XC18V256VQ44I

Overview

The XC18V256VQ44I is a 256-Kbit (262,144-bit) in-system programmable configuration PROM from the Xilinx XC18V00 series. It operates on a 3.3V supply with 5V tolerant I/Os and supports both serial and parallel configuration modes for Xilinx FPGAs. The device features IEEE 1149.1 JTAG support, an endurance of 20,000 program/erase cycles, and data retention of 20 years. It is housed in a 44-pin VQFP package.

Feature Summary

• In-system programmable via standard 4-pin JTAG protocol
• Supports Master Serial, Slave Serial, and Slave-Parallel/SelectMAP FPGA configuration modes
• Features 5V tolerant I/Os compatible with 5V, 3.3V, and 2.5V signals
• Includes advanced data security options to prevent unauthorized reading via JTAG

Applications

• Configuration of Spartan-II and Spartan-IIE FPGAs
• Storing configuration bitstreams for Virtex-II devices
• Cascaded multi-device FPGA configuration systems

Procurement Notes

Verify component authenticity and datasheet version DS026 v3.9. Confirm package type is 44-VQFP (10x10). Check for RoHS non-compliance status if required by environmental regulations. Ensure programming tools support the specific IDCODE 05022093h for this capacity.

Selection Notes

Select this part when configuring FPGAs requiring up to 262,144 configuration bits. Choose the VQ44 package for surface-mount applications. Ensure the design utilizes 3.3V logic levels or leverages the 5V tolerant inputs for mixed-voltage interfaces. Verify compatibility with Xilinx iMPACT software for in-system programming.

Part Context

This component belongs to the XC18V00 series of low-power CMOS FLASH PROMs designed specifically for reprogramming and storing large Xilinx FPGA or CPLD configuration bitstreams. It provides a cost-effective method for system updates without removing the device from the PCB.

Replacement Considerations

Direct substitute: AT17LV002-10TQI (Microchip Technology).