintage components
- Authorized distribution technical teams
- Professional engineering consultants
- Academic research communities
Environmental and Compliance Considerations
RoHS and Environmental Standards
Depending on the manufacturing date:
- Older versions may contain lead
- Later revisions offer RoHS-compliant options
- Proper disposal procedures required
- Electronic waste regulations apply
ESD Handling Precautions
As with all CMOS devices, the XC3042-100PC84C requires:
- Proper electrostatic discharge protection
- Grounded workstations during handling
- Anti-static packaging for storage
- Controlled humidity environments
Migration Path and Upgrade Options
Compatible Replacements
For new designs or upgrades, consider:
- XC3000A family (direct architectural successor)
- XC9500 CPLD series (simpler applications)
- Modern Spartan series (significant capability increase)
- Artix-7 family (current generation alternative)
Design Porting Considerations
When migrating from XC3042-100PC84C:
- HDL code may require minimal modification
- Pin assignments need complete remapping
- Timing constraints require re-analysis
- Power supply architecture changes necessary
Frequently Asked Questions
What is the main difference between speed grades?
The -100 designation indicates this device can operate at maximum frequencies up to 100 MHz, with corresponding timing parameters optimized for that performance level.
Can this FPGA be reprogrammed in-circuit?
Yes, the XC3042-100PC84C supports in-circuit programming through various configuration modes, allowing field updates and design iterations without removal.
What development tools are required?
Legacy Xilinx ISE software or the original XACT development system is needed. Modern Vivado software does not support this device family.
Is technical documentation still available?
Complete datasheets and application notes remain accessible through electronic component archives and specialized technical documentation repositories.
Conclusion: XC3042-100PC84C for Legacy and Specialized Applications
The XC3042-100PC84C represents proven FPGA technology ideal for maintaining legacy systems, supporting industrial equipment, and educational applications. While classified as obsolete for new designs, its reliable performance and well-documented characteristics make it valuable for specific use cases requiring long-term component compatibility.
For engineers maintaining existing systems incorporating this device, understanding its capabilities, limitations, and proper handling procedures ensures continued operational success. When planning new projects, evaluate whether modern FPGA alternatives better serve current requirements while keeping the XC3042-100PC84C as a reference for proven digital logic implementation.
