The XC4085XLA-08HQ160I is a high-performance Field Programmable Gate Array (FPGA) from Xilinx’s XC4000XLA family, distributed by Rochester Electronics. Featuring 85,000 gates, 7,448 logic cells, and a compact 160-pin HSPQFP package, this FPGA is engineered for demanding embedded applications that require low power, high-speed logic, and industrial-grade reliability. Whether you are designing communications equipment, industrial control systems, or military-grade electronics, the XC4085XLA-08HQ160I delivers the flexibility and performance required by modern digital systems.

If you are sourcing Xilinx FPGA components for your next design, this guide covers everything you need — specifications, pin details, operating conditions, applications, and ordering information.

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What Is the XC4085XLA-08HQ160I?

The XC4085XLA-08HQ160I belongs to Xilinx’s XC4000XLA/XV FPGA family, manufactured using a 0.35µm CMOS process technology. The “XLA” designation refers to the extended low-voltage architecture variant, which operates at 3.3V and is optimized for lower power consumption while maintaining high gate density and speed performance.

The part number breaks down as follows:

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XC4085XLA-08HQ160I Key Specifications

The table below summarizes the core electrical and physical specifications of the XC4085XLA-08HQ160I:

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XC4085XLA-08HQ160I Package and Pin Information

The XC4085XLA-08HQ160I is housed in a 160-pin Heat Slug Plastic Quad Flat Package (HSPQFP). This package type is designed for robust thermal management in high-density PCB environments. The heat slug on the underside of the package efficiently dissipates heat generated by the internal logic core, making it well-suited for industrial environments.

Pin Function Summary

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XC4085XLA-08HQ160I Electrical Characteristics

Understanding the electrical parameters is critical for correct circuit design. The table below highlights the key electrical characteristics of this FPGA:

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XC4000XLA Architecture Overview

The XC4085XLA-08HQ160I is built on Xilinx’s mature XC4000XLA architecture, which provides a rich set of programmable resources for complex digital design. The key architectural features include:

Configurable Logic Blocks (CLBs)

Each CLB consists of two independent 4-input function generators (look-up tables), carry logic for fast arithmetic, and two flip-flops. CLBs can implement a wide variety of logic functions, from simple combinational logic to complex state machines.

Dedicated Routing Resources

The XC4000XLA routing architecture features a hierarchical structure of local, long-line, and direct connections. This provides efficient routing for both high-speed point-to-point signals and distributed logic functions.

On-Chip RAM

The CLBs can be configured as distributed synchronous single-port or dual-port RAM, enabling flexible on-chip data storage without the need for external memory devices in many applications.

Boundary Scan (JTAG)

The device supports the IEEE 1149.1 JTAG standard, enabling in-system testing, programming, and debugging directly on the PCB without physical test probes.

Clock Distribution

The FPGA includes dedicated global clock buffers and clock routing networks, supporting up to four global clock signals with minimal skew across the entire device.

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XC4085XLA-08HQ160I vs. Similar XC4085XLA Variants

Engineers often need to compare part variants to find the best fit for their design constraints. The table below compares the XC4085XLA-08HQ160I with closely related parts:

The -08 speed grade version offers a balanced mix of performance and power, positioned between the slower -09 and faster -07 variants. The 160-pin package provides a more compact footprint than the 240-pin or 432-pin BGA variants, which is advantageous in space-constrained PCB designs.

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Applications of the XC4085XLA-08HQ160I

The combination of 85K gates, 227 MHz maximum frequency, industrial temperature tolerance, and a compact package makes the XC4085XLA-08HQ160I suitable for a wide range of demanding applications:

Industrial Automation and Control

The FPGA’s high gate count and real-time processing capabilities are ideal for PLC (Programmable Logic Controller) systems, motion control, robotics, and factory automation. Its industrial temperature range ensures reliable operation in harsh environments.

Communications and Networking

The XC4085XLA-08HQ160I can implement high-speed serial and parallel communication protocols including UART, SPI, I²C, Ethernet MAC, and proprietary bus interfaces. It is well-suited for protocol bridging, signal routing, and data processing in telecom and networking equipment.

Defense and Aerospace

The industrial-grade temperature range (–40°C to +85°C) and proven Xilinx XC4000XLA architecture make this FPGA a strong candidate for military communications, avionics, radar processing, and electronic warfare (EW) systems. Rochester Electronics also provides long-term supply assurance, which is critical for defense program lifecycles.

Medical Imaging and Diagnostics

High-speed data acquisition and processing requirements in ultrasound, CT scanners, and diagnostic imaging platforms benefit from the FPGA’s flexible I/O and programmable logic resources.

Test and Measurement Equipment

FPGAs like the XC4085XLA-08HQ160I are widely used in oscilloscopes, logic analyzers, and signal generators where real-time data processing and flexible interfacing are essential.

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Ordering Information and Availability

The XC4085XLA-08HQ160I is a Rochester Electronics stocked part, offering long-term availability for production and legacy system support.

Note: As a legacy Xilinx product, the XC4085XLA-08HQ160I may have limited new stock. Rochester Electronics specializes in providing authorized, traceable supply for end-of-life (EOL) and legacy semiconductors, making them the preferred source for this component.

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Why Choose Rochester Electronics for XC4085XLA-08HQ160I?

Rochester Electronics is an authorized source for legacy Xilinx products, with full licensing agreements and chain-of-custody traceability. When sourcing discontinued or end-of-life components like the XC4085XLA-08HQ160I, authorized distributors offer critical advantages:

• Authenticity guarantee – All parts are sourced directly from original manufacturer inventory or under license
• Long-term supply assurance – Suitable for programs with multi-year production requirements
• Full traceability – Documentation and material certifications available
• Technical support – Access to original design documentation and datasheets

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Programming and Design Tools

The XC4085XLA-08HQ160I is supported by Xilinx ISE Design Suite (legacy tool). Since this is an older-generation FPGA, it is not supported in Vivado. Designers should use:

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Frequently Asked Questions (FAQ)

Q: What is the maximum operating frequency of the XC4085XLA-08HQ160I?
A: The device supports a maximum operating frequency of 227 MHz under typical operating conditions.

Q: Is the XC4085XLA-08HQ160I RoHS compliant?
A: No. This is a legacy device and is not RoHS compliant. It contains lead (Pb) in the solder finish.

Q: What is the operating voltage of the XC4085XLA-08HQ160I?
A: The device operates from a 3.0V to 3.6V supply voltage, with a nominal voltage of 3.3V.

Q: What design software supports this FPGA?
A: The XC4085XLA-08HQ160I is supported by Xilinx ISE Design Suite 14.7, the final version of the ISE toolchain.

Q: Can the XC4085XLA-08HQ160I be used in automotive or aerospace applications?
A: Yes. Its industrial temperature range (–40°C to +85°C) and proven architecture make it suitable for aerospace, defense, and ruggedized industrial applications. For automotive AEC-Q100 grade requirements, verify with your distributor.

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Conclusion

The XC4085XLA-08HQ160I is a proven, high-gate-count FPGA from Xilinx’s XC4000XLA family that continues to serve legacy and long-lifecycle applications across industrial, defense, medical, and communications sectors. With 85,000 gates, 7,448 logic cells, a 227 MHz maximum frequency, industrial temperature rating, and a compact 160-pin HSPQFP package, it offers a reliable and flexible programmable logic solution.

For engineers maintaining legacy systems or designing new systems that require proven long-term component availability, the XC4085XLA-08HQ160I sourced through Rochester Electronics represents a dependable, authorized supply chain option.