Overview: High-Performance 4Mb Configuration Memory Solution
The XC18V04VQ44I is a professional-grade in-system programmable configuration PROM designed specifically for Xilinx FPGA applications. This industrial-temperature 3.3V serial configuration memory delivers reliable, cost-effective bitstream storage with a 4-megabit (512KB) capacity in a compact 44-pin VQFP package.
Manufactured by AMD (formerly Xilinx), this configuration memory IC provides engineers and system designers with a robust solution for storing and loading FPGA configuration data in demanding industrial environments.
Technical Specifications
Core Features and Parameters
| Specification |
Details |
| Part Number |
XC18V04VQ44I |
| Manufacturer |
AMD (Xilinx) |
| Memory Type |
Configuration PROM (Programmable Read-Only Memory) |
| Memory Density |
4 Megabits (4Mb) |
| Memory Organization |
512K x 8 bits |
| Package Type |
44-Pin VQFP (Very Thin Quad Flat Pack) |
| Operating Voltage |
3.3V ±10% |
| Temperature Range |
Industrial: -40°C to +85°C |
| Programming Method |
In-System Programmable (ISP) |
| Interface Type |
Serial Configuration |
Electrical and Environmental Ratings
| Parameter |
Value |
| Supply Voltage (VCC) |
3.0V to 3.6V |
| Operating Temperature |
-40°C to +85°C (Industrial Grade) |
| Storage Temperature |
-65°C to +150°C |
| Lead-Free Status |
RoHS Compliant |
| MSL Rating |
Moisture Sensitivity Level 3 |
| Package Dimensions |
10mm x 10mm (typical VQFP-44) |
Key Features and Benefits
In-System Programmability
The XC18V04VQ44I supports in-system programming capabilities, allowing field updates and configuration changes without removing the device from the circuit board. This feature significantly reduces maintenance costs and enables remote firmware updates in deployed systems.
Industrial Temperature Range
With an operating temperature range from -40°C to +85°C, this PROM is engineered for harsh industrial environments including automotive, aerospace, telecommunications, and industrial control applications.
High-Density Storage
The 4-megabit memory capacity provides ample space for storing complex FPGA configuration bitstreams, supporting advanced designs with substantial logic resources and embedded features.
Serial Configuration Interface
The serial configuration interface minimizes pin count requirements and simplifies PCB routing compared to parallel configuration methods, making it ideal for space-constrained applications.
3.3V Operation
Low-voltage 3.3V operation reduces power consumption and enables compatibility with modern low-power FPGA families, contributing to overall system energy efficiency.
Applications and Use Cases
Primary Applications
| Application Domain |
Typical Uses |
| Industrial Automation |
PLC systems, motion controllers, process control |
| Telecommunications |
Base stations, routers, switching equipment |
| Automotive Electronics |
Advanced driver assistance systems (ADAS), infotainment |
| Medical Equipment |
Diagnostic imaging, patient monitoring systems |
| Aerospace & Defense |
Avionics, radar systems, secure communications |
| Test & Measurement |
Oscilloscopes, spectrum analyzers, data acquisition |
Configuration Architecture
When the FPGA operates in Master Serial mode, it generates a configuration clock that controls the PROM, enabling seamless automatic configuration on power-up or reset.
Package Information
44-Pin VQFP Package Details
| Package Attribute |
Specification |
| Package Type |
VQFP (Very Thin Quad Flat Pack) |
| Pin Count |
44 pins |
| Pitch |
0.8mm (typical) |
| Body Size |
10mm x 10mm x 1.4mm |
| Mounting Type |
Surface Mount Technology (SMT) |
| Package Code |
VQ44 |
The compact VQFP package offers excellent thermal performance and space efficiency, making it suitable for high-density PCB designs.
Compatibility and Integration
Compatible FPGA Families
This configuration PROM is specifically designed to work with various Xilinx FPGA families, including:
- Spartan series FPGAs
- Virtex series FPGAs
- XC4000 series devices
- Other Xilinx FPGAs supporting serial configuration mode
Pin Configuration Highlights
- Serial Data Output (D0): Connects directly to FPGA DIN pin
- Clock Input (CLK): Driven by FPGA configuration clock
- Chip Enable (CE): Active-low chip select
- Output Enable (OE): Controls data output
- Reset (RESET): Initializes internal state machine
Design Considerations
PCB Layout Guidelines
- Power Supply Decoupling: Place 0.1µF ceramic capacitors close to VCC pins
- Signal Integrity: Keep configuration signal traces short and direct
- Ground Plane: Use solid ground plane for noise immunity
- Thermal Management: Ensure adequate airflow for industrial temperature operation
Programming Requirements
- Programming Voltage: Standard 3.3V supply
- Programming Time: Typically <1 minute for full device
- Programming Cycles: Minimum 10,000 program/erase cycles
- Data Retention: 20 years minimum at 55°C
Quality and Compliance
Certifications and Standards
| Standard |
Status |
| RoHS Compliance |
Yes – Lead-Free |
| REACH Compliance |
Compliant |
| Conflict Minerals |
Conflict-Free |
| Quality System |
ISO 9001:2015 |
| Reliability Testing |
JEDEC Standards |
Ordering Information
Part Number Breakdown
XC18V04VQ44I
- XC18V: Product family (Configuration PROM)
- 04: Memory density (4 Megabit)
- VQ: Package type (VQFP)
- 44: Pin count (44 pins)
- I: Temperature grade (Industrial: -40°C to +85°C)
Package Quantities
| Package Type |
Quantity |
| Tube |
50 units |
| Tray |
250 units |
| Tape & Reel |
2,000 units |
Technical Resources
Documentation Available
- Product Datasheet (PDF)
- Application Notes
- Programming Specifications
- Package Mechanical Drawings
- IBIS Models
- 3D STEP Models
Development Tools
- iMPACT Programming Software
- ChipScope Pro Analyzer
- Vivado Design Suite (for newer FPGA projects)
- ISE Design Suite (legacy support)
Advantages Over Alternative Solutions
Why Choose XC18V04VQ44I?
Compared to External Flash Memory:
- Purpose-built for FPGA configuration with optimized interface
- Guaranteed compatibility with Xilinx FPGAs
- Simplified design with fewer external components required
- Proven reliability in FPGA applications
Compared to Parallel PROMs:
- Reduced pin count and PCB space requirements
- Lower power consumption during configuration
- Simplified routing and layout
- Cost-effective for medium to high-density designs
Industrial Temperature Grade Benefits:
- Extended operating range for harsh environments
- Higher reliability margins in automotive applications
- Suitable for outdoor and industrial installations
- Reduced system failures in temperature extremes
Frequently Asked Questions
Q: Can the XC18V04VQ44I be reprogrammed in the field?
Yes, this device supports in-system programming through JTAG interface, allowing field updates without board removal.
Q: What FPGAs are compatible with this configuration PROM?
The XC18V04VQ44I is compatible with Xilinx FPGAs that support serial Master mode configuration, including Spartan and Virtex families.
Q: What is the difference between ‘I’ and ‘C’ temperature grades?
The ‘I’ suffix indicates Industrial temperature range (-40°C to +85°C), while ‘C’ denotes Commercial range (0°C to +70°C).
Q: How long does FPGA configuration take?
Configuration time depends on bitstream size and clock frequency, typically ranging from milliseconds to seconds.
Q: Is this part still in production?
Check with authorized distributors for current production status, as AMD periodically updates product lines.
Related Products and Alternatives
Product Family Members
| Part Number |
Density |
Package |
| XC18V01VQ44I |
1 Megabit |
44-VQFP |
| XC18V02VQ44I |
2 Megabit |
44-VQFP |
| XC18V04VQ44I |
4 Megabit |
44-VQFP |
| XC18V04PC44I |
4 Megabit |
44-PLCC |
Procurement and Availability
Authorized Distributors
The XC18V04VQ44I is available through major electronic component distributors including:
- Digi-Key Electronics
- Mouser Electronics
- Arrow Electronics
- Avnet
- Future Electronics
Lead Time Considerations
Standard lead times vary based on distributor stock levels. For volume requirements or custom packaging, contact AMD directly or authorized distribution partners.
Conclusion: Reliable Configuration Solution for Professional FPGA Designs
The XC18V04VQ44I configuration PROM represents a proven, reliable solution for storing FPGA bitstreams in professional electronics applications. Its industrial temperature rating, in-system programmability, and robust 3.3V design make it an excellent choice for engineers developing telecommunications equipment, industrial controls, medical devices, and automotive systems.
With 4 megabits of configuration memory in a compact 44-pin VQFP package, this device offers the optimal balance of capacity, reliability, and cost-effectiveness for modern Xilinx FPGA designs operating in challenging environmental conditions.
For detailed technical specifications, programming guidelines, and design support, consult the official AMD/Xilinx documentation or contact your regional field application engineer.
