Overview of the XC3S400A-4FTG256I Field Programmable Gate Array
The XC3S400A-4FTG256I is a powerful Field-Programmable Gate Array (FPGA) from AMD’s (formerly Xilinx) renowned Spartan-3A family. This industrial-grade FPGA delivers exceptional performance with 400,000 system gates, making it an ideal choice for embedded systems, digital signal processing, and complex logic applications. Built on advanced 90nm technology, this programmable logic device offers engineers and designers the flexibility they need for modern electronic solutions.
Key Technical Specifications
Core FPGA Characteristics
| Specification |
Value |
| Family |
Spartan-3A |
| Logic Cells |
8,064 Cells |
| System Gates |
400,000 Gates |
| Logic Blocks |
896 CLBs |
| Maximum Frequency |
667 MHz |
| Technology Node |
90nm |
| Core Voltage |
1.2V (1.14V to 1.26V) |
| I/O Voltage |
3.3V |
Memory and Storage Features
| Memory Type |
Capacity |
| Total RAM Bits |
368,640 bits |
| Block RAM |
Distributed throughout fabric |
| User I/O Pins |
195 configurable I/Os |
Package Information
| Package Detail |
Specification |
| Package Type |
256-pin FTBGA (Fine-Pitch BGA) |
| Package Code |
FTG256 |
| Operating Temperature |
-40°C to +100°C (Industrial) |
| Moisture Sensitivity Level |
MSL 3 (168 hours) |
Why Choose the XC3S400A-4FTG256I FPGA?
Superior Performance for Industrial Applications
The XC3S400A-4FTG256I stands out in the competitive Xilinx FPGA market with its robust industrial temperature range and reliable performance. This makes it perfect for:
- Industrial automation and control systems
- Telecommunications equipment
- Medical devices and instrumentation
- Automotive electronics
- Consumer electronics
- Embedded computing applications
Advanced Clock Management
This Spartan-3A FPGA features integrated Digital Clock Manager (DCM) technology, providing:
- Precise frequency synthesis
- Phase shifting capabilities
- Clock distribution networks
- Jitter reduction for stable timing
Flexible I/O Architecture
With 195 user-configurable I/O pins, the XC3S400A-4FTG256I supports:
- Multiple I/O standards
- Single-ended and differential signaling
- LVDS, LVCMOS, and LVTTL interfaces
- Programmable drive strength
Application Areas and Use Cases
Digital Signal Processing (DSP)
The XC3S400A-4FTG256I excels in DSP applications thanks to its:
- High-speed data processing capabilities
- Efficient multiply-accumulate operations
- Parallel processing architecture
- Low-latency data paths
Communication Systems
Ideal for telecommunications and networking equipment:
- Protocol conversion and bridging
- Data packet processing
- Interface controllers
- Baseband processing
Embedded Control Systems
Perfect for complex control applications:
- Motor control algorithms
- Real-time data acquisition
- Sensor fusion and processing
- Custom peripheral interfaces
Design and Development Support
Compatible Development Tools
| Tool Category |
Software |
| Design Suite |
Xilinx ISE Design Suite |
| Synthesis |
XST (Xilinx Synthesis Technology) |
| Simulation |
ISim, ModelSim |
| Programming |
iMPACT, Platform Cable USB |
| Language Support |
VHDL, Verilog, Schematic Entry |
Development Resources
Engineers working with this FPGA have access to:
- Comprehensive datasheets and reference manuals
- Application notes and design guides
- IP cores and reference designs
- Active developer community support
- Evaluation boards and starter kits
Comparison with Alternative FPGAs
Spartan-3A Family Variants
| Part Number |
Logic Cells |
I/O Pins |
Package |
| XC3S400A-4FTG256I |
8,064 |
195 |
256-FTBGA |
| XC3S400A-4FG400C |
8,064 |
311 |
400-FBGA |
| XC3S400A-4PQ208C |
8,064 |
141 |
208-PQFP |
Power Consumption and Thermal Management
Power Specifications
| Power Parameter |
Typical Value |
| Core Voltage (VCCINT) |
1.2V nominal |
| I/O Voltage (VCCIO) |
3.3V (banks dependent) |
| Auxiliary Voltage (VCCAUX) |
2.5V |
| Standby Current |
Low power mode available |
Thermal Considerations
The industrial temperature range (-40°C to +100°C) ensures reliable operation in harsh environments. Proper thermal management includes:
- Heat sink compatibility with FTBGA package
- Adequate PCB thermal vias
- Airflow considerations for enclosed systems
Quality and Reliability
Manufacturing Standards
- RoHS compliant
- Lead-free package options available
- Industrial-grade quality assurance
- Extended temperature testing
Long-Term Availability
As part of AMD’s established Spartan-3A family, the XC3S400A-4FTG256I benefits from:
- Proven track record in production environments
- Extensive qualification testing
- Long product lifecycle support
- Broad distributor network
Programming and Configuration
Configuration Methods
| Configuration Mode |
Description |
| Master Serial |
SPI flash-based configuration |
| Slave Serial |
External processor control |
| JTAG |
Boundary scan and programming |
| Master Parallel |
Fast parallel configuration |
Configuration Memory
- Supports standard SPI flash devices
- In-system programmable (ISP)
- Bitstream encryption available
- Multi-boot configuration support
Purchase Considerations
Ordering Information
When ordering the XC3S400A-4FTG256I, verify:
- Speed grade: -4 (commercial industrial range)
- Package: FTG256 (256-pin Fine-pitch BGA)
- Temperature range: I (Industrial: -40°C to +100°C)
Availability and Distribution
This FPGA is available through:
- Authorized AMD/Xilinx distributors
- Major electronics component suppliers
- Global semiconductor distributors
- Direct from manufacturer channels
Technical Support and Resources
Documentation Available
- Product datasheet (DS529)
- Family overview documentation
- PCB design guidelines
- Thermal management guides
- Application notes
Community and Support
Access comprehensive support through:
- AMD/Xilinx technical forums
- FAE (Field Application Engineer) support
- Online design communities
- Training webinars and tutorials
Conclusion: The Ideal FPGA for Your Next Project
The XC3S400A-4FTG256I represents an excellent balance of performance, cost-effectiveness, and reliability. Whether you’re designing industrial control systems, telecommunications equipment, or embedded computing solutions, this Spartan-3A FPGA provides the resources and flexibility needed for successful implementation.
With 400K gates, 195 I/O pins, and industrial-grade temperature performance, the XC3S400A-4FTG256I delivers proven technology backed by AMD’s extensive FPGA expertise. Explore the possibilities of programmable logic with this versatile Xilinx FPGA solution and bring your innovative designs to life.
