XC3S400-4FT256C - 400K Gate Spartan-3 FPGA | AMD
料号： XC3S400-4FT256C ✗ 停产XC3S400-4FT256C 概述
A field-programmable gate array, or FPGA, is a semiconductor whose digital logic is configured after manufacture. An FPGA belongs to the programmable-logic hierarchy, combining configurable logic blocks, programmable I/O, embedded memory, dedicated hard multipliers, and clock-management resources. This makes the Spartan-3 family useful when engineers need hardware-level parallelism, rapid design changes, or compact implementation of complex digital systems without committing to a custom application-specific integrated circuit.
The verified listing identifies 400,000 system gates and 8,064 logic cells for the XC3S400 device. It provides 173 I/O in a 256-LBGA package and uses a 1.2 V core voltage. Related Spartan-3 data identifies 90 nm fabrication technology and a 630 MHz figure for the XC3S400-4FTG256C comparison variant; those values should not be transferred to XC3S400-4FT256C without confirmation from its own manufacturer datasheet.
The device is suitable for parallel data processing, custom interface control, embedded signal processing, communications infrastructure, test equipment, and industrial control systems. Its 173 I/O permit substantial board-level connectivity, while the 8,064-cell logic resource supports parallel datapaths and state machines. The FT256 package can also simplify component density compared with larger leaded packages, but it requires careful PCB layout, thermal analysis, and BGA assembly capability.
The commercial -4 grade is intended for cost-optimized designs rather than the extreme operating range implied by an industrial temperature suffix. Before releasing a design, engineers should verify the exact I/O standards, supported memory interfaces, configuration requirements, power-up behavior, and package pinout against the manufacturer documentation for XC3S400-4FT256C.
A critical design consideration is that the FT256 package requires exact land-pattern, solder-mask, paste, via, and assembly-process control. Power rails and decoupling should be implemented according to the manufacturer's guidance, while configuration and programming interfaces should be checked for signal-integrity and termination requirements before layout signoff.
This page consolidates verified distributor pricing, same-footprint Spartan-3 alternatives, application guidance, and design cautions that are not presented together on a manufacturer product page. It also distinguishes confirmed target-device facts from parameters that remain unavailable in the supplied source data.
直接替换替代料： XC3S400-4FT256C ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： XC3S400-4FT256C （相同外形与封装尺寸） ——差异在于 Mounting Type, Package, System Gates.
XC3S400-4FTG256C
✅ 直接替换📋 参考替代料（不在目录中）
XC3S400-4FTG256I
✅ 直接替换📋 参考替代料（不在目录中）
XC3S400A-4FT256C
✅ 直接替换📋 参考替代料（不在目录中）
XC3S400A-4FTG256C
✅ 直接替换联系询价
查看数据手册 →XC3S500E-4FTG256C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
XC3S400-4FT256C 最大额定值与电气特性
| Device Type | Spartan-3 Field Programmable Gate Array (FPGA) IC |
| System Gates | 400,000 gates |
| Configurable Logic Cells | 8,064 cells |
| User I/O | 173 I/O |
| Core Voltage | 1.2 V |
| Performance Grade | -4 speed grade |
| Temperature Grade | Commercial |
| 封装 | 256-LBGA |
| Package Type | FTBGA-256 |
| 安装类型 | Surface Mount |
| Terminal Type | Ball |
| Terminal Count | 256 balls |
| Logic Family | Spartan-3 |
| RoHS 状态 | Compliant |
XC3S400-4FT256C ftbga-256 引脚配置指南
XC3S400-4FT256C（ftbga-256 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： XC3S400-4FT256C.
请参阅 数据手册 以查看完整引脚配置。
典型应用
XC3S400-4FT256C 适用于 6 应用s: Industrial Parallel Data Acquisition, Communications Interface Controller, Test and Measurement Instrumentation, Embedded Signal Processing, Industrial Control and Automation, Programmable Interface Consolidation.
Industrial Parallel Data Acquisition
The XC3S400-4FT256C fits parallel acquisition and control systems that require deterministic digital logic rather than a microcontroller executing sequential instructions. Its reported 8,064 configurable logic cells can implement sampling pipelines, filters, packetizers, and interface state machines, while 173 I/O provide connections to sensors, converters, and test equipment. The -4 grade supplies a defined performance class for timing closure, although the unavailable maximum-frequency specification must be confirmed for the selected clock. In a board design, engineers should use the exact manufacturer FT256 land pattern, isolate noisy inputs from sensitive routing, and validate every voltage domain against the device's supported I/O standards.
推荐
Communications Interface Controller
The XC3S400-4FT256C can serve as a programmable communications interface when a design needs custom framing, buffering, timing, or protocol conversion. The reported 400,000 system gates and 8,064 logic cells are well suited to parallel datapaths and multiple clock domains, while 173 I/O offer substantial connectivity to transceivers and supporting controllers. Engineers should not infer protocol support solely from the gate count; instead, they should confirm clock-management resources, I/O standards, and maximum operating frequency from the manufacturer documentation. PCB planning should reserve clean routing for clocks, controlled impedance for high-speed links, and an unambiguous configuration path for reliable field programming.
推荐
Test and Measurement Instrumentation
The XC3S400-4FT256C is appropriate for programmable test equipment requiring flexible timing, pattern generation, measurement control, and data formatting. Its reported 8,064 configurable logic cells and 173 I/O permit concurrent channels, state machines, counters, and instrument-bus interfaces, while the -4 performance grade provides a consistent timing target. The design must be constrained and timed for the intended clock because the supplied records do not provide a maximum operating frequency. Engineers should separate analog and high-impedance inputs from digital routing, provide deterministic clocking, and follow the manufacturer's power and decoupling guidance to avoid measurement errors caused by supply disturbance.
推荐
Embedded Signal Processing
The XC3S400-4FT256C can implement parallel filtering, correlation, error correction, and real-time signal-processing pipelines in programmable logic. The reported 400,000 system gates provide substantially more parallel logic capacity than a small microcontroller, and the dedicated architecture can avoid iterative software bottlenecks. Resource allocation must be checked against the exact number of block RAM blocks, multipliers, clock domains, and I/O standards, none of which are quantified in the supplied source data. Designers should use synchronous design practices, constrain all clocks and I/O timing, and analyze worst-case routing delay before treating the -4 grade as sufficient for a production timing closure.
推荐
Industrial Control and Automation
The XC3S400-4FT256C is suitable for machine-control logic that combines parallel I/O, sequencing, communications, and deterministic hardware timing. Its 173 reported I/O support connections among sensors, actuators, safety-adjacent controls, and industrial communications, while the 8,064-cell logic fabric can implement multiple control tasks concurrently. Because this is a commercial-grade -4 part, engineers must verify the exact operating-temperature requirements of the machine environment and use an industrial-grade alternative if the published limits are insufficient. Layout should include careful power planning, grounded return paths, isolation boundaries for external wiring, and tested configuration recovery procedures.
推荐
Programmable Interface Consolidation
The XC3S400-4FT256C can consolidate several legacy parallel interfaces into a single programmable-logic device when a board needs custom routing, buffering, or protocol adaptation. The reported 173 I/O and 8,064 configurable logic cells are suitable for moderate-width data buses and asynchronous state-machine control, while the 256-LBGA package minimizes board area. Pin compatibility with a specific external component cannot be assumed; engineers must build a complete I/O mapping and check voltage domains, drive strength, timing, and supported standards. The layout should reserve BGA escape routes and test access, and the FPGA design should include initialization and fault handling for any interface that affects system safety.
推荐
推荐产品汇总
工程参考数据： XC3S400-4FT256C ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | XC3S400-4FTG256C | XC3S400-4FTG256I | XC3S400A-4FT256C | XC3S400A-4FTG256C | XC3S500E-4FTG256C |
|---|---|---|---|---|---|---|
| Package | 256-LBGA (FT256) | 256-LBGA (FT256) | 256-LBGA (FT256) | 256-LBGA (FT256) | 256-LBGA (FT256) | 256-LBGA (FT256) |
| Brand | AMD | AMD | AMD | AMD | AMD | AMD |
| FPGA Family | Spartan-3 | Spartan-3 | Spartan-3 | Spartan-3A | Spartan-3A | Spartan-3E |
| Performance Grade | -4 speed grade | -4 speed grade | -4 speed grade | -4 speed grade | -4 speed grade | -4 speed grade |
关键差异点
- Closest reported resource match in the same FT256 footprint （对比 XC3S400-4FTG256C)
- Commercial target with an industrial same-footprint option （对比 XC3S400-4FTG256I)
- Direct 256-LBGA ordering configuration （对比 XC3S400A-4FT256C)
- Lower-capacity target allows upgrade-path assessment without a larger package （对比 XC3S500E-4FTG256C)
设计说明
Use the official XC3S400 FT256 package drawing to control pad, solder-mask, paste, and via geometry. A 256-BGA design demands an escape strategy for configuration, clocks, power, and high-fanout I/O; power and ground balls should be connected through the shortest practical via arrays. PCB fabrication and assembly capability should be qualified before layout release because the verified distributor records identify the target as a 256-LBGA rather than a leaded package.
The verified Mouser listing identifies a 1.2 V core for the XC3S400-4FT256C. Follow the manufacturer power-distribution and decoupling requirements rather than deriving the network from this page, because I/O voltage domains, auxiliary rails, sequencing, and current limits are not included in the supplied records. Validate the assembled board across startup, load, and temperature, and monitor the 1.2 V rail for excessive transient impedance or ground bounce.
Do not treat the FT256 package designation as proof that every Spartan-3 alternative is electrically interchangeable. Before replacing XC3S400-4FT256C, compare configuration pins, I/O standards, voltage tolerances, clock resources, memory and multiplier availability, timing, and bitstream support. In particular, the XC3S400-4FTG256C comparison source states that some electrical characteristics differ, so an engineering change should include schematic review, timing recompilation, and hardware regression tests.
Keep clock distribution, configuration signals, and sensitive high-speed interfaces away from noisy switching nodes and switching-power supply loops. Use continuous return paths, controlled-impedance routing where required, and defined test points for configuration and clock debugging. Because the supplied records do not include the official pinout, engineers must not assign ball locations from general FT256 conventions; all routing must be checked against the exact XC3S400-4FT256C package table.
合规信息
The verified LCSC product record marks XC3S400-4FT256C as RoHS compliant. The supplied records do not establish REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status.
