The XC4085XLA-O8BGG432I is a high-density, low-voltage field-programmable gate array (FPGA) from Xilinx’s XC4000XLA family. Designed for demanding industrial and commercial applications, this device delivers exceptional logic density, advanced I/O flexibility, and reliable operation in extended temperature environments. Whether you are designing embedded systems, communications hardware, or digital signal processing circuits, the XC4085XLA-O8BGG432I provides the programmable logic resources to meet your requirements.
For engineers seeking a broad portfolio of programmable logic solutions, explore our full range of Xilinx FPGA products.
XC4085XLA-O8BGG432I Key Specifications at a Glance
| Parameter |
Value |
| Manufacturer Part Number |
XC4085XLA-O8BGG432I |
| Manufacturer |
Xilinx (now AMD) |
| Family |
XC4000XLA |
| Package |
432-Ball BGA (BG432) |
| Logic Cells |
~85,000 (equivalent) |
| Speed Grade |
-08 |
| Supply Voltage (VCC) |
2.5V (XLA low-voltage series) |
| I/O Voltage |
3.3V tolerant |
| Temperature Range |
Industrial (-40°C to +85°C) |
| Operating Frequency |
Up to 80 MHz (speed grade dependent) |
| Configuration Interface |
Master/Slave Serial, SelectMAP |
| RoHS Status |
Consult manufacturer |
What Is the XC4085XLA-O8BGG432I?
The XC4085XLA-O8BGG432I is a member of Xilinx’s XC4000XLA architecture — an advanced evolution of the classic XC4000 FPGA family optimized for lower core voltages (2.5V) without sacrificing performance. The “XLA” designation refers to the extended low-voltage architecture, which reduces power consumption compared to standard 5V and 3.3V predecessors while maintaining compatibility with 3.3V I/O standards.
The part number suffix breakdown is as follows:
| Segment |
Meaning |
| XC4085 |
85K-gate-equivalent logic density |
| XLA |
Extended Low-voltage Architecture (2.5V core) |
| -O8 |
Speed grade -08 (commercial to industrial) |
| BG |
Ball Grid Array package type |
| G432 |
432-ball BGA package |
| I |
Industrial temperature range (-40°C to +85°C) |
XC4085XLA-O8BGG432I Architecture and Logic Resources
Configurable Logic Blocks (CLBs)
The XC4085XLA-O8BGG432I uses Xilinx’s proven CLB-based architecture, where each Configurable Logic Block contains:
- Two independent 4-input Look-Up Tables (LUTs) capable of implementing any 4-input logic function
- Dedicated fast carry logic for high-speed arithmetic operations
- Two flip-flops per CLB for sequential logic
- Wide function multiplexers for combining logic across multiple CLBs
- Internal 3-state buffers for local bus implementations
On-Chip Memory
| Memory Feature |
Details |
| Distributed RAM |
Implemented using LUTs as RAM cells |
| Block RAM |
Dedicated SRAM blocks available within the architecture |
| Shift Registers |
Configurable via LUT-based shift register mode |
I/O Capabilities
The 432-ball BGA package provides a large number of user I/O pins, making this device well-suited for designs requiring extensive bus interfaces or peripheral connectivity.
| I/O Feature |
Specification |
| Total Package Pins |
432 |
| User I/O (approximate) |
256–320 |
| I/O Standards Supported |
LVTTL, LVCMOS, PCI (3.3V) |
| Drive Strength |
Programmable (2mA to 24mA) |
| Slew Rate Control |
Yes (fast/slow selectable) |
| Input Hysteresis |
Optional Schmitt trigger inputs |
| Pull-up / Pull-down |
Programmable per I/O pin |
XC4085XLA-O8BGG432I Package Information
The BG432 (432-Ball BGA) package is a surface-mount ball grid array that offers excellent PCB routing density due to its area-array pin distribution. This package is favored in space-constrained designs where high pin counts must fit within a compact footprint.
| Package Attribute |
Value |
| Package Type |
Ball Grid Array (BGA) |
| Ball Count |
432 |
| Body Size |
23 mm × 23 mm (approximate) |
| Ball Pitch |
1.00 mm |
| Ball Diameter |
0.60 mm (approximate) |
| Mounting |
Surface Mount Technology (SMT) |
| PCB Land Pattern |
Standard BGA footprint |
PCB Design Considerations for the BG432 Package
When designing a PCB for the XC4085XLA-O8BGG432I, engineers should account for:
- Via-in-pad or dogbone fanout strategies to escape inner ball rows
- A minimum of 8 PCB layers recommended for full signal and power/ground plane integrity
- Controlled impedance routing for high-speed I/O and clock signals
- Proper decoupling capacitor placement near VCC and VCCIO balls for noise suppression
- Thermal relief considerations given the BGA’s center thermal pad (if present)
Electrical Characteristics and Power Requirements
Absolute Maximum Ratings
| Parameter |
Value |
| Core Supply Voltage (VCCINT) |
2.5V ±10% |
| I/O Supply Voltage (VCCIO) |
3.3V max |
| Storage Temperature |
-65°C to +150°C |
| Operating Temperature (Industrial) |
-40°C to +85°C |
Typical Power Consumption
Power consumption in FPGAs depends heavily on design utilization and operating frequency. The XC4085XLA-O8BGG432I’s 2.5V core voltage provides a measurable reduction in dynamic power versus earlier 3.3V XC4000E/L devices.
| Condition |
Estimated ICCINT |
| Static (no switching) |
~50–100 mA |
| Typical application (50% utilization, 40 MHz) |
~200–400 mA |
| Maximum (full utilization, max frequency) |
Consult Xilinx datasheet |
Configuration and Programming
Supported Configuration Modes
The XC4085XLA-O8BGG432I supports multiple configuration modes to suit different system architectures:
| Configuration Mode |
Description |
| Master Serial |
FPGA generates CCLK; reads bitstream from serial PROM |
| Slave Serial |
External logic provides CCLK and bitstream data |
| Master Parallel (SelectMAP) |
High-speed byte-wide parallel configuration |
| Slave Parallel (SelectMAP) |
External processor drives parallel config interface |
| Boundary Scan (JTAG) |
IEEE 1149.1-compliant in-system programming and debug |
Configuration Storage Options
Because FPGAs are volatile (they lose configuration on power-off), the bitstream must be stored externally and loaded on every power cycle. Common storage solutions include:
- Xilinx Platform Flash (XCF series) — serial PROM optimized for Xilinx FPGAs
- Parallel NOR Flash — used with SelectMAP mode for faster configuration
- Microcontroller-driven — embedded processor streams bitstream via JTAG or SelectMAP
- EPROM / Parallel PROM — legacy storage option for older system designs
Timing and Clock Resources
Global Clock Networks
The XC4085XLA-O8BGG432I provides dedicated global clock routing that minimizes clock skew across the entire device:
| Clock Feature |
Details |
| Global Clock Inputs |
4 dedicated global clock buffers |
| Clock Skew |
<1 ns across the full device |
| DLL / DCM |
Not available in XC4000XLA (available in Virtex and later) |
| Internal Oscillator |
Not present |
Speed Grade -08 Performance
The -08 speed grade indicates the device’s timing performance tier. In the XC4000XLA numbering convention, smaller numbers indicate faster devices.
| Timing Parameter |
XC4085XLA-08 |
| Maximum System Clock (Fmax) |
~80 MHz (design-dependent) |
| CLB-to-CLB Propagation Delay |
~2–5 ns |
| Setup Time (flip-flop) |
~3 ns |
| Clock-to-Output Delay |
~5–8 ns |
Note: Actual achievable frequency depends on the specific design, routing congestion, and temperature.
Industrial Temperature Range Advantages
The “I” suffix in XC4085XLA-O8BGG432I confirms the industrial temperature rating, which is critical for systems deployed in environments with wide thermal variation. Industrial-grade FPGAs are characterized to operate reliably from -40°C to +85°C, unlike commercial-grade parts limited to 0°C to +70°C.
| Temperature Grade |
Range |
Typical Applications |
| Commercial (C) |
0°C to +70°C |
Office equipment, consumer electronics |
| Industrial (I) |
-40°C to +85°C |
Factory automation, telecom, test equipment |
| Military/Automotive |
-55°C to +125°C |
Defense, aerospace, automotive ECUs |
The XC4085XLA-O8BGG432I’s industrial rating makes it particularly suitable for:
- Industrial control systems and PLCs
- Telecommunications infrastructure equipment
- Medical instrumentation operating in varied environments
- Test and measurement systems requiring long lifecycle operation
XC4085XLA-O8BGG432I vs. Related Parts Comparison
| Part Number |
Logic Gates |
Package |
Speed Grade |
Temp Range |
Core Voltage |
| XC4085XLA-O8BGG432I |
~85K |
BG432 |
-08 |
Industrial |
2.5V |
| XC4085XLA-08BG432C |
~85K |
BG432 |
-08 |
Commercial |
2.5V |
| XC4062XLA-08BG432I |
~62K |
BG432 |
-08 |
Industrial |
2.5V |
| XC4036XLA-08BG432I |
~36K |
BG432 |
-08 |
Industrial |
2.5V |
| XC4085XL-08BG432I |
~85K |
BG432 |
-08 |
Industrial |
3.3V |
The XC4085XLA-O8BGG432I is the industrial temperature counterpart to the XC4085XLA-08BG432C, offering identical logic resources and performance in a wider temperature specification.
Applications for the XC4085XLA-O8BGG432I
The combination of high logic density (~85K gates), a large 432-ball BGA package, industrial temperature rating, and mature XC4000XLA architecture makes this device a strong choice across a wide range of applications:
Digital Signal Processing (DSP)
Finite Impulse Response (FIR) filters, FFT engines, and signal conditioning pipelines leverage the device’s CLB arithmetic resources and fast carry chains.
Communications and Networking
Protocol conversion, line interface logic, SONET/SDH framers, and custom MAC layer implementations benefit from the XC4085XLA’s I/O flexibility and logic density.
Industrial Automation
Motion control, PLC I/O expansion, fieldbus bridges (CANopen, PROFIBUS adapters), and safety logic benefit from the wide industrial temperature range.
Embedded System Co-Processing
Pairing with microcontrollers or microprocessors, the FPGA handles hardware-accelerated tasks including interrupt management, DMA control, and custom peripheral interfaces.
Legacy System Maintenance and Replacement
The XC4085XLA-O8BGG432I is widely used for sustaining engineering — replacing obsolete ASICs, gate arrays, or earlier-generation FPGAs with a re-programmable, sourced solution through distributors like Rochester Electronics.
Why Source the XC4085XLA-O8BGG432I Through Authorized Distributors?
The XC4000XLA family has reached end-of-life status with AMD (formerly Xilinx), making authorized independent distributors like Rochester Electronics a critical supply chain partner. Rochester Electronics specializes in the authorized production and supply of end-of-life semiconductors, including the XC4085XLA series.
Benefits of Authorized Sourcing
| Benefit |
Description |
| Guaranteed Authenticity |
Parts sourced directly from original manufacturer or licensed production |
| Traceability |
Full supply chain documentation from wafer to finished device |
| Longevity |
Multi-year supply commitments for maintenance programs |
| Quality Assurance |
IEC/ISO-certified testing and inspection processes |
| Technical Support |
Application engineering support for design-in and obsolescence migration |
Frequently Asked Questions (FAQ)
Q: What is the difference between XC4085XLA-O8BGG432I and XC4085XLA-08BG432C? A: The only difference is the temperature rating. The “I” suffix indicates industrial grade (-40°C to +85°C), while the “C” suffix indicates commercial grade (0°C to +70°C). All logic, package, and speed specifications are identical.
Q: Is the XC4085XLA-O8BGG432I still in production? A: The XC4000XLA family has been discontinued by AMD/Xilinx. However, authorized distributors such as Rochester Electronics continue to supply these parts from existing inventory or through licensed re-manufacturing.
Q: Can I use Xilinx ISE to design for the XC4085XLA-O8BGG432I? A: Yes. Xilinx ISE Design Suite (Legacy) supports the full XC4000XLA family. Note that Vivado does not support this older device family. ISE 14.7 is the final version and remains available for download from AMD’s support archives.
Q: What configuration PROM is compatible with the XC4085XLA-O8BGG432I? A: Xilinx XCF Platform Flash PROMs (e.g., XCF08P or XCF16P) are commonly used. Alternatively, any standard serial PROM with SPI or byte-wide parallel interface compatible with the SelectMAP mode can be used.
Q: What is the bitstream size for the XC4085XLA? A: Approximately 2–4 MB depending on configuration mode and compression. Consult the Xilinx XC4000XLA/XV datasheet for exact frame counts and bitstream length.
Summary
The XC4085XLA-O8BGG432I is a proven, high-density FPGA offering approximately 85,000 logic gate equivalents in a 432-ball BGA package, rated for industrial temperatures from -40°C to +85°C. Its 2.5V core voltage (XLA series), -08 speed grade targeting up to ~80 MHz system clock, and mature CLB-based architecture make it an enduring choice for industrial, communications, and embedded applications — as well as a go-to solution for ASIC and legacy FPGA replacement programs.
For long-term procurement, verify current stock availability through authorized distributors to ensure full traceability and counterfeit protection.
