XQ18V04VQ44N

Overview

The XQ18V04VQ44N is a military-grade, 4 Mbit in-system programmable configuration Flash PROM designed for Xilinx FPGAs. It operates within a temperature range of –55 °C to +125 °C and utilizes a low-power advanced CMOS FLASH process immune to static single event upset. The device supports dual configuration modes: serial (up to 20 MHz) and parallel (up to 160 Mbps at 20 MHz). It features 5V tolerant I/O pins accepting 5V, 3.3V, and 2.5V signals, with output capabilities of 3.3V or 2.5V. Packaged exclusively in plastic VQ44, it ensures reliable non-volatile storage for FPGA bitstreams in demanding environments.

Feature Summary

• Military-grade reliability with operation across the full –55 °C to +125 °C temperature range
• In-system programmability via standard 4-pin JTAG protocol for efficient design iterations
• Dual configuration support including serial and high-speed parallel modes
• 5V tolerant I/Os allowing direct connection to 5V, 3.3V, and 2.5V systems without damage

Applications

• Configuration of Xilinx Virtex, Virtex-E, and Spartan FPGAs in Master Serial mode
• Configuration of Xilinx FPGAs in SelectMAP or Express modes using parallel data outputs
• Cascaded configurations for storing longer bitstreams or configuring multiple FPGAs in a daisy-chain
• JTAG-initiated FPGA configuration through the CF pin interface

Procurement Notes

Verify that the specific suffix 'N' denotes the Military grade variant with the –55 °C to +125 °C operating range as specified in the ordering table. Confirm the package type is the 44-pin Plastic Thin Quad Flat Package (VQ44). Ensure compatibility with the target Xilinx FPGA family regarding voltage levels and configuration mode requirements before procurement.

Selection Notes

Select this component when military-grade environmental tolerance is required for FPGA configuration memory. It is suitable for applications needing in-system reprogrammability via JTAG. Consider cascading multiple units if the FPGA configuration bitstream exceeds the 4 Mbit capacity. Verify that the system supports the required 3.3V or 2.5V VCCO supply voltages for output drivers.

Part Context

The XQ18V04 series belongs to Xilinx's QPro™ line of military-grade configuration PROMs. These devices provide non-volatile storage for FPGA configuration bitstreams. The XQ18V04 specifically offers 4 Mbit capacity, supporting complex FPGAs like the XQV600 or XQ2V1000. It replaces older one-time programmable PROMs by offering rewritable functionality while maintaining military reliability standards.

Replacement Considerations

The XQR1701L and XQR17V16 are compatible one-time programmable configuration PROMs that can be used in similar designs. However, they lack the in-system programmability feature of the XQ18V04. When replacing, ensure the new device supports the required configuration mode and voltage levels.