The XC4085XLA-09BG352I is a high-performance Field-Programmable Gate Array (FPGA) from Xilinx’s XC4000XLA family, now maintained under AMD’s Adaptive and Embedded Computing Group. Designed for complex, high-density logic applications, this device delivers 85,000 gates and operates at up to 227 MHz — making it a reliable choice for industrial, aerospace, and embedded systems design.

Whether you are sourcing legacy parts for system maintenance or evaluating it for a new application, this guide provides the complete specifications, electrical characteristics, and use-case information you need. For a full range of compatible programmable logic devices, visit our Xilinx FPGA catalog.

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What Is the XC4085XLA-09BG352I?

The XC4085XLA-09BG352I belongs to the XC4000XLA/XV family, a series of high-capacity FPGAs built on a 0.35 µm CMOS process. The XC4000XLA generation was developed to combine architectural versatility, abundant routing resources, and high-speed logic — all within a 3.3V supply environment. It is distributed by Rochester Electronics LLC and is available as a tray-packaged component.

The part number breaks down as follows:

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XC4085XLA-09BG352I Key Specifications

The table below summarizes the core electrical and physical specifications for the XC4085XLA-09BG352I.

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XC4085XLA-09BG352I Electrical Characteristics

Supply Voltage and Power

The XC4085XLA-09BG352I operates from a single 3.3V VCC supply. Unlike some other XLA/XV devices that use separate VCCIO and VCCINT supplies, all I/O signalling on this device is supported via a unified 3.3V rail. This simplifies board-level power design while maintaining compatibility with a wide range of I/O standards.

I/O Standards Supported

Clock Resources

The device includes eight global low-skew clock networks plus FastCLK buffers on the left and right die edges, each providing fast clock signals to I/O blocks within their respective octants. This ensures precise timing synchronization across all logic blocks and supports demanding, multi-clock designs.

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XC4085XLA-09BG352I Architecture Overview

Configurable Logic Blocks (CLBs)

The CLB is the fundamental logic building unit. Each CLB in the XC4085XLA contains:

• Two independent 4-input function generators (F and G)
• Internal multiplexers for flexible signal routing
• Edge-triggered flip-flops with set/reset support
• On-chip dual-port and edge-triggered RAM capability

This architecture enables highly synthesis-compatible, versatile designs. Logic functions can be implemented without restriction, and the on-chip RAM support makes the device well-suited for embedded memory structures, FIFOs, and data buffering.

Routing Resources

The XC4085XLA uses a low-power segmented routing fabric with abundant interconnect paths. This gives designers flexibility in placement and routing and reduces the need for manual timing constraints in typical applications.

JTAG Boundary Scan

The device supports IEEE 1149.1 JTAG boundary scan, enabling in-system testing, fault isolation, and board-level diagnostics without physical probing. Configuration readback is also supported, which is valuable during prototyping and system verification. The part supports unlimited reprogramming.

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XC4085XLA-09BG352I Package Information

The 352-pin BGA footprint provides a compact, high-density interconnect suitable for boards where space is at a premium. Designers integrating this device should ensure proper PCB design rules for BGA pad layout, solder mask, and via-in-pad considerations.

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Applications of the XC4085XLA-09BG352I

The XC4085XLA-09BG352I has been widely deployed across demanding markets that require reliable, programmable logic:

The combination of 85,000 logic gates, a fast –09 speed grade, and industrial temperature rating makes this part especially useful in environments requiring both performance and long-term availability.

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Ordering and Availability

The XC4085XLA-09BG352I is classified as an obsolete/legacy part, distributed by Rochester Electronics LLC, which specializes in lifecycle management of end-of-life semiconductors. Buyers sourcing this component should verify stock availability and lead times with authorized distributors.

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XC4085XLA-09BG352I vs. Related Variants

Xilinx offered the XC4085XLA in multiple packages and speed grades. The table below compares common variants to help you select the best fit for your application.

The 352-pin BGA variant (this part) offers a balanced mix of I/O count and board footprint, while the 432-pin BGA variant provides additional I/O flexibility for more complex designs.

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Design Tools and Software Support

The XC4085XLA-09BG352I is supported by legacy Xilinx design toolchains. Designers working with this device should use:

• Xilinx ISE Design Suite (recommended for XC4000-series devices)
• Alliance Series (legacy Xilinx implementation tools for the XC4000XLA family)

Note: The Xilinx Vivado Design Suite does not support legacy XC4000-series FPGAs. For new designs, consider migrating to a current-generation Xilinx FPGA platform, while using ISE for all work with the XC4085XLA-09BG352I.

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Summary

The XC4085XLA-09BG352I is a proven, high-gate-count FPGA with strong logic density, flexible I/O standards, and robust clock distribution — designed for complex embedded applications in industrial and mission-critical environments. As a legacy device, it is primarily sourced through specialty distributors for system maintenance, board repair, and long-life production needs.