The XC18V02-VQ44I is a high-performance 2-megabit in-system programmable configuration PROM manufactured by AMD (formerly Xilinx). This industrial-grade EEPROM device provides a reliable, cost-effective solution for storing and reprogramming Xilinx FPGA configuration bitstreams in demanding applications.
XC18V02-VQ44I Overview and Key Features
The XC18V02-VQ44I belongs to the XC18V00 series of 3.3V in-system programmable configuration PROMs. Designed specifically for FPGA configuration memory applications, this device offers exceptional flexibility with dual configuration modes supporting both serial and parallel data output.
Primary Features of XC18V02-VQ44I
- Memory Density: 2 Megabit (256K × 8) configuration storage
- In-System Programmable: Reprogram without removing the device
- Industrial Temperature Rating: Full operation from -40°C to +85°C
- High Endurance: 20,000 program/erase cycles guaranteed
- Data Retention: Minimum 20 years of reliable data storage
- Low-Power CMOS FLASH Process: Energy-efficient operation
XC18V02-VQ44I Technical Specifications
Electrical Characteristics
| Parameter |
Specification |
| Supply Voltage (VCCINT) |
3.0V to 3.6V |
| I/O Voltage Compatibility |
5V, 3.3V, 2.5V tolerant |
| Output Capability |
3.3V or 2.5V selectable |
| Maximum Clock Frequency |
33 MHz |
| Serial Data Rate |
Up to 33 Mb/s |
| Parallel Data Rate |
Up to 264 Mb/s at 33 MHz |
Package and Physical Parameters
| Specification |
Value |
| Package Type |
44-VQFP (Thin Quad Flat Pack) |
| Package Dimensions |
10mm × 10mm |
| Pin Count |
44 pins |
| Pin Pitch |
0.8mm |
| Mounting Type |
Surface Mount (SMD) |
| Lead-Free Option |
Available (Pb-Free packaging) |
Operating Conditions
| Parameter |
Industrial Grade (I) |
| Operating Temperature |
-40°C to +85°C |
| Storage Temperature |
-65°C to +150°C |
| Program/Erase Temperature |
-40°C to +85°C |
XC18V02-VQ44I Configuration Modes
The XC18V02-VQ44I supports multiple FPGA configuration modes, providing design flexibility for various system architectures.
Serial Configuration Mode
In serial configuration mode, the PROM outputs data through the D0 pin connected to the FPGA DIN pin. The device supports both slow and fast serial modes with clock frequencies up to 33 MHz.
Parallel Configuration Mode
The parallel mode utilizes all eight data pins (D0-D7) for high-speed configuration, achieving data transfer rates up to 264 Mb/s when operating at 33 MHz clock frequency.
Supported FPGA Configuration Schemes
| Mode |
Description |
| Master Serial |
FPGA generates configuration clock |
| Slave Serial |
External clock drives PROM and FPGA |
| Master SelectMAP |
FPGA-generated clock, parallel data |
| Slave SelectMAP |
External clock, parallel data output |
XC18V02-VQ44I Pin Configuration
Key Pin Functions
| Pin Name |
Function |
| D[0:7] |
Data output pins (serial uses D0 only) |
| CLK |
Configuration clock input |
| CE |
Chip Enable (active low) |
| OE/RESET |
Output Enable / Reset |
| CEO |
Chip Enable Output for cascading |
| CF |
Configuration control |
| TDI, TDO, TMS, TCK |
JTAG interface pins |
| VCCINT |
Internal power supply (3.3V) |
| GND |
Ground connections |
JTAG Programming and Boundary-Scan Support
The XC18V02-VQ44I features full IEEE Std 1149.1 Boundary-Scan (JTAG) compliance, enabling in-system programming and device testing through the standard four-wire JTAG interface.
JTAG Capabilities
- In-system programming via JTAG port
- Command initiation of standard FPGA configuration
- Boundary-scan testing support
- Device identification through IDCODE register
- Optional JTAG read security protection
Cascading Multiple XC18V02-VQ44I Devices
For applications requiring larger bitstream storage, multiple XC18V02-VQ44I devices can be cascaded together using the CEO (Chip Enable Output) to drive the CE input of subsequent devices.
Cascading Features
- Seamless daisy-chain configuration
- Compatible with XC18V00 family members (XC18V01, XC18V04, XC18V512)
- Compatible with XC17V00 one-time programmable PROMs
- Shared clock and data bus architecture
Compatible FPGA Families
The XC18V02-VQ44I configuration PROM is compatible with a wide range of Xilinx FPGA families.
| FPGA Family |
Compatibility |
| Spartan Series |
Spartan-II, Spartan-IIE, Spartan-3 |
| Virtex Series |
Virtex, Virtex-E, Virtex-II, Virtex-II Pro |
| XC4000 Series |
XC4000E, XC4000EX, XC4000XL, XC4000XV |
| CoolRunner |
XC9500, XC9500XV CPLDs |
Design Software Support
The XC18V02-VQ44I is fully supported by Xilinx development tools for seamless integration into your design workflow.
Supported Design Tools
- Xilinx ISE Foundation Software
- Xilinx iMPACT Programming Software
- Vivado Design Suite (legacy support)
- Third-party JTAG programming tools
XC18V02-VQ44I Part Number Decoder
Understanding the XC18V02-VQ44I part number helps identify device specifications.
| Segment |
Meaning |
| XC18V |
Product family (18V series PROM) |
| 02 |
Density (2 Megabit) |
| VQ |
Package type (VQFP – Thin Quad Flat Pack) |
| 44 |
Pin count |
| I |
Temperature grade (Industrial: -40°C to +85°C) |
Applications for XC18V02-VQ44I
The XC18V02-VQ44I configuration PROM is ideal for various industrial and commercial applications.
Typical Use Cases
- Industrial automation and control systems
- Telecommunications equipment
- Medical device electronics
- Automotive electronics
- Aerospace and defense systems
- Test and measurement instrumentation
- Network infrastructure equipment
- Consumer electronics with FPGA-based designs
Ordering Information
| Part Number |
Description |
| XC18V02-VQ44I |
2Mb PROM, 44-VQFP, Industrial temp (-40°C to +85°C) |
| XC18V02-VQ44C |
2Mb PROM, 44-VQFP, Commercial temp (0°C to +70°C) |
| XC18V02VQ44I |
Alternate part number format (same device) |
Why Choose XC18V02-VQ44I for Your FPGA Design
The XC18V02-VQ44I offers several advantages for FPGA configuration storage in demanding applications. The industrial temperature rating ensures reliable operation in harsh environments, while the 5V-tolerant I/O pins provide flexibility when interfacing with legacy 5V systems. The high endurance rating of 20,000 program/erase cycles makes it suitable for applications requiring frequent updates, and the 20-year data retention guarantee ensures long-term reliability.
Summary
The XC18V02-VQ44I is a versatile, industrial-grade 2-megabit in-system programmable configuration PROM designed for FPGA bitstream storage. With its dual configuration modes, JTAG programming support, wide voltage tolerance, and extended temperature range, this device delivers reliable performance for mission-critical applications across multiple industries.
