Overview of XC18V04VQ44-C PROM Configuration Memory
The XC18V04VQ44-C is a cutting-edge 4-megabit in-system programmable configuration PROM designed by AMD (formerly Xilinx) specifically for FPGA configuration storage and management. This industrial-grade memory IC delivers exceptional performance in demanding applications across telecommunications, automotive systems, industrial control, and consumer electronics sectors.
As a critical component in Xilinx FPGA systems, the XC18V04VQ44-C provides reliable non-volatile memory storage with advanced in-system programming capabilities, making it an essential solution for engineers and designers working with field-programmable gate arrays.
Key Technical Specifications
| Parameter |
Specification |
| Memory Capacity |
4 Megabits (512K x 8-bit) |
| Operating Voltage |
3.0V to 3.6V (3.3V nominal) |
| Access Time |
20ns |
| Clock Frequency |
Up to 33 MHz (Serial Mode) |
| Data Transfer Rate |
Up to 264 Mb/s (Parallel Mode at 33 MHz) |
| Package Type |
44-Pin VQFP (Very Thin Quad Flat Pack) |
| Package Dimensions |
10mm x 10mm |
| Temperature Range |
0°C to +70°C (Commercial Grade) |
| Program/Erase Cycles |
20,000 cycles minimum |
| Technology |
Advanced CMOS Flash Memory |
Advanced Features and Benefits
In-System Programmability
The XC18V04VQ44-C supports comprehensive in-system programming (ISP) capabilities, allowing field updates without removing the component from the PCB. This feature significantly reduces maintenance costs and enables rapid deployment of firmware updates.
Multi-Mode Configuration Support
This versatile PROM supports multiple FPGA configuration modes:
- Master Serial Mode – FPGA generates configuration clock
- Slave Serial Mode – External clock drives both PROM and FPGA
- Master SelectMAP Mode – High-speed parallel configuration
- Slave Parallel Mode – Enhanced data throughput
- Slave SelectMAP Mode – Advanced parallel interface
IEEE 1149.1 JTAG Boundary-Scan Compliance
Full support for JTAG testing and programming streamlines development, testing, and production processes. The 4-pin JTAG interface (TCK, TMS, TDI, TDO) enables efficient debugging and configuration management.
Cascading Capability
Multiple XC18V04VQ44-C devices can be cascaded by connecting the CEO (Chip Enable Output) to the CE (Chip Enable) input of subsequent devices, providing expanded memory capacity for large configuration bitstreams.
Performance Comparison Table
| Feature |
XC18V04VQ44-C |
Standard EEPROM |
Advantage |
| Configuration Speed |
Up to 264 Mb/s |
10-50 Mb/s |
5x Faster |
| Program/Erase Cycles |
20,000 cycles |
10,000 cycles |
2x Longer Life |
| Operating Voltage |
3.3V |
5V typical |
Lower Power |
| JTAG Support |
Full IEEE 1149.1 |
Limited/None |
Enhanced Testing |
| Temperature Range |
0°C to +70°C |
0°C to +70°C |
Equal Performance |
Pin Configuration and Interface
| Pin Group |
Function |
Description |
| Power Pins |
VCC, GND |
3.3V supply and ground connections |
| Data Pins |
D0-D7 |
8-bit parallel data bus for configuration |
| Control Signals |
CE#, OE#, WE# |
Chip enable, output enable, write enable |
| JTAG Interface |
TCK, TMS, TDI, TDO |
Standard JTAG programming and test interface |
| Clock |
CLK |
Configuration clock input |
| Cascade |
CEO |
Chip enable output for multi-device systems |
Target Applications and Use Cases
Telecommunications and Networking Equipment
The XC18V04VQ44-C excels in network infrastructure applications, managing configuration data for FPGAs handling data processing, signal transmission, and protocol management. Its fast reprogramming capability enables quick adaptation to evolving communication standards.
Automotive Electronics and ADAS Systems
Modern vehicles rely on this PROM for advanced driver assistance systems, infotainment platforms, and in-vehicle networking. The device ensures reliable FPGA configuration for processing sensor data, managing digital displays, and optimizing vehicle communication networks.
Industrial Control and Automation
Manufacturing and process control systems benefit from the robust configuration memory, providing consistent FPGA initialization in harsh industrial environments with extended temperature ranges available in industrial-grade variants.
Consumer Electronics
Home automation devices, smart appliances, multimedia systems, set-top boxes, digital displays, and gaming consoles utilize the XC18V04VQ44-C for flexible FPGA configuration management.
Package Information and Thermal Characteristics
| Package Characteristic |
Value |
| Package Type |
44-Pin VQFP (Very Thin Quad Flat Pack) |
| Body Size |
10mm x 10mm |
| Height |
1.4mm maximum |
| Lead Pitch |
0.8mm |
| Thermal Resistance (θJA) |
~50°C/W (typical) |
| Moisture Sensitivity Level |
MSL 3 (per JEDEC standard) |
| RoHS Compliance |
Lead-free, RoHS compliant |
Design Considerations and Best Practices
Power Supply Requirements
Maintain stable 3.3V supply voltage within the 3.0V to 3.6V operating range. Implement proper decoupling capacitors (0.1µF and 10µF) close to VCC pins to minimize supply noise and ensure reliable operation.
PCB Layout Guidelines
- Keep JTAG traces short and impedance-controlled
- Implement proper ground planes for noise immunity
- Route clock signals with care to minimize skew
- Provide adequate thermal relief for the VQFP package
- Follow standard SMT assembly practices for 0.8mm pitch devices
Programming and Configuration
Use compatible Xilinx programming tools such as Platform Cable USB, Parallel Cable IV, or third-party JTAG programmers. The device can be programmed using ISE Design Suite or Vivado Design Suite software.
Environmental and Reliability Specifications
| Parameter |
Specification |
| Storage Temperature |
-65°C to +150°C |
| Operating Temperature Range |
0°C to +70°C (Commercial) |
| ESD Protection |
HBM Class 2 (2kV minimum) |
| Latch-up Immunity |
±100mA per JEDEC standard |
| Data Retention |
20 years minimum at 85°C |
| Endurance |
20,000 program/erase cycles |
Ordering Information and Part Number Breakdown
Part Number: XC18V04VQ44-C
- XC18V = Xilinx Configuration PROM family
- 04 = 4 Megabit memory capacity
- VQ = VQFP package type
- 44 = 44-pin count
- C = Commercial temperature grade (0°C to +70°C)
Related Products and Alternatives
Family Variants
- XC18V02VQ44C – 2 Megabit capacity, same package
- XC18V01VQ44C – 1 Megabit capacity, same package
- XC18V04PC44C – 4 Megabit, PLCC44 package
- XC18V04VQ44I – 4 Megabit, Industrial temperature range (-40°C to +85°C)
Frequently Asked Questions
Q: What is the difference between XC18V04VQ44C and XC18V04VQ44-C?
The hyphen in XC18V04VQ44-C is simply a formatting variation. Both designations refer to the same component with identical specifications and functionality.
Q: Can this PROM be used with non-Xilinx FPGAs?
While designed specifically for Xilinx/AMD FPGAs, the XC18V04VQ44-C can potentially work with other FPGAs supporting compatible configuration protocols. However, optimal performance is achieved with Xilinx FPGA families.
Q: How many times can I reprogram this device?
The XC18V04VQ44-C supports a minimum of 20,000 program/erase cycles, making it suitable for frequent updates during development and field maintenance.
Q: What programming hardware do I need?
You can use Xilinx Platform Cable USB, Parallel Cable IV, or compatible third-party JTAG programmers. The device programs via standard JTAG interface using ISE or Vivado software.
Q: Is this component RoHS compliant?
Yes, the XC18V04VQ44-C features lead-free packaging and complies with RoHS environmental standards.
Why Choose XC18V04VQ44-C for Your FPGA Projects?
The XC18V04VQ44-C stands out as a premium configuration memory solution offering:
- Proven Reliability – Backed by AMD/Xilinx quality and extensive field deployment
- High Performance – Fast configuration times reduce system boot delays
- Design Flexibility – Multiple configuration modes support diverse system architectures
- Cost-Effective – Balance of features and price for mid-range applications
- Industry Support – Extensive documentation and community resources available
Conclusion
The XC18V04VQ44-C configuration PROM represents an optimal choice for engineers implementing FPGA-based designs requiring reliable, non-volatile configuration storage. Its combination of 4-megabit capacity, high-speed operation, in-system programmability, and robust construction makes it indispensable across telecommunications, automotive, industrial, and consumer electronics applications.
For seamless integration with Xilinx FPGA platforms, comprehensive JTAG support, and proven long-term reliability, the XC18V04VQ44-C delivers exceptional value for modern electronic designs. Whether you’re developing next-generation network equipment, automotive control systems, or consumer devices, this configuration memory provides the performance and flexibility your project demands.
