The XC4085XLA-08BG432C is a high-capacity Field Programmable Gate Array (FPGA) from Xilinx’s XC4000XLA family. Built on a 0.35 µm CMOS process and housed in a compact 432-pin BGA package, this device delivers 85,000 gates of programmable logic with a 3.3V supply — making it a reliable choice for legacy system maintenance, industrial control, and complex digital design applications.
If you are sourcing, evaluating, or designing with the XC4085XLA-08BG432C, this guide covers everything you need: full specifications, pin configuration, I/O details, configuration modes, and application notes.
What Is the XC4085XLA-08BG432C?
The XC4085XLA-08BG432C is part of Xilinx’s XC4000XLA/XV Field Programmable Gate Array series — a product line that represents the result of over fifteen years of FPGA design experience and customer feedback. This family combines architectural versatility, high-speed performance, abundant routing resources, and sophisticated design software to enable fully automated implementation of complex, high-density digital designs.
The part number breaks down as follows:
| Part Number Segment |
Meaning |
| XC4085 |
XC4000 family, 85,000 gate equivalent |
| XLA |
XLA sub-family (low voltage, enhanced) |
| -08 |
Speed grade (8 ns, operating up to 263 MHz) |
| BG432 |
Ball Grid Array, 432 pins |
| C |
Commercial temperature range (0°C to +85°C) |
Looking for broader context on this product family? Visit our Xilinx FPGA resource page for additional guidance.
XC4085XLA-08BG432C Key Specifications
General Parameters
| Parameter |
Value |
| Manufacturer |
Xilinx (now AMD) |
| Part Number |
XC4085XLA-08BG432C |
| Product Family |
XC4000XLA/XV |
| Technology |
0.35 µm CMOS |
| Supply Voltage |
3.3V |
| Logic Gates |
85,000 |
| Configurable Logic Blocks (CLBs) |
3,136 (with ~7,448 cells) |
| Speed Grade |
-08 |
| Maximum Frequency |
263 MHz |
| Package Type |
432-Pin BGA (Ball Grid Array) |
| Operating Temperature |
0°C to +85°C (Commercial) |
| RoHS Compliance |
Not Compliant (legacy product) |
| Distributor (Authorized) |
Rochester Electronics LLC |
XC4085XLA-08BG432C Logic Architecture
Configurable Logic Blocks (CLBs)
The XC4085XLA-08BG432C provides approximately 85,000 system gate equivalents implemented through 3,136 Configurable Logic Blocks (CLBs). Each CLB contains two independent logic function units capable of processing up to four input signals each (labeled F1–F4 and G1–G4). These units can be programmed to implement virtually any combinational or sequential logic function.
Signal routing within the block is managed by internal multiplexers, and each CLB includes integrated flip-flops with configurable set/reset controls for predictable sequential logic behavior.
Clock Resources
| Feature |
Detail |
| Global Clock Networks |
8 low-skew networks |
| Clock Distribution |
Low-skew, matched routing |
| Timing Closure |
Supports complex multi-clock designs |
Eight global low-skew clock networks ensure precise timing synchronization across all logic blocks — critical for high-speed, multi-domain designs.
I/O Specifications and Standards
Supported I/O Standards
The XC4085XLA-08BG432C supports multiple I/O voltage standards, enabling seamless integration with both legacy and modern systems:
| I/O Standard |
Supported |
| 5V TTL |
Yes |
| 3.3V LVTTL |
Yes |
| PCI-Compatible |
Yes |
| Programmable Slew Rate |
Yes |
| Programmable Drive Strength |
Yes |
Output Drive Strength Options
| Drive Setting |
Current |
| Standard |
12 mA |
| High Drive |
24 mA |
The programmable drive strength makes this device adaptable for applications with varying load conditions, from low-power embedded interfaces to high-speed bus connections.
Package Information: 432-Pin BGA
The BG432 package designation indicates a Ball Grid Array with 432 solder balls, offering a high pin-count in a relatively compact footprint. This package is well-suited for board designs that require dense I/O connectivity.
| Package Attribute |
Detail |
| Package Type |
BGA (Ball Grid Array) |
| Total Pins |
432 |
| User I/O Pins |
Up to 284 (varies by configuration) |
| Mounting Style |
Surface Mount (SMD) |
| Compatible Alternate Parts |
XC4085XLA-09BG432C, XC4085XLA-07BG432C |
Configuration Modes
The XC4085XLA-08BG432C supports multiple configuration methods, providing flexibility for different system architectures:
Supported Configuration Modes
| Mode |
Description |
| Master Serial |
FPGA reads configuration from an external PROM |
| Slave Serial |
FPGA receives config data from a master device |
| Master/Slave Parallel |
Faster loading via parallel data bus |
| Peripheral (Byte-wide) |
Microprocessor-controlled configuration |
| Boundary Scan (JTAG) |
IEEE 1149.1 compliant in-system testing |
Master/Slave Serial Configuration Detail
In Master/Slave Serial mode, the XC4085XLA-08BG432C typically acts as a slave in a daisy-chain configuration. A master FPGA (such as another XC4000-series device) reads configuration data from an external PROM (e.g., XC1700D) and forwards it via DOUT to the DIN of the XC4085XLA. Control signals — PROGRAM, INIT, and DONE — manage the configuration sequence, allowing multiple FPGAs to be configured from a single data stream.
JTAG Boundary Scan
The device supports IEEE 1149.1 JTAG boundary scan, enabling:
- In-system configuration and testing
- Board-level fault isolation and diagnostics
- Unlimited reprogramming without physical removal
- Readback of internal configuration state for debugging
On-Chip RAM and Memory Features
The XC4085XLA-08BG432C includes on-chip distributed RAM within its CLB structure, making it suitable for buffering, FIFOs, and embedded memory structures in programmable logic.
| Memory Feature |
Detail |
| Distributed RAM |
Available within CLBs |
| Typical Use |
FIFOs, shift registers, LUTs |
| Configuration |
Synchronous or Asynchronous |
Ordering Information and Part Number Variants
The XC4085XLA family is available in multiple speed grades and package types. The table below shows common variants related to the XC4085XLA-08BG432C:
| Part Number |
Speed Grade |
Max Freq |
Package |
Temperature |
| XC4085XLA-07BG432C |
-07 (fastest) |
294 MHz |
BGA-432 |
Commercial |
| XC4085XLA-08BG432C |
-08 |
263 MHz |
BGA-432 |
Commercial |
| XC4085XLA-09BG432C |
-09 (slowest) |
227 MHz |
BGA-432 |
Commercial |
| XC4085XLA-08HQ304I |
-08 |
263 MHz |
HQFP-304 |
Industrial |
| XC4085XLA-09BG560C |
-09 |
227 MHz |
BGA-560 |
Commercial |
Applications for the XC4085XLA-08BG432C
The XC4085XLA-08BG432C has seen deployment across a wide range of industries. Its large gate count, BGA packaging, and broad I/O standard support make it well-suited for:
Industrial and Embedded Applications
- Industrial control systems — programmable logic for machine control and automation
- Electronic point of sale (EPOS) — logic processing in retail terminal hardware
- Legacy system maintenance — replacement and lifecycle support for aging designs
Communications and Data
- Data communication modules — protocol bridging and logic interface design
- Enterprise networking equipment — packet processing and data path logic
- Datacom switching hardware — high-speed routing logic support
Automotive and Consumer
- Automotive body electronics — control and signal processing applications
- Infotainment systems — display logic and data handling
- Personal electronics — embedded logic in consumer devices
- Gaming hardware — logic processing in embedded gaming systems
Design Tools Compatibility
The XC4085XLA-08BG432C is supported by Xilinx legacy design tools. Engineers working with this part should reference:
| Tool |
Notes |
| Xilinx ISE Design Suite |
Primary legacy tool for XC4000 family |
| Foundation Series |
Earlier Xilinx toolchain, supported |
| JEDEC Bitstream Format |
Standard configuration bitstream |
| XC1700D PROM |
Compatible serial configuration PROM |
Why Choose the XC4085XLA-08BG432C?
The XC4085XLA-08BG432C remains in demand for several key reasons:
- High gate count — 85,000 equivalent gates provide substantial logic capacity for complex designs
- Proven architecture — the XC4000XLA family has a long track record in mission-critical applications
- Flexible I/O — multi-standard support from 5V TTL to PCI-compatible signaling
- Compact BGA footprint — 432-pin BGA supports dense PCB designs with high I/O density
- Mid-range speed grade — the -08 grade offers a balanced performance point within the XLA family
- Legacy system compatibility — pin-compatible with -07 and -09 speed grade variants
Frequently Asked Questions
Q: Is the XC4085XLA-08BG432C still in production? The XC4085XLA-08BG432C is classified as a legacy/end-of-life Xilinx product. Rochester Electronics LLC provides authorized, long-term supply for ongoing production and maintenance needs.
Q: What is the difference between XC4085XLA-08BG432C and XC4085XLA-09BG432C? The only difference is the speed grade. The -08 variant operates at up to 263 MHz, while the -09 operates at up to 227 MHz. Both use the same BGA-432 package and are pin-compatible.
Q: Can the XC4085XLA-08BG432C be reprogrammed in-system? Yes. The device supports unlimited reprogramming via JTAG (IEEE 1149.1) and serial/parallel configuration modes without physical removal from the PCB.
Q: What are the recommended configuration PROMs for this device? The XC1700D series of serial PROMs is commonly used with the XC4085XLA family in Master Serial configuration mode.
Summary
The XC4085XLA-08BG432C is a field-proven, high-gate-count FPGA from Xilinx’s XC4000XLA family. With 85,000 gates, 3,136 CLBs, 263 MHz maximum operating frequency, 8 global clock networks, multi-standard I/O support, and a 432-pin BGA package, it remains a trusted component in industrial, communications, and legacy system designs. Distributed by Rochester Electronics LLC, this part is available for long-term production support and end-of-life replacement applications.
