The XC4085XLA-O8BG432I is a high-density, high-performance field-programmable gate array (FPGA) from Xilinx’s XC4000XLA family, distributed by Rochester Electronics. Designed for demanding logic applications, this device offers a powerful combination of gate capacity, speed, and package versatility — making it a go-to solution for engineers working on aerospace, defense, telecommunications, and industrial control systems.

If you are sourcing legacy or long-life-cycle Xilinx FPGA components, the XC4085XLA-O8BG432I is a reliable and fully tested option worth considering.

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What Is the XC4085XLA-O8BG432I?

The XC4085XLA-O8BG432I belongs to Xilinx’s XC4000XLA product line — an advanced generation of the classic XC4000 FPGA architecture. The “XLA” designation indicates an extra-low voltage variant optimized for 3.3V core operation, reduced power consumption, and improved speed compared to earlier XC4000 generations.

Rochester Electronics serves as an authorized distributor and manufacturer for end-of-life (EOL) semiconductors, ensuring that this component remains available for long-term production needs and legacy system support.

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XC4085XLA-O8BG432I Key Specifications

General Product Information

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Logic & Gate Density

The XC4085XLA is one of the larger devices in the XC4000XLA series, offering approximately 85,000 usable equivalent gates — sufficient for complex state machines, signal processing pipelines, and bus interface logic.

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Speed Grade & Timing

The -08 speed grade represents a standard performance tier within the XC4085XLA lineup. For timing-critical designs, faster speed grades may be available; however, the -08 provides a solid balance between cost and performance for most applications.

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Package & Physical Characteristics

The BG432 package is a 432-ball BGA, enabling high I/O density in a compact footprint — ideal for PCB designs where board space is at a premium.

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Electrical Characteristics

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I/O Resources

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Configuration

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Part Number Decoder: XC4085XLA-O8BG432I

Understanding Xilinx’s part numbering scheme helps verify you are ordering exactly the right component.

Note: The variant listed on DigiKey as XC4085XLA-08BG432C carries the “C” suffix (Commercial temperature range, 0°C to +85°C). The “I” suffix in XC4085XLA-O8BG432I denotes the industrial temperature grade, making it suitable for harsher operating environments.

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XC4085XLA-O8BG432I vs. Comparable Variants

The -O8BG432I variant is specifically suited for applications requiring extended temperature operation, such as outdoor industrial equipment, transportation electronics, and military-grade systems.

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Applications for the XC4085XLA-O8BG432I

The XC4085XLA-O8BG432I is commonly deployed across a wide range of industries and application types:

Aerospace & Defense

• Avionics bus interfaces (MIL-STD-1553, ARINC 429)
• Radar signal processing front-end logic
• Long-lifecycle embedded control systems

Industrial Automation

• Motion control and servo drive logic
• Real-time sensor data acquisition
• Factory automation PLC interfaces

Telecommunications

• Protocol bridging and framing
• SDH/SONET interface logic
• Legacy equipment maintenance and extension

Medical Devices

• Imaging system control logic
• Patient monitoring front-end interfaces
• Safety-critical state machines

Embedded Computing

• Custom CPU peripheral logic
• Memory controller implementations
• Coprocessor and hardware accelerator designs

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Why Choose Rochester Electronics for the XC4085XLA-O8BG432I?

Rochester Electronics is an authorized source for Xilinx end-of-life components, meaning every unit is:

• Fully authorized by the original semiconductor manufacturer
• Traceable with complete chain-of-custody documentation
• Tested to original manufacturer specifications
• Counterfeit-free — a critical concern for long-lifecycle industrial and defense procurement

For engineers facing EOL supply challenges, Rochester Electronics provides a trusted, quality-assured supply path.

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Design Considerations

Power Supply Sequencing

The XC4085XLA-O8BG432I requires a stable 3.3V supply before configuration commences. Ensure proper decoupling capacitors (100nF ceramic + 10µF bulk per power domain) are placed close to VCC and VCCO pins.

PCB Layout for BGA432

• Use a minimum 6-layer PCB for reliable BGA fanout
• Maintain 1.0 mm ball pitch design rules (via-in-pad or dog-bone routing)
• Follow Xilinx’s BGA design guidelines for thermal and signal integrity

Configuration Storage

As an SRAM-based FPGA, the XC4085XLA-O8BG432I requires an external configuration memory device (such as an Xilinx XC1736E or compatible serial EEPROM) to load the bitstream at power-up.

Toolchain

The XC4085XLA family is supported by Xilinx ISE Design Suite (Legacy). Note that Vivado does not support the XC4000XLA series. ISE 14.7 is the recommended toolchain for new and maintenance designs.

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Frequently Asked Questions (FAQ)

Q: Is the XC4085XLA-O8BG432I RoHS compliant? Contact your authorized distributor for the specific RoHS status of each lot, as older EOL components may not meet current RoHS requirements.

Q: What is the difference between the “C” and “I” temperature suffixes? The “C” suffix indicates a commercial temperature range (0°C to +85°C), while “I” indicates an industrial temperature range (-40°C to +85°C).

Q: Can I use Vivado to program the XC4085XLA? No. The XC4000XLA series is only supported by Xilinx ISE Design Suite (version 14.7 or earlier).

Q: Is this part still in production? The XC4085XLA series has been declared end-of-life by AMD/Xilinx. Rochester Electronics provides authorized, tested inventory for continued production needs.

Q: What configuration mode is most commonly used? Master Serial mode, using an external serial configuration PROM, is the most common configuration method for this device family.

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Summary

The XC4085XLA-O8BG432I is a robust, industrial-grade FPGA delivering approximately 85,000 equivalent gates in a 432-ball BGA package with an -8 ns speed grade and extended industrial temperature operation. It is an excellent choice for engineers maintaining legacy systems or requiring a proven, long-lifecycle FPGA solution from a trusted authorized source.

For procurement inquiries, technical documentation, and inventory availability, contact your authorized distributor directly.