Overview of XC18V04VQG44C Configuration Memory
The XC18V04VQG44C is a 4-megabit configuration PROM designed for FPGA systems, manufactured by AMD (formerly Xilinx). This highly reliable configuration memory device provides seamless FPGA configuration storage with reprogrammable capabilities, making it an essential component for advanced embedded systems and industrial applications.
The XC18V04VQG44C offers robust performance with its 44-pin VQFP package design, delivering exceptional flexibility through both parallel and serial configuration modes. Engineers and designers trust this component for mission-critical applications requiring reliable non-volatile memory storage.
Technical Specifications Table
| Specification |
Details |
| Manufacturer |
AMD (Xilinx Inc.) |
| Part Number |
XC18V04VQG44C |
| Memory Capacity |
4 Megabits (512K x 8) |
| Supply Voltage |
2.5V to 3.3V |
| Package Type |
44-Pin VQFP (Very Thin Quad Flat Package) |
| Operating Temperature |
-40°C to +85°C (Industrial Grade) |
| Storage Temperature |
-65°C to +150°C |
| Configuration Modes |
Master Serial, Slave Serial, Master SelectMAP, Slave Parallel |
| Access Time |
20ns typical |
| Maximum Clock Frequency |
33 MHz |
| Technology |
CMOS |
| Programming |
In-System Programmable (ISP) |
| Interface Support |
JTAG IEEE 1149.1 Boundary-Scan |
Key Features and Benefits
Advanced Configuration Capabilities
The device supports multiple FPGA configuration modes including Master Serial, Slave Serial, Master SelectMAP, Slave Parallel, and Slave SelectMAP, ensuring maximum compatibility with various FPGA architectures and system designs.
In-System Programmability
The XC18V04VQG44C features full in-system programming capability through JTAG interface, eliminating the need for device removal during firmware updates. This critical feature significantly reduces maintenance time and system downtime in production environments.
Reliable Non-Volatile Storage
Built with high-quality CMOS technology, this configuration PROM provides dependable data retention without requiring continuous power. The device guarantees data integrity across power cycles, making it ideal for applications requiring persistent configuration storage.
Compact Package Design
The 44-pin VQFP package measures 10x10mm, offering an excellent balance between pin count and board space efficiency. This compact footprint enables designers to optimize PCB layouts while maintaining full functionality.
Pin Configuration Overview
| Pin Category |
Function |
| VCC |
Power Supply Input (2.5V/3.3V) |
| GND |
Ground Reference |
| D0-D7 |
Bi-directional Data Bus |
| CE# |
Chip Enable (Active Low) |
| OE# |
Output Enable (Active Low) |
| WE# |
Write Enable (Active Low) |
| TCK |
Test Clock (JTAG) |
| TMS |
Test Mode Select (JTAG) |
| TDI |
Test Data Input (JTAG) |
| TDO |
Test Data Output (JTAG) |
| CLK |
Clock Input |
| RESET |
Reset Signal |
| CEO |
Chip Enable Output (Cascading) |
Applications and Use Cases
FPGA Configuration Management
The primary application for the XC18V04VQG44C involves storing configuration bitstreams for Xilinx FPGA devices. Upon power-up or reset, the PROM automatically loads the stored configuration into the target FPGA, ensuring consistent system initialization.
Industrial Control Systems
Industrial automation systems leverage this configuration memory for programmable logic controllers (PLCs), robotic systems, and process control equipment. The device’s industrial temperature range and reliability make it suitable for harsh environments.
Telecommunications Infrastructure
Network equipment manufacturers utilize the XC18V04VQG44C for routing systems, switching fabrics, and communication protocol processing. The device enables field-upgradeable firmware for telecommunications hardware.
Automotive Electronics
Advanced driver assistance systems (ADAS), infotainment platforms, and engine control units benefit from the XC18V04VQG44C’s reliable configuration storage and automotive-grade specifications.
Consumer Electronics
High-end consumer devices including digital cameras, gaming consoles, and smart home systems integrate this PROM for flexible hardware configuration and feature updates.
Medical Equipment
Medical device manufacturers rely on this configuration memory for diagnostic equipment, patient monitoring systems, and surgical instruments requiring FDA-compliant configuration management.
Performance Characteristics Table
| Parameter |
Minimum |
Typical |
Maximum |
Unit |
| Supply Voltage (VCC) |
2.3 |
3.3 |
3.6 |
V |
| Supply Current (Active) |
– |
30 |
50 |
mA |
| Supply Current (Standby) |
– |
100 |
200 |
μA |
| Access Time |
– |
20 |
30 |
ns |
| Clock Frequency |
– |
25 |
33 |
MHz |
| Input High Voltage |
2.0 |
– |
VCC+0.5 |
V |
| Input Low Voltage |
-0.5 |
– |
0.8 |
V |
| Output High Voltage |
2.4 |
– |
– |
V |
| Output Low Voltage |
– |
– |
0.4 |
V |
Design Considerations
Thermal Management
The VQFP-44 package exhibits thermal resistance of approximately 50°C/W, requiring adequate PCB design considerations for heat dissipation. Designers should incorporate thermal vias and sufficient copper planes to maintain junction temperature within specifications.
Power Supply Decoupling
Proper decoupling capacitors (0.1μF ceramic and 10μF tantalum) placed near the VCC pins ensure stable operation and reduce electromagnetic interference. Follow PCB layout best practices for high-speed digital circuits.
Signal Integrity
For designs operating at maximum clock frequencies, maintain controlled impedance traces and minimize signal path lengths. Use ground planes to reduce crosstalk and ensure clean signal transitions.
Programming Interface
The JTAG interface requires pull-up resistors on TMS and TDI pins for proper operation. Consult the manufacturer’s datasheet for recommended resistor values and connection guidelines.
Comparison with Similar Products
| Feature |
XC18V04VQG44C |
XC18V02 |
XC18V01 |
| Memory Size |
4 Mbit |
2 Mbit |
1 Mbit |
| Pin Count |
44 |
32 |
20 |
| Package Options |
VQFP |
TQFP/PDIP |
SOIC/PDIP |
| Max Clock Speed |
33 MHz |
33 MHz |
25 MHz |
| Cascading Support |
Yes |
Yes |
Limited |
Programming and Configuration
JTAG Programming
The device supports IEEE 1149.1 JTAG standard for boundary-scan testing and programming. Standard JTAG programmers compatible with Xilinx devices work seamlessly with the XC18V04VQG44C.
Configuration Modes Explained
Master Serial Mode: The PROM acts as master, controlling the configuration process with internal clock generation.
Slave Serial Mode: An external controller manages clock signals while the PROM provides configuration data.
Parallel Modes: Eight-bit parallel data transfer enables faster configuration times for large FPGA designs.
Quality and Compliance
Industry Standards
The XC18V04VQG44C complies with RoHS (Restriction of Hazardous Substances) directives and meets JEDEC moisture sensitivity level standards. The device undergoes rigorous testing to ensure reliability across its operating temperature range.
Reliability Features
- Endurance: Minimum 10,000 program/erase cycles
- Data Retention: 20+ years at room temperature
- ESD Protection: Human Body Model (HBM) compliant
- Latch-up Immunity: JEDEC compliant
Purchasing Information
Package Marking
The device marking includes the part number XC18V04VQG44C, date code, and lot traceability information for quality assurance and inventory management.
Storage and Handling
Devices are packaged according to electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements. Store in original moisture-barrier bags at room temperature with relative humidity below 70%.
Availability
The XC18V04VQG44C is available through authorized distributors and electronic component suppliers worldwide. Lead times vary based on demand and inventory levels.
Frequently Asked Questions
Q: Can the XC18V04VQG44C replace XC18V04VQ44C? A: Yes, the VQG44C and VQ44C variants are functionally equivalent with minor package variations. Verify mechanical drawings for exact compatibility.
Q: What programming software is compatible? A: Xilinx ISE, Vivado Design Suite, and third-party JTAG programming tools support this device.
Q: Is the device 5V tolerant? A: No, the XC18V04VQG44C operates at 2.5V-3.3V. Exceeding 3.6V may cause permanent damage.
Q: How many devices can be cascaded? A: Multiple PROMs can be cascaded using the CEO (Chip Enable Output) pin for larger configuration storage requirements.
Q: What is the typical power consumption? A: Active current typically measures 30mA at 3.3V, while standby current remains below 200μA.
Conclusion
The XC18V04VQG44C represents a proven solution for FPGA configuration storage, combining reliability, flexibility, and performance in a compact package. Its support for multiple configuration modes, in-system programmability, and industrial-grade specifications make it indispensable for modern electronic systems requiring reconfigurable logic.
Whether designing telecommunications equipment, industrial controllers, automotive systems, or consumer electronics, the XC18V04VQG44C delivers the configuration management capabilities engineers demand. Its robust feature set and compatibility with industry-standard programming tools ensure seamless integration into both new designs and legacy system upgrades.
For more information about FPGA solutions and compatible components, visit our comprehensive Xilinx FPGA resource center.
