The XC4085XLA-09HQ240I is a high-density, low-power Field Programmable Gate Array (FPGA) from the Xilinx XC4000XLA family. Designed for demanding industrial and embedded applications, this device combines a large logic capacity with advanced I/O flexibility inside a compact 240-pin HQFP package. Whether you are prototyping complex digital systems or deploying production-ready embedded logic, the XC4085XLA-09HQ240I delivers the performance and reliability modern designs require.
For engineers looking for a wide selection of Xilinx FPGA devices, this part represents one of the most capable options in the XC4000XLA product line.
What Is the XC4085XLA-09HQ240I?
The XC4085XLA-09HQ240I is a member of Xilinx’s XC4000XLA FPGA family — an enhanced variant of the classic XC4000 series featuring lower core voltage (3.3 V), improved speed grades, and better noise immunity. The “85” in the part number refers to the approximate gate count (85,000 gates), making it one of the largest devices in the XC4000XLA lineup. The “-09” speed grade indicates a 9 ns propagation delay, and the “HQ240I” suffix specifies the 240-pin HQFP (Heat-slug Quad Flat Pack) package rated for industrial temperature operation.
XC4085XLA-09HQ240I Key Specifications
The table below summarizes the most important electrical and physical parameters of the XC4085XLA-09HQ240I.
| Parameter |
Value |
| Manufacturer |
Xilinx (AMD) |
| Part Number |
XC4085XLA-09HQ240I |
| FPGA Family |
XC4000XLA |
| Logic Cells / Gates |
~85,000 gates (approximately 3,328 CLBs) |
| Configurable Logic Blocks (CLBs) |
3,328 |
| Maximum User I/O Pins |
166 |
| Package Type |
240-Pin HQFP (Heat-slug Quad Flat Pack) |
| Package Body Size |
36 mm × 36 mm |
| Speed Grade |
-09 (9 ns worst-case delay) |
| Supply Voltage (VCC Core) |
3.3 V |
| I/O Voltage |
3.3 V (5 V tolerant) |
| Operating Temperature |
–40°C to +100°C (Industrial “I” grade) |
| On-Chip RAM (Total Bits) |
~32,768 bits (distributed RAM) |
| Configuration Interface |
Serial / Parallel (Master/Slave) |
| RoHS Status |
Non-RoHS (legacy device) |
XC4085XLA-09HQ240I Pin Configuration and Package Details
Understanding the physical package is critical for PCB layout and thermal management. The HQ240I package is a plastic HQFP with a heat slug exposed on the bottom, improving thermal dissipation in dense board environments.
HQ240 Package Dimensions
| Dimension |
Value |
| Package Type |
Plastic HQFP |
| Total Pin Count |
240 |
| Pitch (Lead-to-Lead) |
0.5 mm |
| Body Size (L × W) |
36 mm × 36 mm |
| Thickness |
~3.8 mm |
| Mounting Style |
Surface Mount (SMD) |
| Heat Slug |
Yes (bottom-side exposed pad) |
Temperature Grade Breakdown
| Suffix |
Grade |
Temperature Range |
| C |
Commercial |
0°C to +85°C |
| I |
Industrial |
–40°C to +100°C |
| M |
Military |
–55°C to +125°C |
The “I” suffix on XC4085XLA-09HQ240I confirms industrial-grade reliability — essential for automotive, defense, and harsh-environment applications.
XC4085XLA-09HQ240I Speed Grade and Timing Performance
The “-09” speed grade defines the device’s maximum performance envelope. FPGA speed grades represent the worst-case path delay under worst-case voltage and temperature conditions.
Speed Grade Comparison – XC4085XLA Family
| Speed Grade |
Worst-Case Propagation Delay |
Max System Frequency (typical) |
| -07 |
7 ns |
~120 MHz |
| -09 |
9 ns |
~100 MHz |
| -11 |
11 ns |
~80 MHz |
The -09 speed grade provides a balance between power consumption and performance, making it suitable for most embedded control, DSP, and communication applications running below 100 MHz.
XC4085XLA Architecture Overview
Configurable Logic Blocks (CLBs)
Each CLB in the XC4000XLA family contains two 4-input Look-Up Tables (LUTs), two flip-flops, and dedicated carry logic. The XC4085XLA provides 3,328 CLBs arranged in a regular array, enabling complex combinational and sequential logic functions.
On-Chip RAM
Distributed RAM is implemented using CLB LUTs, providing on-chip storage without consuming dedicated block RAM resources. The XC4085XLA supports up to 32,768 bits of distributed RAM — enough for small FIFOs, lookup tables, and register files.
I/O Blocks (IOBs)
The 240-pin package exposes 166 user I/O pins, each with programmable input/output standards. IOBs support registered inputs and outputs, and each I/O pin can be independently configured as input, output, or bidirectional.
Clock Distribution
The XC4000XLA family features four global clock buffers, ensuring low-skew clock distribution across all CLBs and IOBs — critical for high-speed synchronous designs.
XC4085XLA-09HQ240I Electrical Characteristics
Absolute Maximum Ratings
| Parameter |
Value |
| Supply Voltage (VCC) |
–0.5 V to +4.0 V |
| Input Voltage |
–0.5 V to VCC + 0.5 V |
| Storage Temperature |
–65°C to +150°C |
| Maximum Junction Temperature |
+125°C |
Recommended Operating Conditions
| Parameter |
Min |
Typical |
Max |
Unit |
| Core Supply Voltage (VCC) |
3.0 |
3.3 |
3.6 |
V |
| I/O Supply Voltage (VCCO) |
3.0 |
3.3 |
3.6 |
V |
| Input High Voltage (VIH) |
2.0 |
— |
VCC + 0.5 |
V |
| Input Low Voltage (VIL) |
–0.5 |
— |
0.8 |
V |
| Operating Temperature (Industrial) |
–40 |
25 |
+100 |
°C |
Configuration Modes for the XC4085XLA-09HQ240I
The XC4085XLA-09HQ240I supports multiple configuration modes, giving designers flexibility in how the FPGA loads its programming bitstream at power-up.
| Configuration Mode |
Interface |
Description |
| Master Serial |
SPI-like (1-bit) |
Reads bitstream from external serial PROM |
| Slave Serial |
SPI-like (1-bit) |
Receives bitstream from external host |
| Master Parallel (Up) |
8-bit parallel |
Reads from parallel PROM (address increments upward) |
| Master Parallel (Down) |
8-bit parallel |
Reads from parallel PROM (address decrements) |
| Slave Parallel (SelectMAP) |
8-bit parallel |
Receives bitstream from processor or controller |
| Boundary Scan (JTAG) |
IEEE 1149.1 |
Configures via JTAG interface |
JTAG-based configuration is the preferred method for in-system programming (ISP) and debugging.
Applications for XC4085XLA-09HQ240I
The XC4085XLA-09HQ240I is suitable for a broad range of industrial and embedded applications:
- Industrial Control Systems – Motor drive controllers, programmable logic controllers (PLCs), and safety-critical logic
- Communications Equipment – Protocol bridges, UART/SPI/I2C controllers, and line interfaces
- Test & Measurement – Signal acquisition front ends, logic analyzers, and pattern generators
- Medical Devices – Low-power portable instruments requiring programmable logic
- Military & Defense – The industrial temperature grade supports ruggedized environments
- Embedded Processing – Implementing softcore processors (MicroBlaze-compatible softcores were not available on XC4000 generation, but custom state machines and co-processors are possible)
- Legacy FPGA Replacement – Direct pin-compatible replacement for XC4028XLA-09HQ240I with more logic capacity
XC4085XLA-09HQ240I vs. Related Xilinx FPGA Parts
Designers choosing between XC4000XLA devices should consider logic density, I/O count, and package availability.
| Part Number |
Logic Gates |
CLBs |
Max User I/O |
Package |
Speed Grade |
| XC4013XLA-09HQ240I |
~13,000 |
576 |
166 |
HQ240 |
-09 |
| XC4020XLA-09HQ240I |
~20,000 |
900 |
166 |
HQ240 |
-09 |
| XC4028XLA-09HQ240I |
~28,000 |
1,024 |
166 |
HQ240 |
-09 |
| XC4085XLA-09HQ240I |
~85,000 |
3,328 |
166 |
HQ240 |
-09 |
| XC4085XLA-07HQ240I |
~85,000 |
3,328 |
166 |
HQ240 |
-07 |
The XC4085XLA-09HQ240I offers the highest logic density in the HQ240 package footprint, making it the best choice when maximum gate count is required without changing the PCB layout.
Ordering Information
| Attribute |
Detail |
| Full Part Number |
XC4085XLA-09HQ240I |
| Manufacturer |
Xilinx / AMD |
| Series |
XC4000XLA |
| Package |
240-Pin HQFP |
| Temperature Grade |
Industrial (–40°C to +100°C) |
| Speed Grade |
-09 |
| Mounting |
Surface Mount |
| Lead Finish |
SnPb (Tin-Lead) – Legacy device |
| ECCN (Export) |
3A991 (check current regulations) |
Design Resources and Support
Programming Tools
The XC4085XLA-09HQ240I is supported by Xilinx ISE Design Suite (legacy tool). Designers working on new projects should be aware that ISE is no longer actively developed; however, it remains the correct toolchain for all XC4000-series devices. The design flow includes:
- RTL design entry (VHDL or Verilog)
- Synthesis using XST (Xilinx Synthesis Technology)
- Implementation (Translate, Map, Place & Route)
- Bitstream generation (
.bit file)
- Device programming via iMPACT or JTAG cable
Reference Documentation
- DS058 – XC4000XLA/XV Data Sheet (available from Xilinx/AMD)
- XAPP131 – Configuration and Readback of XC4000 Series FPGAs
- UG625 – Constraints Guide (ISE)
Frequently Asked Questions (FAQ)
Q: Is the XC4085XLA-09HQ240I still in production? A: The XC4000XLA family is a mature/legacy product line. Availability depends on distributor stock. Check authorized distributors for current inventory.
Q: Can the XC4085XLA-09HQ240I operate at 5 V I/O? A: The core operates at 3.3 V. The IOBs are 5 V tolerant on inputs but output at 3.3 V levels. External level-shifting may be required for true 5 V I/O interfacing.
Q: What is the difference between XC4085XLA and XC4085XL? A: The XLA variant features enhanced performance and lower power compared to the standard XL series, while maintaining pin compatibility.
Q: Which programmer is compatible with the XC4085XLA-09HQ240I? A: Xilinx Platform Cable USB II (DLC10) or Xilinx Parallel Cable IV (PC4) can be used with the ISE iMPACT programming software via JTAG.
Q: Can I replace an XC4028XLA-09HQ240I with the XC4085XLA-09HQ240I? A: Yes. Both share the same HQ240 package and pin-out family. The XC4085XLA offers more logic capacity and is pin-compatible, making it a direct upgrade path.
Summary
The XC4085XLA-09HQ240I is a proven, high-density FPGA delivering 85,000 gates of programmable logic in a 240-pin HQFP surface-mount package. With its industrial temperature rating (–40°C to +100°C), 3.3 V operation, 166 user I/O pins, and -09 speed grade, it is an excellent choice for embedded control, communications, test equipment, and legacy system design. Engineers who require even more information about compatible and next-generation devices can explore the full range available on our Xilinx FPGA product page.
