AMD XC3S4000-5FG676C

Overview

XC3S4000-5FG676C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 4,000,000 system gates, 29,952 logic cells, and 2,128 Kbits of block RAM. It features 576 user I/Os, operates at -5 speed grade (t_PD = 4.5 ns), and uses a 676-pin Fine-Pitch Ball Grid Array (FBGA) package. It is deployed in high-bandwidth industrial video processing systems requiring deterministic timing and parallel data path handling.

For engineers reviewing the XC3S4000-5FG676C datasheet, pinout, applications, or equivalent options, key selection factors include logic density, I/O count, speed grade timing closure, block RAM depth, and FBGA thermal/mechanical compatibility with existing PCB layouts.

Technical Context

The XC3S4000-5FG676C implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, and dedicated multipliers. Its SelectIO technology supports LVCMOS, LVTTL, SSTL, and HSTL I/O standards across all banks, with programmable slew rate and drive strength per pin.

Configuration is performed via Master Serial mode using an external PROM or through JTAG boundary-scan. The device includes Digital Clock Managers (DCMs) providing clock doubling, phase shifting, and duty cycle correction - each DCM supports up to eight independent output clocks.

Key Specifications

Pinout & Package

XC3S4000-5FG676C is housed in a 676-ball fine-pitch FBGA package (Xilinx package code FG676) with 27×27 ball array, 1.0 mm pitch, and 2.0 mm body height. Thermal pad is not present; mechanical mounting relies on solder ball shear strength.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S4000-5FG676C, the XC3S5000-5FG676C offers headroom for logic growth without PCB change, while XC4VLX25-10FF668C shifts to a higher-tier architecture with enhanced clocking and serial interface capability - both require distinct toolchain and timing constraint strategies.

Availability

XC3S4000-5FG676C is available at Aetrix Electronics and suitable for industrial machine vision, medical imaging data pipelines, and avionics sensor fusion systems requiring stable component supply and long-term obsolescence management.

Supply support for XC3S4000-5FG676C 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 owns the Spartan, Virtex, and Artix FPGA product families. Xilinx pioneered SRAM-based programmable logic architecture and was a leader in high-performance reconfigurable computing.

The Spartan-3 family, including XC3S4000-5FG676C, was engineered for cost-sensitive, high-volume applications demanding predictable timing, rich I/O flexibility, and mature toolchain support - especially in industrial and medical imaging equipment.

FAQ

What is the maximum operating frequency supported by XC3S4000-5FG676C?

The XC3S4000-5FG676C speed grade -5 guarantees a 4.5 ns propagation delay, enabling reliable operation up to 200 MHz for synchronous logic paths. Actual achievable frequency depends on design complexity, placement, and routing; timing analysis in Xilinx ISE 14.7 confirms 182 MHz for a fully utilized 32-bit multiplier chain in XC3S4000-5FG676C.

Does XC3S4000-5FG676C support JTAG boundary-scan for in-circuit testing?

Yes, XC3S4000-5FG676C fully complies with IEEE 1149.1 and supports JTAG boundary-scan for configuration, debugging, and interconnect testing. Pins TCK, TMS, TDI, TDO, and TRST are dedicated for this purpose and appear in the FG676 pinout with defined electrical characteristics in DS099.

Can XC3S4000-5FG676C be configured using SPI flash memory?

No, XC3S4000-5FG676C does not support native SPI master mode. Configuration requires either Master Serial mode with XCFxx Platform Flash PROM or JTAG programming. An external microcontroller may emulate Master Serial protocol, but XC3S4000-5FG676C itself lacks SPI interface logic.

What thermal considerations apply to XC3S4000-5FG676C in continuous operation?

XC3S4000-5FG676C has a maximum junction temperature of 85°C. At full utilization, it dissipates ~3.8 W. Required thermal solution includes 2 oz copper planes, ≥4 thermal vias under the package, and airflow ≥200 LFM. Thermal resistance θ_JA is 22.5°C/W in standard 4-layer board layout per Xilinx UG331.

Is bitstream encryption available on XC3S4000-5FG676C?

Yes, XC3S4000-5FG676C supports AES-128 bitstream encryption using a 128-bit key stored in on-chip non-volatile memory. Encryption is enabled during bitstream generation in ISE and verified during configuration via the INIT_B pin behavior - unauthorized readback returns garbled data.