AMD XC3S50-5VQG100C

Overview

XC3S50-5VQG100C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 50,000 system gates, 1728 logic cells, 128 kB of total block RAM, 100-pin VQFP package, and -5 speed grade supporting 333 MHz system clock operation. It is used in industrial control logic, digital video interface bridging, and low-cost reconfigurable embedded systems.

For engineers reviewing the XC3S50-5VQG100C datasheet, pinout, applications, or equivalent options, key selection factors include I/O count (63 user I/Os), differential signaling support (LVDS, LVTTL), configuration interface (JTAG, Master Serial), and temperature range (0°C to 85°C commercial).

Technical Context

The XC3S50-5VQG100C implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, and dedicated carry logic. It supports multi-voltage I/O banks (1.2 V, 1.5 V, 2.5 V, 3.3 V) and includes Digital Clock Managers (DCMs) for clock synthesis and phase alignment.

Configuration is performed via slave serial, master serial, or JTAG modes using external PROM or processor-controlled loading. The device requires separate VCCINT (1.2 V), VCCAUX (2.5 V), and VCCO (I/O voltage) supplies with strict power sequencing.

Key Specifications

Pinout & Package

XC3S50-5VQG100C is housed in a 100-pin Very Thin Quad Flat Pack (VQFP) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed pad for thermal dissipation. Pinout conforms to Xilinx Spartan-3 family standard layout for VQ100 package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S50-5VQG100C, the XC3S100-5VQG100C offers headroom for future feature expansion within the same board layout, while the XC3S50-4VQG100C trades 16% clock performance for lower static power and reduced cost - both retain identical I/O structure and configuration compatibility.

Availability

XC3S50-5VQG100C is available at Aetrix Electronics and suitable for industrial PLC logic, digital video interface bridging, and low-cost motor control requiring stable component supply and long-term production continuity.

Supply support for XC3S50-5VQG100C 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 now develops adaptive computing platforms including FPGAs, MPSoCs, and AI accelerators for data center, communications, and embedded markets.

The Spartan-3 family was designed for cost-sensitive, high-volume applications requiring reconfigurable logic with integrated clock management and multi-standard I/O - targeting industrial automation, video, and communications infrastructure.

FAQ

What is the configuration method supported by XC3S50-5VQG100C?

The XC3S50-5VQG100C supports multiple configuration methods: JTAG for debugging and programming, Master Serial using external PROM, and Slave SelectMAP for processor-controlled loading. All methods use the same bitstream format and require proper power sequencing before configuration begins. The XC3S50-5VQG100C does not support internal configuration memory and relies on external storage or host initialization.

Does XC3S50-5VQG100C support differential I/O standards?

Yes, XC3S50-5VQG100C supports LVDS, RSDS, and LVPECL differential standards on dedicated I/O pairs. These are implemented using internal termination and calibrated output drivers, with timing parameters specified in the DS099 datasheet. The XC3S50-5VQG100C requires proper PCB layout (controlled impedance, length matching) to maintain signal integrity at up to 320 Mbps per lane.

What power supplies are required for XC3S50-5VQG100C operation?

XC3S50-5VQG100C requires three independent supplies: VCCINT = 1.2 V ±3% for core logic, VCCAUX = 2.5 V ±3% for auxiliary circuits including DCMs and JTAG, and VCCO = 1.2–3.3 V (per bank) for I/O signaling. Power-on sequencing must follow VCCINT → VCCAUX → VCCO, with monotonic ramp rates specified in the DS099 datasheet. The XC3S50-5VQG100C has no internal regulators and depends on external PMIC or discrete LDOs.

Can XC3S50-5VQG100C be used in automotive applications?

No, XC3S50-5VQG100C is rated for commercial temperature range (0°C to +85°C) and is not qualified to AEC-Q100 or ISO/TS 16949 standards. It lacks automotive-grade screening, extended temperature support, and fault-tolerant features required for vehicle systems. For automotive use, designers should consider Xilinx Spartan-3A or later families with industrial or automotive qualification. The XC3S50-5VQG100C remains appropriate for industrial and consumer equipment operating within its specified thermal envelope.

What is the maximum operating frequency of XC3S50-5VQG100C's Digital Clock Managers?

The XC3S50-5VQG100C's Digital Clock Managers support input frequencies from 1.0 MHz to 250 MHz and generate output frequencies up to 320 MHz. Each DCM provides fine-grained phase shift resolution (±125 ps), 50–60% duty cycle correction, and jitter attenuation below 150 ps peak-to-peak. The XC3S50-5VQG100C DCMs are fully characterized for the -5 speed grade and meet timing specifications across voltage and temperature corners.