XC3S50-4VQG100I - 50K Spartan-3 FPGA, 1.2V, 100-TQFP | AMD
MPN: XC3S50-4VQG100I ✗ End of LifeXC3S50-4VQG100I Overview
A field-programmable gate array, or FPGA, is a programmable digital semiconductor that combines configurable logic blocks, programmable interconnects, and I/O resources into a single integrated circuit. FPGAs sit within the broader semiconductor hierarchy: FPGA -> programmable logic device -> digital logic IC. Unlike a fixed-function application-specific integrated circuit, an FPGA can be reconfigured after manufacture, allowing designers to implement parallel logic, control, data acquisition, communication, and embedded system functions in one device.
The XC3S50-4VQG100I provides 1,728 logic cells and 63 user I/O pins according to the verified distributor and comparison data. The 1.2 V core supply and 90 nm process technology place the device in the Spartan-3 generation of AMD/Xilinx programmable logic. Its 100-pin surface-mount package provides a smaller footprint than higher-pin-count Spartan-3 devices while retaining enough I/O for control, interface, and low-to-moderate-speed parallel systems. The listed lead-free packaging designation is suitable for modern manufacturing processes, although individual procurement channels should be checked for current stock and traceability.
The -4 designation identifies the device performance grade within the Spartan-3 naming system, while the I suffix identifies the industrial-temperature configuration. Verified cross-reference information lists an industrial operating range of -40 °C to +100 °C for this part. The 630 MHz figure is a device-family or comparison value and should not be treated as a guarantee that every design or I/O interface will operate at that frequency. Actual timing performance depends on the selected Spartan-3 device, clocking, I/O standards, logic utilization, routing, and timing constraints.
Typical uses include industrial control logic, sensor and signal conditioning, communication interfaces, test equipment, embedded control, consumer electronics, and general-purpose prototyping. Because the FPGA is programmable, designers can implement parallel datapaths, state machines, protocol controllers, or custom interfaces without designing a fixed ASIC. The 63 I/O count is particularly useful for designs requiring multiple digital control or status signals while keeping the package reasonably compact.
The main design consideration is package and pin planning. This page synthesizes verified distributor specifications, source links, and practical selection guidance; it does not invent pin functions or timing details. Before layout, engineers should obtain the official Spartan-3 family documentation and confirm the exact VQG100 pin map, bank voltages, configuration requirements, decoupling recommendations, and supported I/O standards for the selected board design.
For replacements, the XC3S50-4VQG100C and related 100-pin Spartan-3 devices can be considered as same-footprint candidates where temperature grade, speed grade, device revision, and configuration details are acceptable. The XC3S50A-4VQG100I is a Spartan-3A-family option with related package information, but Spartan-3 and Spartan-3A devices should not be treated as automatically interchangeable without checking the complete pinout, configuration interface, electrical characteristics, and design-tool support.
Drop-in alternatives for XC3S50-4VQG100I — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with XC3S50-4VQG100I (same form factor and footprint) — differing in Logic Cells, Package, Device Type, Temperature Grade, Process Technology.
XC3S50-4VQG100C
✅ Drop-In📋 Reference alternative (not in catalog)
XC3S50A-4VQG100I
✅ Drop-In📋 Reference alternative (not in catalog)
XC3S50-4VQ100I
✅ Drop-InContact for price
View Datasheet →XC3S50-5VQG100C
✅ Drop-InContact for price
View Datasheet →XC3S500E-4VQG100I
✅ Drop-In📋 Reference alternative (not in catalog)
XC3S50-4VQG100I Maximum Ratings & Electrical Characteristics
| Device Type | Spartan-3 field-programmable gate array (FPGA) |
| System Gates | 50,000 gates |
| Logic Cells | 1,728 logic cells |
| Logic Blocks | 192 logic blocks |
| User I/O | 63 I/O |
| Supply Voltage | 1.2 V |
| Maximum Frequency | 630 MHz |
| Process Technology | 90 nm |
| Package | 100-TQFP |
| Pin Count | 100 pins |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +100 °C |
| Temperature Grade | Industrial |
| Lead-Free Status | Lead Free |
| Programmable Logic Device Type | FPGA |
| Family | Spartan-3 |
| Speed Grade | -4 |
XC3S50-4VQG100I 100-tqfp Pin Configuration Guide
Pin configuration for XC3S50-4VQG100I (100-tqfp package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for XC3S50-4VQG100I.
Refer to the datasheet for full pin configuration.
Typical Applications
XC3S50-4VQG100I is suitable for 6 applications: Industrial Control and Automation, Data Acquisition and Signal Conditioning, Communication Interface Controller, Test and Measurement Instrumentation, Embedded Consumer and Hobby Projects, Custom Security and Access-Control Logic.
Industrial Control and Automation
The XC3S50-4VQG100I fits compact industrial-control logic that requires programmable sequencing, monitoring, and interface handling. Its 1,728 logic cells and 63 I/O pins provide a practical resource level for control state machines, interlocks, alarm logic, counter inputs, and actuator outputs. The industrial I suffix and reported -40 °C to +100 °C range make it more suitable for extended-temperature equipment than the commercial XC3S50-4VQG100C. In an implementation, engineers would use the FPGA alongside gate drivers, isolation, analog front ends, and industrial communication transceivers. Verify the official power-bank requirements, I/O tolerances, and timing budget because the verified snippets do not provide complete electrical limits.
Recommended
Data Acquisition and Signal Conditioning
The XC3S50-4VQG100I is suitable for parallel data-acquisition and conditioning logic where multiple sensor outputs must be sampled, filtered, timestamped, or routed. The 63 available I/O pins support concurrent digital channels, while the programmable architecture can implement parallel datapaths and protocol handling without a custom ASIC. A practical system would pair the FPGA with amplifiers, analog switches, ADC stages, and level-shifting devices. The 1.2 V core supply helps simplify power planning, but every external interface still requires verified voltage limits, input thresholds, output timing, and system grounding checks. Use the official device documentation for acquisition-edge timing and pin-specific standards.
Recommended
Communication Interface Controller
The XC3S50-4VQG100I can implement a dedicated communication controller for legacy or proprietary interfaces, including framing, CRC generation, buffering, and command parsing. Its 63 I/O pins allow parallel control and data signals to coexist with an external transceiver, while 1,728 logic cells provide space for multiple state machines and FIFO-like pipelines. In a design, the FPGA would connect to a transceiver such as RS-485 or Ethernet physical-layer hardware, with software or firmware coordinating higher-level behavior. Timing closure must be checked against the selected transceiver and interface clock. Because Spartan-3 is a mature device family, confirm that the required synthesis tool, constraints flow, and programming support remain available for maintenance.
Recommended
Test and Measurement Instrumentation
The XC3S50-4VQG100I can serve as the programmable control core in compact test and measurement equipment where sequencing, pattern generation, timing supervision, and status reporting must be adjusted after manufacture. The Spartan-3 architecture supports reusable logic for instrument control and data paths, while the 100-pin TQFP package keeps the board manageable. Engineers can pair it with precision amplifiers, high-speed interface devices, memory, and precision references to build a configurable measurement platform. The reported 630 MHz device figure should be treated as a maximum comparison value rather than guaranteed instrument bandwidth. Confirm acquisition timing, I/O standards, jitter expectations, and synchronization requirements in the official timing and pin documentation.
Recommended
Embedded Consumer and Hobby Projects
The XC3S50-4VQG100I remains useful for education, prototyping, custom controllers, and compact embedded products where reprogrammability matters more than modern FPGA density. Its 1,728 logic cells and 63 I/O pins are sufficient for multiple digital interfaces, simple processors, control logic, and display or sensor interfaces in appropriately designed systems. The -4 speed grade supports timing-oriented classroom and prototype work, although actual performance depends on design constraints. Designers should account for the age of the Spartan-3 toolchain and ensure a reliable source for programming devices and documentation. A modern MCU may be preferable for very low-cost or software-heavy products, but the FPGA offers parallel logic and hardware flexibility that can simplify certain designs.
Recommended
Custom Security and Access-Control Logic
The XC3S50-4VQG100I can support compact access-control, keypad, credential, or alarm systems in which deterministic parallel logic and custom protocols are valuable. Its 63 I/O pins can accommodate key matrices, indicator signals, lock controls, and external status inputs, while the programmable logic can implement debouncing, sequencing, event logging, and communication framing. A practical implementation would use the FPGA with secure I/O buffering, transceivers, and a supervisory controller. Because this is an older device family, developers should evaluate physical tamper resistance, encryption implementation, configuration loading, and update mechanisms rather than treating programmable logic as a complete security solution. Verify the exact I/O limits and availability before designing a security-critical deployment.
Recommended
Recommended Products Summary
Engineering reference data for XC3S50-4VQG100I — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | XC3S50-4VQG100C | XC3S50A-4VQG100I | XC3S50-4VQ100I | XC3S50-5VQG100C | XC3S500E-4VQG100I |
|---|---|---|---|---|---|---|
| Package | 100-TQFP | 100-TQFP - same package class | 100-TQFP - same package class | 100-TQFP - same package class | 100-TQFP - same package class | 100-TQFP - same package class |
| Brand | AMD | AMD | AMD | AMD | AMD | AMD |
| Temperature Grade | Industrial | Commercial | Industrial | Industrial | Commercial | Industrial |
| Speed Grade | -4 | -4 | -4 | -4 | -5 | -4 |
Key Differentiators
- Industrial temperature ordering option (vs XC3S50-4VQG100C)
- Lower I/O burden in the same package class (vs XC3S50A-4VQG100I)
- Matched -4 speed designation (vs XC3S50-5VQG100C)
Design Notes
Use the official VQG100 package drawing and Spartan-3 power-supply guidance before assigning pins or laying out the board. The verified data establishes a 100-pin TQFP package but does not provide the complete pin map, so do not infer configuration, clock, VCCA, or VCCG assignments from distributor snippets. Keep power and ground planes continuous, place decoupling close to the relevant supply pins, and provide the configuration circuitry required by the selected Spartan-3 device and programming method.
Treat the reported 630 MHz value as a device comparison figure, not a guaranteed signal rate. Establish achievable timing from the official timing data, the selected clock source, I/O standard, trace topology, and external transceiver specifications. For external interfaces, use short controlled-length routes, appropriate termination, and series damping where required. The 63-I/O count is useful for parallel systems, but every external signal also requires voltage-domain and timing verification.
Do not substitute XC3S50-4VQG100C, XC3S50A-4VQG100I, XC3S50-4VQ100I, XC3S50-5VQG100C, or XC3S500E-4VQG100I solely because each is associated with a 100-pin TQFP package. Compare the complete pinout, I/O count, temperature grade, speed grade, configuration method, supply architecture, timing, and device identifiers. In particular, the XC3S50A device is from a different family, and the -5 device changes the speed-grade relationship.
Plan the 1.2 V core rail separately from any I/O-bank supplies and configuration interface requirements. Validate source current, startup behavior, tolerance, sequencing, and decoupling against the official device documentation before schematic release. The verified snippets identify the 1.2 V core supply but do not provide the complete regulator recommendations, so use manufacturer application guidance rather than generic capacitor values or assumptions about available power rails.
Compliance Information
The verified distributor description identifies the package as lead free. Separate RoHS, REACH, halogen-free, and conflict-minerals declarations were not supplied. AEC-Q100 is not applicable because the device is classified as an FPGA rather than an automotive-qualified component in the provided data.
