XC3S400-4FTG256C - 400K Gate Spartan-3 FPGA | AMD | 256-LBGA
MPN： XC3S400-4FTG256C ✗ 停產XC3S400-4FTG256C 概覽
A field-programmable gate array is a digital semiconductor whose logic functions are established after fabrication by loading a configuration bitstream. FPGAs sit within the broader programmable-logic hierarchy, alongside CPLDs, and are used when parallel hardware processing, high logic density, configurable interfaces, or design revision flexibility are more important than the simplicity of a fixed-function ASIC. The Spartan-3 architecture is intended for embedded systems requiring moderate logic capacity without the cost and complexity of the largest FPGA families.
The XC3S400-4FTG256C provides 8,064 logic cells and 294,912 system gates according to the manufacturer-related product listing. Its 256-LBGA package supports dense board integration, while the 1.2 V supply specification identifies it as a 1.2 V FPGA. The exact device speed grade is encoded by the -4 designation, and the FTG256 package, commercial temperature option, and RoHS-oriented lead-free construction are reflected in the ordering code.
Typical uses include industrial control, communications infrastructure, instrumentation, video processing, embedded systems, and digital signal-processing front ends. The programmable architecture allows parallel datapaths, custom interface logic, protocol handling, and control functions to be consolidated into one device. Designers should verify pin-level power, configuration, clock, and differential-I/O requirements against the Spartan-3 family documentation before laying out the PCB.
The most important design tradeoff is package migration. A part with the same logic-cell count but a different package cannot be assumed to be a drop-in replacement. When replacing the XC3S400-4FTG256C, confirm the exact FTG256 footprint, ball assignment, speed grade, temperature range, supply architecture, configuration interface, and high-speed I/O requirements. For new designs, the I/O count and selected package should be checked against the intended board outline and escape-routing strategy.
This page combines the key ordering information for the XC3S400-4FTG256C with package-aware replacement guidance, comparison parameters, and practical design considerations. It is intended to help engineers identify whether a candidate is electrically and mechanically suitable before committing to a PCB or production BOM.
直接替換替代品，適用於 XC3S400-4FTG256C — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： XC3S400-4FTG256C （相同外形與佔位） — 差異在於 System Gates, Device Type, Logic Cells, Operating Temperature, Package.
XC3S400A-4FTG256C
✅ 直接替換聯絡詢價
查看資料表 →XC3S500E-4FTG256C
✅ 直接替換📋 參考替代品（不在目錄中）
XC3S400-4FT256C
✅ 直接替換聯絡詢價
查看資料表 →XC3S400-4FTG256I
✅ 直接替換📋 參考替代品（不在目錄中）
XC3S400-4FT256I
✅ 直接替換聯絡詢價
查看資料表 →XC3S400-4FTG256C 最大額定值與電氣特性
| Device Type | Spartan-3 Field Programmable Gate Array (FPGA) |
| System Gates | 294,912 gates |
| Logic Cells | 8,064 cells |
| Architecture | Spartan-3 |
| Core Supply Voltage | 1.2 V |
| Package Type | 256-LBGA |
| Package Designation | FTG256 |
| Device Number | 173 |
| Lead-Free Construction | Lead-free |
| 工作溫度 | 0 °C to +85 °C |
| 安裝類型 | Surface Mount |
| I/O Count | 264 I/O |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
XC3S400-4FTG256C ftg256 腳位配置指南
XC3S400-4FTG256C（ftg256 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： XC3S400-4FTG256C.
請參閱 資料表 以查看完整腳位配置。
典型應用
XC3S400-4FTG256C 適用於 6 應用s: Industrial Control and Automation, Communications Protocol Conversion, Instrumentation and Data Acquisition, Video Timing and Display Control, Embedded System Control Hub, Digital Signal Processing Front End.
Industrial Control and Automation
The XC3S400-4FTG256C suits compact industrial controllers that require parallel logic, configurable I/O, and deterministic programmable behavior. Its 8,064 logic cells and 264 I/O provide substantial capacity for sequencing, interlocks, machine-state logic, and communication framing without multiple fixed-function controllers. The 1.2 V core supply supports a conventional multi-rail FPGA power architecture. Before deployment, verify the commercial 0 to 85 °C rating against the actual enclosure temperature, and confirm that every high-speed interface has adequate board-level timing margin.
推薦
Communications Protocol Conversion
The Spartan-3 architecture in the XC3S400-4FTG256C can implement parallel protocol conversion, framing, buffering, and interface adaptation in one programmable device. The available 8,064 logic cells support multiple concurrent datapaths when wide buses, lookup functions, and state machines are required, while 264 I/O simplifies connection to external transceivers. The key design consideration is timing closure: external interfaces must be constrained correctly, and the 1.2 V FPGA core rails require stable, decoupled supply delivery for reliable operation.
推薦
Instrumentation and Data Acquisition
The XC3S400-4FTG256C can consolidate acquisition control, digital filtering, calibration tables, and test sequencing around a sensor or analog front end. Its 8,064 logic cells are useful for parallel sampling pipelines and fixed-point signal processing, while the 264 I/O support sensors, counters, displays, and control registers. Designers should allocate pins according to the FTG256 package drawing and assess clock jitter and skew against the target sampling rate, because package-level routing and supply integrity can limit system performance.
推薦
Video Timing and Display Control
The XC3S400-4FTG256C can be evaluated for pixel timing, character generation, overlay processing, and control-plane logic in embedded video systems. Programmable logic allows horizontal and vertical counters, blanking intervals, and memory interfaces to be implemented in parallel rather than through a microcontroller loop. The 8,064-cell and 264-I/O resources support moderate multi-plane timing functions. Video designs must still verify supported I/O standards, clocking limits, and external memory timing against the specific Spartan-3 performance data.
推薦
Embedded System Control Hub
The XC3S400-4FTG256C is well suited to an FPGA-centered embedded hub that combines boot control, bus arbitration, watchdog logic, peripheral interfacing, and data routing. Its programmable structure allows hardware behavior to be updated through the configuration bitstream while avoiding a fixed hardware revision for every change. The commercial temperature range makes it appropriate for indoor industrial or commercial equipment. Firmware teams should define configuration memory, startup sequencing, clock sources, and watchdog recovery before finalizing the FPGA implementation.
推薦
Digital Signal Processing Front End
The XC3S400-4FTG256C can implement fixed-point filters, correlators, counters, and parallel data conditioning in hardware. Using 8,064 logic cells, a designer can trade between parallel channels and deeply pipelined sequential logic while using the 264-I/O interface for converters, memories, and test points. Performance depends on a clean clock and careful timing constraints. Use the family documentation to validate the selected speed grade, supported memory interfaces, I/O standards, and maximum operating conditions before sign-off.
推薦
推薦產品摘要
工程參考資料，適用於 XC3S400-4FTG256C — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | XC3S400A-4FTG256C | XC3S500E-4FTG256C | XC3S400-4FT256C | XC3S400-4FTG256I | XC3S400-4FT256I |
|---|---|---|---|---|---|---|
| Package | 256-LBGA (FTG256) | 256-LBGA (FTG256) | 256-LBGA (FTG256) | 256-LBGA (FT256) | 256-LBGA (FTG256) | 256-LBGA (FT256) |
| Brand | AMD | AMD | AMD | AMD | AMD | AMD |
| FPGA Family | Spartan-3 | Spartan-3A | Spartan-3E | Spartan-3 | Spartan-3 | Spartan-3 |
| Temperature Grade | Commercial | Commercial | Commercial | Commercial | Industrial | Industrial |
主要差異化特點
- Original Spartan-3 device identity (對比XC3S400A-4FTG256C)
- Commercial-temperature ordering option (對比XC3S400-4FTG256I)
- Lower logic utilization than a capacity-expanded candidate (對比XC3S500E-4FTG256C)
設計說明
Design the 1.2 V core rail and any auxiliary I/O supplies as a complete power tree with local high-frequency decoupling and controlled sequencing. Place the closest bypass capacitors directly beside the appropriate supply and ground balls, then validate return paths on the FTG256 footprint. Check the family documentation for the exposed-pad connection, permitted voltage combinations, and startup requirements before finalizing the schematic.
Use the exact FTG256 package drawing and ball table when assigning clocks, configuration pins, and high-speed interfaces. Keep clock nets short, route series-terminated signals according to the applicable I/O standard, and avoid unnecessary stubs beneath the BGA. Because the 256-LBGA footprint is escape-routing intensive, perform layer-stackup and signal-integrity review before committing to board routing.
Do not treat a same-ball-count package as sufficient proof of drop-in compatibility. For XC3S400-4FTG256C replacements, compare the exact package drawing, speed grade, temperature suffix, supply requirements, configuration behavior, I/O standards, and timing limits. After substitution, rerun synthesis, place-and-route, timing analysis, and board-level validation rather than relying only on the ordering code.
合規資訊
The product listing identifies the XC3S400-4FTG256C as lead-free. RoHS, REACH, halogen-free, and conflict-minerals status require confirmation from current manufacturer or lot documentation.
