The XC4085XLA-O8BG352I is a high-density, high-performance Field Programmable Gate Array (FPGA) from Xilinx’s XC4000XLA family. Designed for demanding industrial and embedded applications, this device combines 85,000 logic gates, a 352-pin BGA package, and an industrial temperature rating — making it a reliable choice for engineers sourcing legacy or long-lifecycle programmable logic solutions.

Whether you are maintaining an existing design, prototyping a new system, or replacing an end-of-life component, the XC4085XLA-O8BG352I delivers the performance, flexibility, and proven reliability of Xilinx’s XC4000XLA architecture.

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What Is the XC4085XLA-O8BG352I? Overview and Key Highlights

The XC4085XLA-O8BG352I belongs to Xilinx’s XC4000XLA/XV family — a generation of FPGAs built on 0.35 µm CMOS technology and optimized for 3.3V operation. The “O8” speed grade indicates a maximum operating frequency of approximately 263 MHz, while the “I” suffix confirms an industrial temperature range of –40°C to +100°C.

This part number breaks down as follows:

For engineers working with Xilinx FPGA designs, the XC4085XLA-O8BG352I offers a compact, high-pin-count solution in a standard BGA footprint compatible with existing PCB layouts across the XC4000XLA lineup.

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XC4085XLA-O8BG352I Technical Specifications

Core Electrical and Logic Parameters

Package and Physical Specifications

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XC4085XLA-O8BG352I Features and Architecture

#### High-Density Configurable Logic

The XC4085XLA-O8BG352I provides 7,448 logic cells organized into Configurable Logic Blocks (CLBs). Each CLB contains flexible function generators and flip-flops, enabling efficient implementation of complex state machines, data paths, and control logic. The high gate count makes this device well-suited for replacing multiple discrete logic ICs or smaller FPGAs in a single chip.

#### Select-RAM™ Embedded Memory

The device integrates Xilinx’s Select-RAM™ technology, which provides on-chip, ultra-fast RAM with dual-port and synchronous write options. This embedded memory is ideal for:

• FIFO buffers and data queues
• Lookup tables and coefficient storage
• Local scratchpad memory in DSP pipelines
• Embedded RAM structures without external memory

#### High-Speed Carry Logic and Arithmetic

Dedicated high-speed carry chains within the CLB fabric enable efficient implementation of arithmetic functions such as adders, accumulators, and multipliers — without consuming additional routing resources or compromising timing.

#### Eight Global Clock Networks

The XC4085XLA-O8BG352I features eight global low-skew clock distribution networks, allowing designers to implement multi-clock domain designs with minimal clock skew across the entire device. This is critical for synchronous designs requiring multiple clock sources.

#### IEEE 1149.1 Boundary Scan (JTAG)

Full IEEE 1149.1 JTAG boundary scan support is included, enabling in-system programming, board-level testing, and design verification without removing the device from the PCB. This significantly reduces debug time and supports automated test equipment (ATE) environments.

#### Programmable I/O Flexibility

#### Low-Power Segmented Routing Architecture

The XC4000XLA family employs a segmented routing architecture that minimizes power consumption by reducing unnecessary signal switching on long routing lines. This makes the XC4085XLA-O8BG352I suitable for power-sensitive industrial applications.

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XC4085XLA-O8BG352I vs. Related Part Numbers

Engineers evaluating this component should understand how it compares to closely related variants within the XC4085XLA family:

The XC4085XLA-O8BG352I is differentiated by its speed grade –08 (263 MHz) and the compact BG352 package, making it the preferred option when board space is constrained and industrial-grade reliability is required.

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Typical Applications for the XC4085XLA-O8BG352I

The XC4085XLA-O8BG352I FPGA is widely used across a broad range of industries and application domains:

#### Industrial Automation and Control

• Programmable machine controllers and motor drives
• Real-time sensor data processing
• Industrial communication protocol bridges (PROFIBUS, CAN, EtherCAT)
• Factory automation and robotics control logic

#### Aerospace and Defense

• Avionics signal processing
• Ruggedized embedded computing systems
• Radar and electronic warfare signal chains
• Secure communications hardware

#### Enterprise and Datacom Systems

• High-speed serial interface controllers
• Network switching fabric logic
• Data path processing and error correction
• FPGA-based network interface cards (NICs)

#### ASIC Prototyping and Design Verification

The large gate count and reprogrammable architecture make the XC4085XLA-O8BG352I an excellent platform for ASIC emulation, allowing engineers to validate RTL designs in hardware before committing to silicon fabrication.

#### Embedded Systems and DSP

• Digital signal processing pipelines
• Image and video processing
• Custom co-processors for embedded CPUs
• High-speed data acquisition systems

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Programming and Design Tool Support

The XC4085XLA-O8BG352I is supported by Xilinx ISE Design Suite, Xilinx’s legacy toolchain for the XC4000 device family. Design entry supports both VHDL and Verilog hardware description languages.

To program the XC4085XLA-O8BG352I via JTAG, connect a compatible Xilinx Platform Cable to the JTAG header on your board, then use iMPACT to download the configuration bitstream generated by ISE.

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Why Choose the XC4085XLA-O8BG352I?

• 85,000 logic gates in a compact 352-pin BGA footprint — high density, small PCB footprint
• Speed grade –08 (~263 MHz) — faster than the common –09 variant, enabling more timing margin
• Industrial temperature rating — guaranteed operation from –40°C to +100°C for harsh environments
• Proven XC4000XLA architecture — battle-tested in thousands of designs worldwide
• JTAG boundary scan — simplifies in-circuit test and manufacturing debug
• Unlimited reprogrammability — iterate quickly during development and field updates
• Rochester Electronics sourced — available through authorized distributors for long-lifecycle supply assurance

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Ordering Information

Contact your authorized Xilinx distributor or visit your preferred component marketplace to check current stock, pricing, and lead times for the XC4085XLA-O8BG352I.

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Frequently Asked Questions (FAQ)

Q: What is the difference between XC4085XLA-O8BG352I and XC4085XLA-09BG352I?
The primary difference is the speed grade. The –O8 variant operates at approximately 263 MHz, while the –09 variant is rated at approximately 227 MHz. Both share the same 352-pin BGA package and industrial temperature range.

Q: Is the XC4085XLA-O8BG352I still in production?
The XC4085XLA family is a legacy Xilinx product. Rochester Electronics LLC maintains authorized supply of this part for long-lifecycle and end-of-life support applications.

Q: What design tools are compatible with the XC4085XLA-O8BG352I?
Xilinx ISE Design Suite is the primary supported toolchain. VHDL and Verilog design entry are both supported.

Q: What is the supply voltage for the XC4085XLA-O8BG352I?
The device operates from a 3.3V supply voltage.

Q: Is the XC4085XLA-O8BG352I RoHS compliant?
This legacy device is generally listed as non-RoHS compliant. Confirm compliance requirements with your distributor before placing orders for restricted markets.