XC3S400-5FG456C
XC3S400-5FG456C - 400K Gate Spartan-3 FPGA | AMD
The AMD XC3S400-5FG456C is a Spartan-3 field-programmable gate array containing 400,000 system gates and 8,064 configurable logic cells in a 456-ball fine-pitch ball grid array package. The device operates from a 1.2 V core supply, uses 90 nm fabrication technology, and supports performance ratings up to 725 MHz. It provides 264 I/O sites, making it suitable for designs that combine substantial parallel logic, embedded memory, and external interfaces on one programmable device.
A field-programmable gate array, or FPGA, is a semiconductor whose digital functions are defined by a user-loaded bitstream rather than a fixed mask used for an application-specific integrated circuit. Within the product hierarchy, the XC3S400-5FG456C is an FPGA, a programmable-logic semiconductor, and a member of the AMD Spartan-3 family. This positioning makes it useful for prototypes, embedded control systems, industrial equipment, communications interfaces, and other designs that benefit from hardware flexibility, short development cycles, and field reconfiguration.
Principal features include 400,000 system gates, 8,064 logic cells, 264 I/O sites, a 456-ball FBGA package, and a 725 MHz performance rating. The 1.2 V operating supply corresponds to the device's low-voltage internal core. Spartan-3 devices support configurable logic, block RAM, dedicated multipliers, digital clock management, and programmable I/O resources. Designers use these resources for parallel datapaths, control state machines, data acquisition, packet processing, and interface bridging.
The XC3S400-5FG456C combines a 456-ball package with approximately 264 user I/O sites. This high pin count supports memory-intensive and interface-heavy systems, but it also requires careful escape routing, multilayer PCB construction, and controlled-impedance signal integrity. The -5 speed suffix identifies the device's performance grade, while the commercial-temperature designation supports general industrial and commercial implementations when the complete system thermal environment remains within the specified limits.
Typical applications include industrial automation controllers, data-acquisition and signal-processing systems, communications infrastructure, embedded video or imaging control, test equipment, and custom accelerator logic. In these systems, the FPGA can execute parallel algorithms, manage multiple external buses, and adapt its behavior through configuration updates without changing the printed circuit board.
A key design consideration is that software migration is not automatically compatible across speed grades, package markings, or Spartan-3 device families. A replacement should be checked against the package ball map, voltage requirements, I/O standards, configuration interface, and timing constraints. The manufacturer DS099 Spartan-3 family datasheet should be used to validate the selected device, pinout, electrical limits, and configuration requirements.
This product page combines the manufacturer family documentation with package, resource, interface, and replacement information intended to accelerate engineering evaluation. It also distinguishes speed-grade alternatives from industrial or package-marked variants, helping designers identify a candidate that matches the original PCB while recognizing any temperature, timing, or qualification differences that must still be reviewed before production release.
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