The XC2C256-FTG256CMS is a cutting-edge complex programmable logic device (CPLD) from Xilinx’s renowned CoolRunner-II family, designed to deliver exceptional performance in low-power applications. This advanced CPLD combines 256 macrocells with ultra-low power consumption, making it the ideal choice for battery-operated devices, portable electronics, and high-reliability communication systems.
Overview of XC2C256-FTG256CMS CPLD Technology
The XC2C256-FTG256CMS represents the pinnacle of Xilinx FPGA and CPLD technology, manufactured using advanced 0.18-micron CMOS process technology. This device features 256 macrocells organized into eight function blocks, interconnected through a sophisticated Advanced Interconnect Matrix (AIM) that ensures optimal signal routing and minimal power consumption.
Key Specifications Summary
| Specification |
Value |
| Part Number |
XC2C256-FTG256CMS |
| Manufacturer |
Xilinx Inc. |
| Product Family |
CoolRunner-II CPLD |
| Macrocells |
256 |
| Package Type |
256-Ball FTBGA (Fine-Pitch Ball Grid Array) |
| Ball Pitch |
1.0mm |
| User I/O Pins |
184 |
| Operating Voltage |
1.8V Core, 1.5V – 3.3V I/O |
| Speed Grade |
5.7ns pin-to-pin delay |
Technical Features and Capabilities
High-Performance Architecture
The XC2C256-FTG256CMS delivers industry-leading performance with pin-to-pin delays as fast as 5.7 nanoseconds, enabling operation at frequencies up to 256 MHz. This exceptional speed makes it suitable for demanding applications requiring rapid signal processing and real-time response.
Ultra-Low Power Consumption
Power efficiency is a hallmark of the CoolRunner-II architecture. The XC2C256-FTG256CMS achieves remarkably low quiescent current of just 13 microamperes, dramatically extending battery life in portable applications and reducing thermal management requirements in dense system designs.
Power Consumption Table
| Operating Mode |
Current Consumption |
| Quiescent (Standby) |
13 μA typical |
| Dynamic Operation |
Application dependent |
| I/O Banking |
Supports voltage translation |
Advanced Function Block Architecture
Each of the eight function blocks in the XC2C256-FTG256CMS contains:
- 40 × 56 Product Term PLA: Provides flexible logic implementation
- 16 Macrocells per Block: Configurable for combinational or registered operation
- 40 True and Complement Inputs: Fed from the Advanced Interconnect Matrix
- Flexible Register Configuration: D flip-flop, T flip-flop, or D latch modes
XC2C256-FTG256CMS Package and Pin Configuration
FTBGA Package Characteristics
The 256-ball Fine-Pitch Ball Grid Array package offers several advantages for modern PCB design:
| Package Feature |
Specification |
| Total Balls |
256 |
| Ball Pitch |
1.0mm |
| User I/O |
184 pins |
| Package Dimensions |
Compact footprint |
| Thermal Performance |
Enhanced heat dissipation |
| PCB Mounting |
Surface mount technology |
I/O Banking and Voltage Support
The XC2C256-FTG256CMS features two independent I/O banks, enabling seamless interfacing with mixed-voltage systems:
- 3.3V LVCMOS/LVTTL compatibility
- 2.5V LVCMOS support
- 1.8V LVCMOS operations
- 1.5V I/O with Schmitt-trigger inputs
Advanced Design Features
DualEDGE Clock Technology
The innovative DualEDGE flip-flop feature allows designers to capture data on both rising and falling clock edges, effectively doubling throughput while using lower-frequency clocks. This reduces overall power consumption while maintaining high-performance operation.
CoolCLOCK Architecture
The XC2C256-FTG256CMS implements CoolCLOCK technology, combining:
- Programmable Clock Divider: Eight different division ratios for GCK2
- DualEDGE Operation: Double data rate capability
- Power Optimization: Reduced frequency with maintained performance
DataGATE Power Management
DataGATE technology enables selective disabling of unused CPLD inputs, significantly reducing dynamic power consumption by minimizing unnecessary signal switching activity. This feature is particularly valuable in battery-powered applications.
Programming and Configuration Options
Flexible Register Configuration
| Register Type |
Configuration Options |
| Flip-Flop Types |
D-type, T-type |
| Latch Mode |
D-latch available |
| Power-Up State |
Configurable to 0 or 1 |
| Set/Reset |
Global and local options |
| Clock Enable |
Synchronous per macrocell |
Clock Distribution Network
The XC2C256-FTG256CMS provides comprehensive clocking options:
- Three Global Clocks: Available to all function blocks
- Product Term Clocks: Flexible local clock generation
- Clock Division: Programmable frequency division
- Individual Macrocell Control: Per-register clock selection
Applications and Use Cases
Industrial Control Systems
The XC2C256-FTG256CMS excels in industrial automation applications requiring:
- Real-time control logic
- Sensor interface management
- Motor control sequencing
- Protocol conversion
Consumer Electronics
Perfect for portable devices demanding low power:
- Battery-operated instruments
- Handheld gaming systems
- Smart home controllers
- Wearable technology
Communication Equipment
Ideal for networking and telecommunications:
- Protocol bridging
- Signal conditioning
- Interface standardization
- Glue logic implementation
Medical Devices
Suitable for medical electronics requiring reliability:
- Patient monitoring systems
- Diagnostic equipment
- Portable medical instruments
- Safety-critical control logic
Design Considerations and Best Practices
Thermal Management
| Parameter |
Specification |
| Junction Temperature |
Verify datasheet limits |
| Package Thermal Resistance |
FTBGA optimized |
| Cooling Requirements |
Minimal due to low power |
Power Supply Design
For optimal XC2C256-FTG256CMS performance:
- Core Supply (VCCINT): 1.8V ±5% tolerance
- I/O Supply (VCCIO): 1.5V to 3.3V per bank
- Decoupling: Multiple capacitors per power pin
- Power Sequencing: Follow manufacturer guidelines
Programming Tools and Development Support
Xilinx ISE Design Suite
The XC2C256-FTG256CMS is fully supported by Xilinx development tools:
- ISE WebPACK: Free development software
- Schematic Entry: Traditional design capture
- HDL Support: VHDL and Verilog synthesis
- Timing Analysis: Comprehensive verification tools
Development Resources
| Resource Type |
Availability |
| Datasheets |
Downloadable PDF |
| Reference Designs |
Application notes available |
| Evaluation Boards |
Third-party options |
| Technical Support |
Community and official channels |
Competitive Advantages
Why Choose XC2C256-FTG256CMS?
- Industry-Leading Power Efficiency: Lowest standby current in its class
- Proven Reliability: Mature CoolRunner-II technology
- Flexible I/O Options: Multi-voltage banking support
- Cost-Effective Solution: Optimal price-performance ratio
- Design Tool Maturity: Extensive software support
Comparison with Alternative Solutions
| Feature |
XC2C256-FTG256CMS |
Generic CPLD |
| Macrocells |
256 |
Varies |
| Quiescent Current |
13 μA |
Typically higher |
| I/O Pins |
184 |
Usually fewer |
| Voltage Flexibility |
1.5V – 3.3V |
Limited range |
| Speed Grade |
5.7ns |
Often slower |
Ordering Information and Availability
Part Number Breakdown
XC2C256-FTG256CMS nomenclature explained:
- XC2C: CoolRunner-II family designator
- 256: Number of macrocells
- F: Speed grade indicator
- TG256: Package type (256-ball FTBGA)
- C: Commercial temperature range
- M: Military-grade screening
- S: Special features/options
Stock and Procurement
The XC2C256-FTG256CMS is available through authorized distributors:
- Factory direct inventory
- Franchised distributor networks
- Excess stock channels
- Lead times vary by supplier
Quality and Compliance Standards
Environmental Compliance
| Standard |
Status |
| RoHS Compliance |
Lead-free available |
| REACH |
Compliant |
| Moisture Sensitivity |
Level specified in datasheet |
| ESD Protection |
Built-in safeguards |
Technical Support and Documentation
Available Resources
Engineers designing with the XC2C256-FTG256CMS can access:
- Complete Datasheets: Electrical and timing specifications
- Application Notes: Design guidelines and best practices
- PCB Layout Guidelines: Package-specific recommendations
- Errata Documents: Known issues and workarounds
- Community Forums: Peer support and discussion
Getting Started with XC2C256-FTG256CMS
- Download Development Tools: Install ISE WebPACK software
- Review Documentation: Study datasheet and user guides
- Design Entry: Create logic using HDL or schematic
- Synthesis and Implementation: Generate programming file
- Device Programming: Use compatible JTAG programmer
- System Integration: Test and validate in target application
Frequently Asked Questions
What makes the XC2C256-FTG256CMS suitable for low-power applications?
The device achieves exceptional power efficiency through several innovations: ultra-low quiescent current of 13 μA, DataGATE technology for selective input disabling, and optimized 0.18-micron CMOS process technology.
How many I/O pins does the FTBGA package provide?
The 256-ball FTBGA package (FTG256) offers 184 user I/O pins, providing extensive connectivity options for complex designs.
What development boards support the XC2C256-FTG256CMS?
While Xilinx doesn’t produce a dedicated board for this specific variant, the CoolRunner-II evaluation kits and third-party development platforms support the XC2C256 family with appropriate socket adapters.
Can this CPLD interface with both 3.3V and 1.8V logic?
Yes, the two independent I/O banks support mixed-voltage operation from 1.5V to 3.3V, enabling seamless interfacing with various logic families and system components.
Conclusion: XC2C256-FTG256CMS for Next-Generation Designs
The XC2C256-FTG256CMS represents an optimal balance of performance, power efficiency, and flexibility for modern embedded systems. With 256 macrocells, 184 I/O pins, and industry-leading low-power consumption, this CoolRunner-II CPLD delivers the capabilities designers need for demanding applications across industrial, consumer, medical, and communications markets.
Whether you’re developing battery-powered portable devices, implementing complex control logic, or bridging interfaces between different voltage domains, the XC2C256-FTG256CMS provides a proven, reliable solution backed by comprehensive development tools and extensive technical documentation.
For procurement inquiries, technical specifications, or design support, consult authorized Xilinx distributors and leverage the extensive online resources available through the Xilinx developer community and official documentation channels.
