XC7VX690T-2FFG1157I vs XC7VX690T-1FFG1157I: Key Differences

ElecSuppliers Part Number ComparisonAug 17, 2026

The XC7VX690T-2FFG1157I and XC7VX690T-1FFG1157I are two versions of the AMD Xilinx Virtex-7 XC7VX690T FPGA. Both use the FFG1157 package and offer the same large FPGA architecture, making them easy to confuse when selecting a replacement.

The main difference is the speed grade. The XC7VX690T-2FFG1157I uses the -2 speed grade, while the XC7VX690T-1FFG1157I uses the -1 speed grade. This difference affects the timing performance of the FPGA rather than its basic logic capacity.

What Is XC7VX690T-2FFG1157I?

XC7VX690T-2FFG1157I is a high-density Virtex-7 FPGA designed for applications that require substantial programmable logic, memory, DSP resources, and high-speed interfaces.

The device provides 693,120 logic cells and 600 user I/Os. The FFG1157 designation identifies its 1157-ball FCBGA package. The final I indicates the industrial temperature grade.

The -2 speed grade provides higher timing performance than the -1 version, making this device suitable for designs with demanding clock and interface requirements.

What Is XC7VX690T-1FFG1157I?

XC7VX690T-1FFG1157I belongs to the same Virtex-7 XC7VX690T family. It also uses the FFG1157 package and provides the same major FPGA resources.

The important difference is the -1 speed grade.

For many designs, the -1 version can provide sufficient performance. However, if the original design depends on the timing margin of the -2 device, changing to -1 may require additional timing analysis and design optimization.

XC7VX690T-2 vs XC7VX690T-1

The -2 and -1 numbers in these part numbers represent different FPGA speed grades.

XC7VX690T-2FFG1157I uses Speed Grade -2.

XC7VX690T-1FFG1157I uses Speed Grade -1.

The -2 grade offers better timing performance than the -1 grade. This can be important when an FPGA design contains high-frequency clocks, long logic paths, high-speed data processing, or demanding I/O interfaces.

The difference does not mean that the -2 device has more logic cells or more I/O pins. Both devices are based on the same XC7VX690T FPGA architecture.

XC7VX690T-2FFG1157I vs XC7VX690T-1FFG1157I Specifications

The table shows why these two devices are often considered as alternatives. Most of the fundamental device specifications are the same, while the speed grade is the primary difference.

Does XC7VX690T-2 Have Better Performance?

Yes. The -2 speed grade provides higher timing performance than the -1 speed grade.

This matters when determining whether an FPGA design can achieve its required clock frequency.

For example, if an existing design has very little timing margin on the -2 device, moving to the -1 version could result in setup or other timing violations. If the design has significant timing margin, the -1 version may still meet the system requirements.

The actual result depends on the design and should be verified using the FPGA implementation and timing-analysis tools.

Are the Two FFG1157 Devices Pin Compatible?

Because both part numbers use the FFG1157 package, they are strong candidates for evaluating board-level replacement.

However, having the same package does not mean that an engineer should replace one device without verification.

Before changing the FPGA, check the PCB footprint, power connections, I/O assignments, clock resources, configuration interface, and high-speed transceiver connections.

The existing design should also be rebuilt with the target FPGA device to verify timing and implementation results.

Can XC7VX690T-1FFG1157I Replace XC7VX690T-2FFG1157I?

In some applications, yes.

The XC7VX690T-1FFG1157I can be considered when the original XC7VX690T-2FFG1157I is unavailable and the design does not require the higher timing performance of the -2 speed grade.

The key requirement is timing verification.

If the design continues to meet all required clock and interface timing specifications with the -1 device, the lower speed grade may be suitable.

For high-performance designs with limited timing margin, however, the -1 version may not be an appropriate replacement.

Can XC7VX690T-2FFG1157I Replace XC7VX690T-1FFG1157I?

The -2 version can also be considered as an alternative to the -1 version.

Since the -2 speed grade provides higher timing performance, it can offer additional timing margin in a design originally developed around the -1 grade.

Even so, engineers should verify the complete device configuration, PCB compatibility, power requirements, and production qualification before making a substitution.

XC7VX690T-2FFG1157I vs XC7VX690T-1FFG1157I for New Designs

For a new FPGA design, the choice should be based on the required performance rather than simply selecting the faster device.

The -2 version is more suitable when the design requires higher clock performance or additional timing margin.

The -1 version can be sufficient for applications where the required performance is lower and cost or availability is more important.

The FPGA implementation should be evaluated before finalizing the speed grade.

Which XC7VX690T FPGA Should You Choose?

Choose XC7VX690T-2FFG1157I when the application has demanding timing requirements or when additional timing margin is important.

Choose XC7VX690T-1FFG1157I when the design can meet its timing requirements with the -1 speed grade and the lower performance grade is acceptable.

For an existing board, the fact that both devices use the FFG1157 package makes them worth evaluating as potential alternatives. The final decision should be based on timing analysis rather than package compatibility alone.

XC7VX690T-2FFG1157I vs XC7VX690T-1FFG1157I: Final Comparison

The XC7VX690T-2FFG1157I and XC7VX690T-1FFG1157I are closely related Virtex-7 FPGA devices with the same XC7VX690T architecture and FFG1157 package.

The main difference is the speed grade. XC7VX690T-2FFG1157I offers higher timing performance, while XC7VX690T-1FFG1157I uses the lower -1 speed grade.

For engineers searching for an XC7VX690T replacement, either device may be worth evaluating depending on the original design requirements. However, timing closure, package compatibility, power requirements, and system qualification should all be checked before a production replacement is made.