XC7VX485T-2FFG1761I vs XC7VX690T-2FFG1761I: Virtex-7 FPGA Comparison

ElecSuppliers Part Number ComparisonAug 17, 2026

The XC7VX485T-2FFG1761I and XC7VX690T-2FFG1761I are high-capacity AMD Xilinx Virtex-7 FPGAs designed for demanding programmable-logic applications.

Both devices use the -2 speed grade, FFG1761 package, and industrial temperature grade. They also belong to the same Virtex-7 FPGA family.

The primary difference is the amount of programmable logic and other internal resources. The XC7VX690T is the larger device, making it suitable for designs that require more FPGA capacity than the XC7VX485T can provide.

XC7VX485T-2FFG1761I

The XC7VX485T-2FFG1761I is a high-density Virtex-7 FPGA with approximately 485K logic cells.

It is designed for applications where large programmable logic capacity, high-speed processing, DSP resources, memory, and serial connectivity are required.

Typical applications include communications infrastructure, video processing, scientific instrumentation, aerospace and defense systems, networking, and high-speed data processing.

The FFG1761 package provides a large number of connections for complex FPGA systems.

XC7VX690T-2FFG1761I

The XC7VX690T-2FFG1761I provides a substantially larger FPGA fabric.

With approximately 693K logic cells, it offers considerably more capacity than the XC7VX485T.

This additional capacity is useful when a design includes multiple processing pipelines, large hardware accelerators, extensive buffering, or complex communication logic.

For an existing XC7VX485T design that is approaching its resource limits, XC7VX690T is a device worth evaluating as a higher-capacity option.

XC7VX485T vs XC7VX690T

The XC7VX690T provides roughly 43% more logic-cell capacity than the XC7VX485T.

That is a substantial difference for large FPGA designs.

Why the XC7VX690T Has More Design Headroom

The extra capacity of XC7VX690T can be useful when FPGA logic is divided into multiple parallel functions.

A large system might contain:

High-speed data interfaces

DSP pipelines

Packet-processing logic

Video processing

Memory controllers

Custom accelerators

Real-time control logic

As these functions increase, FPGA utilization can rise quickly.

A larger device provides additional room for integrating these functions into one FPGA.

Logic Cells Are Not the Only Consideration

Although logic-cell capacity is an important specification, it should not be used as the only basis for a replacement decision.

Engineers should also check the actual utilization of:

Block RAM

DSP resources

I/O

Clocking resources

High-speed serial transceivers

Configuration resources

A design may fit within the XC7VX485T's logic capacity but still fail because another resource is exhausted.

This is why the Vivado implementation report is essential when evaluating a migration.

Same FFG1761 Package

Both devices use the FFG1761 package.

This makes them an interesting pair for engineers investigating an upgrade without changing the general package class.

However, the same package designation does not automatically guarantee pin-for-pin compatibility.

Before moving from XC7VX485T to XC7VX690T, the complete pinout should be checked.

Power pins, I/O banks, clock pins, configuration connections, and high-speed transceiver assignments must all be reviewed.

XC7VX690T as an XC7VX485T Upgrade

The XC7VX690T-2FFG1761I is a logical upgrade candidate when an XC7VX485T design requires more FPGA resources.

The additional logic capacity can support larger processing architectures and future product expansion.

A migration can be particularly attractive when the existing system already uses the FFG1761 package and the same speed-grade class.

Nevertheless, the FPGA project should be rebuilt against the target device and fully tested.

Can XC7VX485T Replace XC7VX690T?

The smaller XC7VX485T can only replace an XC7VX690T when the existing design has sufficient resource margin.

A design that uses most of the XC7VX690T's available logic cannot simply be moved to the smaller device.

Engineers should first review the implementation report and determine whether LUT, register, BRAM, DSP, I/O, and transceiver requirements remain within XC7VX485T limits.

If not, the design would need to be reduced or redesigned.

XC7VX690T Replacement Selection

When looking for an XC7VX690T replacement, the complete part number should be considered.

A replacement should be evaluated for:

Virtex-7 architecture

Logic capacity

DSP resources

Block RAM

I/O

Transceivers

Speed grade

FFG1761 package

Industrial temperature rating

Power requirements

Timing performance

PCB compatibility

A newer FPGA family may provide greater performance, but it will not necessarily be a direct hardware replacement.

For legacy systems, package and pin compatibility can therefore be just as important as raw FPGA capacity.

XC7VX485T vs XC7VX690T for Legacy Designs

Both devices can be relevant when maintaining existing Virtex-7 systems.

For a mature design that already uses XC7VX485T, moving to XC7VX690T can provide additional capacity for feature expansion.

For an existing XC7VX690T product, locating an equivalent replacement can be more challenging because the larger device has a different resource profile.

In such cases, engineers should first determine whether the requirement is for a true pin-compatible replacement, a functional equivalent, or simply a larger-capacity alternative.

Which Virtex-7 FPGA Should You Choose?

The XC7VX485T-2FFG1761I is suitable when its available FPGA resources meet the requirements of the design.

The XC7VX690T-2FFG1761I is more appropriate when additional logic capacity is required.

The two devices share the same Virtex-7 family, -2 speed grade, FFG1761 package designation, and industrial temperature grade, making them useful candidates for a capacity-focused comparison.

For migration projects, however, package similarity should not be treated as proof of drop-in compatibility. Pinout, power, I/O banks, transceivers, timing, and actual FPGA utilization should all be verified before selecting the replacement device.