XC3S50-4PQG208I - Spartan-3 FPGA, 50K Gates, PQFP-208 | AMD/Xilinx
MPN： XC3S50-4PQG208I ✓ 啟用中XC3S50-4PQG208I 概覽
An FPGA (field-programmable gate array) is a reconfigurable integrated circuit whose logic fabric, block RAM, and I/O routing can be redefined after manufacture via a hardware description language (HDL) bitstream. FPGAs sit within the broader programmable logic category alongside CPLDs, and they are commonly chosen over ASICs for low- to mid-volume designs, prototyping, and applications requiring post-deployment firmware updates. The Spartan-3 family positioned Xilinx at the low-cost, high-volume end of the FPGA market, balancing logic density with low static power on a 90 nm process.
Key features of the XC3S50-4PQG208I include 50K system gates, 1,728 logic cells organized across four programmable function blocks (CLB rows), 12 dedicated multiplier blocks for embedded DSP (18x18 signed multipliers), distributed SelectRAM, and SelectIO technology supporting LVCMOS, LVTTL, SSTL, and HSTL signaling standards. The 208-pin PQFP provides 124 usable user I/Os once power and JTAG pins are subtracted, and is the largest PQFP offered in the Spartan-3 family.
Designers should plan for an external 50 MHz to 100 MHz clock source, a JTAG header for in-system programming via the Platform Flash or iMPACT tools, and decoupling per Xilinx application note UG110. The PQFP-208 footprint is legacy-friendly but offers less thermal performance than BGA packages; with the I-suffix industrial temperature rating the part remains viable for outdoor, automotive under-hood, and factory automation deployments.
Typical applications include industrial motor control, low-cost display controllers, glue logic consolidation, and legacy communication bridges. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical PCB-layout design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 XC3S50-4PQG208I — 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： XC3S50-4PQG208I （相同外形與佔位） — 差異在於 Package Type, Device Type, Logic Cells, Process Technology, System Gates.
XC3S50-4PQG208C
✅ 直接替換聯絡詢價
查看資料表 →XC3S50-5PQG208I
✅ 直接替換📋 參考替代品（不在目錄中）
XC3S200-4PQG208I
✅ 直接替換📋 參考替代品（不在目錄中）
XC3S1000-4PQG208I
✅ 直接替換📋 參考替代品（不在目錄中）
XC3S50-4PQG208I 最大額定值與電氣特性
| Family | Spartan-3 |
| Device Type | FPGA - Field Programmable Gate Array |
| System Gates | 50,000 |
| Logic Cells | 1,728 |
| Logic Blocks (CLBs) | 192 |
| Total RAM Bits | 73,728 |
| Number of User I/O | 124 |
| Core Supply Voltage | 1.14 V to 1.26 V |
| Process Technology | 90 nm CMOS |
| Maximum Internal Frequency | 630 MHz |
| Package Type | 208-pin PQFP (BFQFP) |
| 安裝類型 | Surface Mount |
| Operating Temperature (Industrial -I) | -40C to +100C junction |
| Dedicated Multipliers (DSP48-like) | 4 (18x18-bit signed) |
| Lead-Free / RoHS | Yes (G suffix indicates lead-free) |
| JTAG Support | Yes (IEEE 1149.1 boundary scan + configuration) |
XC3S50-4PQG208I 208-pin pqfp (bfqfp) 腳位配置指南
XC3S50-4PQG208I（208-pin pqfp (bfqfp) 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： XC3S50-4PQG208I.
請參閱 資料表 以查看完整腳位配置。
典型應用
XC3S50-4PQG208I 適用於 6 應用s: Industrial Motor Control, Low-Cost Display Controller, Legacy Communication Bridge, Automotive Infotainment Auxiliary Logic, Test and Measurement Instrumentation, Glue Logic Consolidation.
Industrial Motor Control
The XC3S50-4PQG208I is well-suited for industrial motor control applications including stepper and brushless DC (BLDC) motor drive controllers. Its 1,728 logic cells provide sufficient capacity to implement encoder decoding (QEI), PWM generation (up to 6 channels at 50 kHz), PI velocity/torque loops, and safety logic in a single device. The 124 user I/Os accommodate Hall-effect sensor inputs, multi-axis encoder interfaces, fault inputs, gate-driver enable signals, and CAN/UART communication links. The industrial -40C to +100C temperature grade ensures operation in factory-floor enclosures and outdoor drive cabinets. Designers benefit from the dedicated 18x18 multipliers for field-oriented control (FOC) and space-vector modulation math. The PQFP-208 footprint, while legacy, supports hand-solderable prototyping and rework-friendly manufacturing for low-to-mid volume motor drive products.
推薦
Low-Cost Display Controller
The XC3S50-4PQG208I serves as a flexible timing controller and image-processing engine for cost-sensitive TFT-LCD and OLED display applications. With 73,728 bits of block RAM plus distributed SelectRAM, designers can implement line buffers and small frame buffers for color-space conversion, gamma correction, and on-screen display overlays. The SelectIO banks support LVCMOS, SSTL, and HSTL signaling at speeds compatible with mid-range LVDS display interfaces when LVDS pairs are routed correctly. The 124 user I/Os easily accommodate parallel RGB, 8-bit/16-bit MCU-style interfaces, and SPI/QSPI configuration to display driver ICs. The 90 nm process keeps static power low enough for embedded display modules, and the legacy PQFP package is well-suited to 2-layer and 4-layer consumer display PCBs.
推薦
Legacy Communication Bridge
The XC3S50-4PQG208I excels as a glue-logic bridge between legacy parallel buses (PC/104, ISA, VME, proprietary backplanes) and modern serial interfaces such as UART, SPI, I2C, and CAN. Its 1,728 logic cells comfortably implement bus-state machines, FIFO buffers using block RAM, and protocol converters for industrial retrofit applications. The industrial temperature grade makes the part viable for outdoor telecommunication cabinets and field-instrumentation bridging. The PQFP-208 footprint is convenient for through-hole-style retrofit boards where BGA reflow would be impractical. The 50K-gate capacity also allows modest error-correction or encryption acceleration, useful for secure field-bus gateways.
推薦
Automotive Infotainment Auxiliary Logic
The XC3S50-4PQG208I handles auxiliary video routing, button-matrix scanning, and peripheral arbitration in automotive infotainment head units where a main application processor offloads real-time I/O tasks. The dedicated 18x18 multipliers enable moderate image-scaling and blending operations without burdening the host CPU. The industrial temperature rating is well within automotive cabin environments. The PQFP package supports automotive Tier-1 manufacturing lines that have not transitioned to BGA-only assembly. Designers integrate CAN-FD, LIN, and MOST network bridges alongside the host SoC, leveraging the FPGA's flexibility for late-stage feature additions and OEM-specific customization.
推薦
Test and Measurement Instrumentation
The XC3S50-4PQG208I is ideal for low-channel-count test and measurement instruments such as benchtop logic analyzers, protocol exercisers, and arbitrary waveform generators where waveform synthesis, pattern generation, and trigger logic must run deterministically. Block RAM stores pre-loaded stimulus patterns while logic cells implement custom protocol decoders (I2C, SPI, UART, JTAG) and timing analyzers with sub-microsecond resolution. The SelectIO flexibility lets the FPGA interface directly with 3.3V or 2.5V DUT signals without level shifters. The PQFP-208 footprint is convenient for hand-prototyped instrument front-ends, and the I-suffix industrial temperature rating allows bench or rack operation in standard environments.
推薦
Glue Logic Consolidation
The XC3S50-4PQG208I replaces dozens of legacy 74-series logic packages by consolidating address decoding, bus arbitration, interrupt steering, and timing generation into a single reprogrammable device. Engineers migrating legacy designs from discrete TTL/CMOS logic to programmable logic appreciate the 50K-gate density, the 124 user I/Os that accommodate wide address/data buses, and the JTAG-based in-system reprogrammability for late-stage bug fixes. The PQFP-208 footprint fits onto retrofitted boards with minimal PCB rework, and the legacy ISE WebPACK toolchain remains freely available for engineers maintaining installed equipment. Power consumption stays modest thanks to the low-static-power Spartan-3 architecture.
推薦
推薦產品摘要
工程參考資料，適用於 XC3S50-4PQG208I — 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 | XC3S50-4PQG208C | XC3S50-5PQG208I | XC3S200-4PQG208I | XC3S1000-4PQG208I |
|---|---|---|---|---|---|
| Brand | Xilinx (AMD) | Xilinx (AMD) | Xilinx (AMD) | Xilinx (AMD) | Xilinx (AMD) |
| Package | 208-pin PQFP (BFQFP) | 208-pin PQFP (BFQFP) - same | 208-pin PQFP (BFQFP) - same | 208-pin PQFP (BFQFP) - same | 208-pin PQFP (BFQFP) - same |
| System Gates | 50,000 | 50,000 | 50,000 | 200,000 | 1,000,000 |
| Logic Cells | 1,728 | 1,728 | 1,728 | 4,320 | 17,280 |
| User I/O | 124 | 124 | 124 | 141 | 141 |
| Total RAM Bits | 73,728 | 73,728 | 73,728 | 221,184 | 442,368 |
| Dedicated Multipliers (18x18) | 4 | 4 | 4 | 12 | 24 |
| Temperature Grade | Industrial -40C to +100C | Commercial 0C to +85C | Industrial -40C to +100C | Industrial -40C to +100C | Industrial -40C to +100C |
| Speed Grade | -4 | -4 | -5 (faster) | -4 | -4 |
主要差異化特點
- Lowest-cost 50K-gate Spartan-3 with industrial temperature rating in PQFP-208 (對比XC3S50-4PQG208C)
- Faster speed grade option available in same footprint (對比XC3S50-5PQG208I)
- PQFP-208 footprint offers hand-solderable prototype convenience over BGA packages (對比XC3S50-4FGG256I)
設計說明
Estimated: VCCINT core supply must be regulated to 1.14V to 1.26V with a peak current of approximately 200 mA during configuration plus the dynamic current proportional to toggle rate. Use a low-noise LDO (such as a TPS7A45 set to 1.2V) or a switching regulator followed by an LDO post-filter. Each VCCO bank can draw tens of milliamps; place 100 nF X7R bypass caps adjacent to every supply pin and bulk 10 uF tantalum or ceramic on each bank rail. Spartan-3 power-on ramp must follow the monotonic sequence documented in DS099-1, with VCCINT leading VCCO by no more than the datasheet-specified window to avoid I/O buffer latch-up.
The 208-pin PQFP package has a 1.0 mm pitch; route signals on at least 4 inner layers with 0.15 mm trace width and 0.15 mm clearance. Escape via fanout should use staggered microvias or dog-bone through-vias. Provide a continuous ground plane on layer 2 directly beneath the device to minimize return-path inductance. Place configuration-mode resistors (M0, M1, M2 pull-ups/downs) within 25 mm of the package pins. Reserve a JTAG header footprint (2x5 0.1-inch header or Tag-Connect TC2030) near the device for in-system programming access. Plan thermal copper pours across all layers tied to the central GND pad to spread heat away from internal switching.
Do not confuse the Spartan-3 (XC3S) part with the Spartan-3A (XC3SxxA), Spartan-3E (XC3SxxE), or Spartan-3AN (XC3SxxAN) families - they are NOT pin-compatible even when the package code matches. Designers migrating within Spartan-3 (e.g. XC3S50 to XC3S200 in PQFP-208) must verify pin-by-pin compatibility in DS099 module 3 before committing PCB artwork. A second common pitfall is leaving the PROG_B pin floating - tie it to VCCO via a 4.7 kohm pull-up so the device does not enter spurious configuration cycles. Finally, never drive the JTAG TDI pin from an active source while the device is also configured from a Platform Flash PROM; resolve bus contention with the series resistor approach shown in Xilinx app-note UG110.
合規資訊
G-suffix confirms lead-free matte-tin finish compliant with RoHS directives. Spartan-3 family FPGAs are not AEC-Q100 qualified; for automotive safety-critical applications, evaluate Spartan-6 or Artix-7 with AEC-Q100 documentation. Halogen-free status was not explicitly stated in the verified web data and is marked unknown.
