XC3S400-4FG320I - 400K Gate Spartan-3 FPGA | Xilinx
Teilenummer: XC3S400-4FG320I ✗ AbgekündigtXC3S400-4FG320I Übersicht
A field-programmable gate array, or FPGA, is a reconfigurable semiconductor in which digital logic and interconnects are programmed after manufacture. An FPGA belongs to the programmable-logic hierarchy, which combines parallel gate-level logic, block RAM, programmable I/O, and embedded processing resources. This combination allows one physical device to implement control logic, protocol interfaces, data acquisition, signal processing, or complete embedded systems without changing the printed circuit board.
The XC3S400 provides 221 user I/Os for external buses, counters, serial links, memory interfaces, and mixed-signal control functions. Its 294,912 bits of block RAM support buffering, packet storage, lookup tables, and data-pipeline stages, while the -4 speed grade identifies its position within the Spartan-3 performance range. The industrial I suffix distinguishes it from commercial-temperature C variants. The 320-ball FBGA offers dense board connectivity but requires careful escape-routing, thermal analysis, and assembly control.
Spartan-3 devices combine dedicated arithmetic and logic resources with programmable interconnect and a large selection of I/O standards. The 8,064 logic cells allow concurrent datapath and control operations, while block RAM avoids extensive use of logic for storage-heavy functions. Because the I/O count is fixed at 221 for the XC3S400, system planning must reserve enough pins for clocks, configuration access, power, ground, and high-speed interfaces.
Typical uses include industrial automation, programmable logic controllers, sensor acquisition, motor-control interfaces, embedded communications, test equipment, and cost-sensitive control systems. The FPGA is especially useful where parallel logic, deterministic timing, configurable I/O, and field-updateable firmware must coexist in a compact package. Its 1.2 V core supply also allows modern low-voltage designs to consolidate multiple logic functions.
PCB implementation should use the manufacturer's pinout and recommended layout guidance rather than a generic BGA fanout. Decoupling must be placed directly at the supply and ground balls, unused configuration pins must be handled exactly as specified, and every power ball must connect to the appropriate plane or via array. The high pin count also makes inspection, solderability, and thermal cycling important production considerations.
This page combines the device's principal architecture and package data with same-family migration options, application guidance, and design checks. It focuses on the decisions that materially affect a Spartan-3 design: logic capacity, RAM, I/O availability, speed grade, temperature grade, package migration, configuration stability, and PCB implementation.
Drop-in-Alternativen für XC3S400-4FG320I – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit XC3S400-4FG320I (gleiche Bauform und Footprint) – abweichend in Mounting Type.
XC3S400-4FGG320I
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
XC3S400-4FG320C
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →XC3S400-5FGG320C
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
XC3S400A-4FGG320C
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
XC3S400-5FG320C
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →XC3S400-4FG320I Grenzwerte & elektrische Eigenschaften
| Device Type | Spartan-3 field-programmable gate array (FPGA) |
| System Gates | 400,000 gates |
| Logic Cells | 8,064 cells |
| Block RAM | 294,912 bits |
| User I/O Count | 221 I/Os |
| Core Supply Voltage | 1.2 V |
| Performance Grade | -4 speed grade |
| Gehäuse | 320-pin fine-pitch ball grid array (320-FBGA) |
| Package Dimensions | 19 mm × 19 mm |
| Montageart | Surface-mount ball grid array |
| Programmable Logic | 8,064 configurable logic cells |
| Embedded Memory | 294,912 bits of RAM |
| User I/O | 221 user I/O pins |
| Product Family | Spartan-3 FPGA family |
XC3S400-4FG320I 19 mm × 19 mm Pinbelegungsleitfaden
Pinbelegung für XC3S400-4FG320I (19 mm × 19 mm-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für XC3S400-4FG320I.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
XC3S400-4FG320I ist geeignet für 6 Anwendungs: Industrial Automation and PLC Control, Sensor Acquisition and Data Processing, Motor Control and Power Conversion, Embedded Communication Interfaces, Test and Measurement Equipment, Medical and Diagnostic Equipment.
Industrial Automation and PLC Control
The XC3S400-4FG320I fits machine-control and programmable-logic-controller designs that require deterministic parallel processing. Its 8,064 logic cells can host sequencing, interlocks, counters, state machines, and communication control, while 294,912 RAM bits provide local buffers and data-pipeline storage. The 221 user I/Os support digital sensors, encoders, solenoids, relays, and field-bus interfaces. Using the industrial I-grade option preserves an extended-temperature product designation compared with the commercial C-grade alternative. In a controller, the FPGA would normally implement the real-time control kernel and interface logic while communicating with a higher-level processor. Verify pin assignment, timing margins, and I/O standards in the manufacturer package and design documentation.
Empfohlen
Sensor Acquisition and Data Processing
The XC3S400-4FG320I is suitable for parallel sensor-acquisition systems that combine sampling control, filtering, thresholding, and data formatting in one programmable device. Its 8,064 logic cells can execute digital filtering and calibration algorithms concurrently, while 294,912 RAM bits can buffer sampled frames or intermediate results. The 221 user I/Os provide connections to sensors, multiplexers, memory devices, clocks, and data-capture logic. Compared with the -4 target, the XC3S400-5FGG320C alternative has a lower speed designation and may require timing revalidation. For high-speed analog signals, the FPGA is normally paired with external converters; its role begins after conversion where digital filtering, timestamping, and control are required.
Empfohlen
Motor Control and Power Conversion
The XC3S400-4FG320I can implement digital motor-control, position tracking, and power-conversion supervisory functions where parallel logic and configurable I/O are important. The 8,064 logic cells are suitable for current-loop control, PWM generation, fault handling, and encoder decoding, while the 221 user I/Os connect gate drivers, position sensors, protection signals, and communications. The 1.2 V core architecture allows the control logic to operate alongside external analog and power circuitry. In such a design, the FPGA should supervise timing-sensitive functions while leaving high-current switching and analog regulation to dedicated power devices. Validate timing, dead time, fault response, and thermal margins against the actual motor and power-stage requirements.
Empfohlen
Embedded Communication Interfaces
The XC3S400-4FG320I is appropriate for protocol bridges, custom communication endpoints, and multi-interface embedded controllers. Its 8,064 logic cells can support parallel-to-serial conversion, packet framing, CRC generation, state-machine control, and buffering, while 294,912 RAM bits accommodate FIFOs and packet storage. The 221 user I/Os give designers flexibility for parallel buses, clocks, control signals, and multiple external transceivers. A bridge design could use dedicated I/O standards for one interface and programmable logic for another, reducing the need for separate interface devices. When evaluating the XC3S400-5FG320C alternative, verify the slower speed grade against clock-rate, skew, and timing-margin requirements. Confirm electrical standards, termination, and impedance through the design tool and board analysis.
Empfohlen
Test and Measurement Equipment
The XC3S400-4FG320I can implement compact test, measurement, and data-capture instruments where flexible timing, parallel logic, and reconfigurable interfaces are valuable. The FPGA's 8,064 logic cells can host counters, pattern generators, timing engines, and control sequences, while 294,912 RAM bits provide sample buffers and lookup storage. Its 221 user I/Os allow connection to converters, memory, front-panel controls, and synchronization circuits. A practical instrument would divide acquisition, processing, and output functions into parallel datapaths to exploit the device's configurable architecture. Compared with a smaller FPGA, the XC3S400 provides more logic and memory capacity without changing the 320-ball footprint. For laboratory-grade instruments, pay particular attention to clock jitter, calibration, output timing, grounding, and thermal drift.
Empfohlen
Medical and Diagnostic Equipment
The XC3S400-4FG320I can support electronic modules in medical and diagnostic equipment when deterministic parallel processing, local storage, and configurable interfaces are needed. The 8,064 logic cells are suitable for control sequencing, data-path management, alarm logic, and communication framing, while 294,912 RAM bits can hold acquisition buffers. Its 221 user I/Os accommodate sensors, converters, isolated interface circuits, and service communications. A typical implementation would use the FPGA for real-time digital functions while separate circuitry handles analog acquisition, isolation, and safety monitoring. The industrial I-grade designation may suit extended-temperature equipment, but medical requirements are not automatically satisfied by the FPGA itself. Compliance, isolation, electrical safety, validation, and risk-control processes must be addressed at the finished-product level.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für XC3S400-4FG320I – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | XC3S400-4FGG320I | XC3S400-4FG320C | XC3S400-5FGG320C | XC3S400A-4FGG320C | XC3S400-5FG320C |
|---|---|---|---|---|---|---|
| Brand | Xilinx | Xilinx | Xilinx | Xilinx | Xilinx | Xilinx |
| Package | 320-FBGA | 320-FBGA - same package | 320-FBGA - same package | 320-FBGA - same package | 320-FBGA - same package | 320-FBGA - same package |
| Family | Spartan-3 | Spartan-3 | Spartan-3 | Spartan-3 | Spartan-3A | Spartan-3 |
| Speed Grade | -4 | -4 | -4 | -5 | -4 | -5 |
| Temperature Designation | I - industrial | I - industrial | C - commercial, 0°C to +85°C | C - commercial, 0°C to +85°C | C - commercial, 0°C to +85°C | C - commercial, 0°C to +85°C |
Wichtigste Unterscheidungsmerkmale
- Industrial-grade designation within the Spartan-3 portfolio (vs. XC3S400-4FG320C)
- Highest documented functional match among the same-package choices (vs. XC3S400-4FGG320I)
- One performance-grade step faster than the -5 alternatives (vs. XC3S400-5FGG320C)
Designhinweise
Treat the 320-FBGA as a high-density routing problem rather than a generic BGA. Assign power and ground balls from the manufacturer pinout, provide uninterrupted plane connections with dense via arrays, and route escape signals according to the recommended layer stack-up. The 19 mm × 19 mm package leaves less routing area than its 221 user I/Os might initially suggest. Run DRC and assembly-rule checks before releasing the layout because a single misplaced or omitted power connection can prevent configuration or cause unstable operation.
Use the manufacturer's recommended power-supply topology and separate high-current and quiet return paths. Place the required bypass capacitors at the associated package balls with short, low-inductance connections, and confirm that every power and ground ball has the specified via treatment. The device's 1.2 V core supply does not mean that all supply requirements are identical: auxiliary rails, configuration pins, termination, and I/O power may have separate limits. Validate startup current, sequencing, voltage tolerance, and worst-case power-state behavior in the complete design.
Do not substitute an FPGA solely because the package and gate count appear similar. The XC3S400-4FG320I has a -4 speed designation and industrial I grade, while several same-package alternatives use -5 speed or commercial C grades. Before substitution, compare the pinout, configuration scheme, I/O standards, block-RAM organization, supported clocking, timing limits, and temperature requirements. Re-run synthesis, implementation, timing analysis, and power analysis; a nominal pin-compatible package does not guarantee equivalent system timing or thermal performance.
Preserve configuration stability by following the manufacturer's guidance for configuration pins, pull-up or pull-down components, programming access, and startup behavior. Keep sensitive clock and configuration routing away from noisy switching nodes, and maintain continuous return paths beneath high-speed interfaces. Because no complete pin list is reproduced here, use the manufacturer pin-description table and land-pattern drawing as the controlling documents. Record any package, speed, or temperature-grade substitution in the schematic and BOM notes to prevent assembly errors.
Compliance-Informationen
The product listing identifies an FPGA and industrial temperature grade but does not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. AEC-Q100 is not applicable unless a separate automotive qualification is documented.
