Part Number: XC4085XLA-08BG432C
Manufacturer: AMD Xilinx (Rochester Electronics)
Category: Field Programmable Gate Array (FPGA)
Family: XC4000XLA
Package: 432-Pin BGA
Speed Grade: –08 (263 MHz)
Supply Voltage: 3.3V

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What Is the XC4085XLA-08BG432C?

The XC4085XLA-08BG432C is a high-density, high-performance Field Programmable Gate Array (FPGA) from the Xilinx XC4000XLA family, now supported under AMD’s Adaptive and Embedded Computing Group. Designed for complex digital logic applications, this device delivers 85,000 system gates and 7,448 logic cells in a 432-pin BGA package, operating at 3.3V with a –08 speed grade that supports clock frequencies up to 263 MHz.

Built on a proven 0.35 µm CMOS process, the XC4085XLA-08BG432C offers a compelling balance of gate density, routing flexibility, and I/O versatility. It is widely used in legacy industrial systems, communications hardware, data processing boards, and embedded computing applications where proven, reliable programmable logic is required.

For engineers and procurement teams seeking high-capacity, legacy-compatible Xilinx FPGA solutions, this part remains one of the most capable devices in the XC4000XLA lineup.

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XC4085XLA-08BG432C Key Specifications

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XC4085XLA-08BG432C Detailed Features

#### High-Density Logic Architecture

The XC4085XLA-08BG432C contains 3,136 Configurable Logic Blocks (CLBs), each consisting of two independent function generators with look-up tables (LUTs), flip-flops, and internal multiplexers. This architecture supports a wide range of logic functions, from simple combinational gates to complex finite state machines and arithmetic circuits. The CLB-based design allows designers to implement highly customized digital logic without the NRE costs of an ASIC.

#### High-Speed 263 MHz Operation

With a –08 speed grade, this FPGA supports system clock frequencies up to 263 MHz, enabling time-critical applications such as high-speed data communication, digital signal processing pipelines, and real-time control systems. The device’s low-skew global clock network ensures consistent timing distribution across all CLBs.

#### 432-Pin BGA Package for High Pin-Count Designs

The 432-pin BGA package provides a large number of user I/O pins, making the XC4085XLA-08BG432C suitable for data-intensive applications requiring wide buses, parallel interfaces, and dense interconnects. The BGA footprint also offers improved signal integrity compared to equivalent QFP packages due to shorter lead lengths.

#### Flexible I/O Standards and Drive Strength

The device supports multiple I/O standards including 5V TTL, 3.3V LVTTL, and PCI-compatible signaling. User-configurable output drive strength of 12 mA or 24 mA per pin allows designers to tune signal integrity for specific load conditions. Programmable slew rate control further reduces EMI in high-speed switching applications.

#### 8 Global Low-Skew Clock Networks

Eight dedicated global clock networks distribute clock signals with minimal skew across the entire device. This feature is critical for synchronous designs with multiple clock domains, ensuring reliable setup and hold time margins throughout the logic fabric.

#### IEEE 1149.1 JTAG Boundary Scan

The XC4085XLA-08BG432C supports IEEE 1149.1 JTAG boundary scan, enabling in-system testing and debugging without requiring physical access to individual pins. This simplifies board-level fault isolation and accelerates bring-up and production test procedures.

#### Unlimited Reprogrammability

As a SRAM-based FPGA, the XC4085XLA-08BG432C supports unlimited reprogramming, giving design teams the flexibility to iterate on logic without hardware changes. Configuration can be reloaded at power-up from an external configuration memory device.

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XC4085XLA-08BG432C vs. Other Speed Grades — Comparison Table

Note: Lower speed-grade numbers indicate faster devices. The –07 variant is the fastest and the –09 is the slowest in the BG432 package lineup.

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XC4085XLA-08BG432C Package Information

The 432-pin BGA offers higher routing density than QFP alternatives, with pads arranged in a grid array beneath the device body. This facilitates compact PCB layouts and reduces parasitic inductance on high-speed signal paths.

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Typical Applications of the XC4085XLA-08BG432C

The XC4085XLA-08BG432C is well-suited for a broad range of application domains:

• Industrial Control Systems – Implementing custom state machines, motor control logic, and real-time I/O interfaces
• Telecommunications Equipment – Protocol processing, framing logic, and backplane interface controllers
• Data Acquisition and Signal Processing – Parallel data capture, FIFOs, and pre-processing pipelines
• Military and Aerospace (Legacy Systems) – Long-lifecycle embedded logic for defense electronics requiring obsolescence management
• Medical Electronics – Configurable logic for diagnostic instrumentation and imaging hardware
• Embedded Computing Boards – Glue logic, bus bridging, and custom peripheral controllers

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Why Choose the XC4085XLA-08BG432C?

#### Proven XC4000XLA Architecture

The XC4000XLA family represents over a decade of accumulated FPGA design experience from Xilinx. Its CLB-based architecture has been validated in millions of deployed systems worldwide, offering predictable performance and well-documented toolchain support.

#### 0.35 µm CMOS Process for Low Power and High Reliability

The advanced 0.35 µm CMOS fabrication process delivers lower static and dynamic power consumption compared to older process nodes, while maintaining the gate density required for complex logic designs. This translates to reduced thermal management requirements and longer operational lifetimes in deployed systems.

#### Legacy System Compatibility

For engineers maintaining or upgrading systems originally designed with XC4000-series devices, the XC4085XLA-08BG432C provides pin-compatible replacement options across the XC4000XLA family. Rochester Electronics distributes verified, manufacturer-authorized stock to support long-term procurement needs.

#### Wide I/O Flexibility

Support for both 5V and 3.3V I/O standards means the XC4085XLA-08BG432C can interface directly with a wide range of legacy and modern peripheral devices, reducing the need for external level-shifting components.

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Ordering Information

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Frequently Asked Questions (FAQ)

Q: What is the maximum operating frequency of the XC4085XLA-08BG432C?
A: The –08 speed grade supports clock frequencies up to 263 MHz under standard operating conditions.

Q: Is the XC4085XLA-08BG432C RoHS compliant?
A: No. This part is not RoHS compliant. Engineers requiring lead-free alternatives should consult authorized distributors for equivalent RoHS-compliant variants.

Q: What software tools are compatible with the XC4085XLA-08BG432C?
A: The XC4000XLA family is supported by Xilinx ISE Design Suite. While Xilinx Vivado supports newer device families, ISE remains the primary toolchain for XC4000-series devices.

Q: What is the difference between XC4085XLA-08BG432C and XC4085XLA-09BG432C?
A: The primary difference is speed grade. The –08 device supports up to 263 MHz, while the –09 is rated for up to 227 MHz. Both share the same 432-pin BGA package, 85K gate density, and 3.3V supply voltage.

Q: Can the XC4085XLA-08BG432C be used in new designs?
A: While the XC4000XLA family is considered a legacy product, it remains an excellent choice for new designs requiring long lifecycle support, existing board compatibility, or proven architecture with well-established tooling.