AMD XC3S50A-4TQG144C

Overview

XC3S50A-4TQG144C from AMD (formerly Xilinx) is a Spartan-3A FPGA with 50,000 system gates, 144-pin TQFP package, -4 speed grade, and commercial temperature range (0°C to 85°C). It integrates 1728 logic cells, 120 Kbits of block RAM, and supports LVCMOS25/LVCMOS33 I/O standards for embedded control and interface bridging applications.

For engineers reviewing the XC3S50A-4TQG144C datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O voltage compatibility, configuration mode support (Master Serial, Slave Parallel), and availability of dedicated DSP slices for low-latency arithmetic.

Technical Context

The XC3S50A-4TQG144C implements a configurable logic fabric based on 4-input LUTs and flip-flops, with dedicated carry chains for arithmetic. It includes eight global clock buffers and supports up to four independent clock domains.

Configuration is performed via external SPI PROM (Master Serial mode) or parallel data bus (Slave Parallel mode); internal startup circuitry manages power-on reset and configuration verification using CRC checksum.

Key Specifications

Pinout & Package

XC3S50A-4TQG144C uses a 144-pin Thin Quad Flat Package (TQFP) with 0.5 mm pitch, 20 mm × 20 mm body size, and exposed thermal pad (GND-connected). Pin assignment follows Xilinx Spartan-3A family standard layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA-based logic implementation applications.

Compared with XC3S50A-4TQG144C, the XC3S100A-4TQG144C offers headroom for logic growth within the same footprint, while the LFE5U-12F-6BG256C trades configurability and ease of integration for ultra-low static power-making it suitable only where thermal constraints override design reuse priorities.

Availability

XC3S50A-4TQG144C is available at Aetrix Electronics and suitable for industrial automation, medical display interface, and automotive diagnostics requiring stable component supply over extended production lifecycles.

Supply support for XC3S50A-4TQG144C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

AMD acquired Xilinx in 2022 and maintains the Spartan FPGA product line for cost-sensitive, high-volume embedded applications.

The Spartan-3A family was designed for non-volatile, low-cost logic replacement in industrial control, video processing, and communications infrastructure where performance-per-watt and rapid time-to-market are critical.

FAQ

What configuration modes does the XC3S50A-4TQG144C support?

The XC3S50A-4TQG144C supports Master Serial (SPI PROM), Slave Parallel (host CPU), and JTAG boundary-scan configuration. Master Serial is most common for standalone operation, while Slave Parallel enables dynamic reconfiguration from an embedded processor. All modes are verified in the Xilinx UG332 documentation.

Does the XC3S50A-4TQG144C include built-in configuration memory?

No, the XC3S50A-4TQG144C does not include on-chip non-volatile configuration memory. It requires external SPI PROM or parallel EEPROM for bitstream storage. The FPGA loads configuration data on power-up using its internal startup sequence, which validates integrity via CRC check before enabling user logic.

Can the XC3S50A-4TQG144C operate with mixed I/O voltage standards?

Yes, the XC3S50A-4TQG144C supports mixed I/O standards per bank: each of its six I/O banks can be independently set to LVCMOS25 or LVCMOS33. This allows simultaneous connection to 2.5 V sensors and 3.3 V microcontrollers without external level shifters, provided VCCO and VREF are correctly routed per bank.

What is the maximum operating frequency of internal logic in XC3S50A-4TQG144C?

The XC3S50A-4TQG144C -4 speed grade guarantees 333 MHz maximum clock frequency for internal logic paths under worst-case commercial temperature and voltage conditions. Actual achievable frequency depends on design routing, logic depth, and clock domain crossings, but timing analysis tools confirm this limit for fully constrained designs.

Is bitstream encryption supported on XC3S50A-4TQG144C?

Yes, the XC3S50A-4TQG144C supports optional AES-128 bitstream encryption using a user-provided key stored in on-chip eFUSE. When enabled, the encrypted bitstream prevents unauthorized readback or cloning. Decryption occurs transparently during configuration, and the feature is activated via BitGen tool settings in the Xilinx ISE design suite.