AMD XC3S250E-4FTG256I

Overview

XC3S250E-4FTG256I from AMD (formerly Xilinx) is a Spartan-3E FPGA with 250,000 system gates, 5,928 logic cells, 216 Kbits of block RAM, and operates at -4 speed grade (tPD = 4.5 ns). It features 173 user I/Os in a 256-pin Fine-Pitch Ball Grid Array (FBGA) package and is used in industrial control logic, digital video interface bridging, and low-cost embedded reconfigurable systems.

For engineers reviewing the XC3S250E-4FTG256I datasheet, pinout, applications, or equivalent options, key selection considerations include I/O count, block RAM depth, speed grade timing margins, differential signaling support (LVDS), and JTAG configuration interface compatibility.

Technical Context

The XC3S250E-4FTG256I implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, dedicated multipliers, and digital clock managers (DCMs) supporting input jitter tolerance ≤100 ps and output duty cycle correction. It supports SelectIO standards including LVCMOS, LVTTL, PCI, and LVDS for bidirectional I/O.

Configuration is performed via Master Serial mode using external PROM or through JTAG boundary-scan, with internal startup sequence controlling INIT_B, DONE, and CCLK timing. The device includes four DCMs enabling phase shifting, frequency synthesis, and clock doubling up to 320 MHz.

Key Specifications

Pinout & Package

XC3S250E-4FTG256I is housed in a 256-ball fine-pitch BGA (FTG) package with 1.0 mm ball pitch, 17 mm × 17 mm body size, and thermal pad exposed on underside for enhanced heat dissipation in industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S250E-4FTG256I, the XC3S500E-4FTG256I offers headroom within the same footprint, while the XC6SLX16-2CSG324C delivers architectural improvements at the cost of layout change and toolchain migration.

Availability

XC3S250E-4FTG256I is available at Aetrix Electronics and suitable for industrial automation, digital video processing, and motor control applications requiring stable component supply across extended product lifecycles.

Supply support for XC3S250E-4FTG256I 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, ACAPs, and software tools for heterogeneous compute acceleration.

The Spartan-3E family was designed for cost-sensitive, high-volume embedded applications requiring reconfigurable logic with predictable timing and industrial-grade reliability.

FAQ

What is the maximum operating frequency supported by the XC3S250E-4FTG256I?

The XC3S250E-4FTG256I supports internal clock frequencies up to 320 MHz when using Digital Clock Managers (DCMs) for frequency synthesis. Its -4 speed grade guarantees 4.5 ns CLB propagation delay, enabling reliable operation at 200+ MHz system clocks in typical industrial designs. Actual achievable frequency depends on routing congestion and logic depth per critical path.

Does the XC3S250E-4FTG256I support LVDS signaling?

Yes, the XC3S250E-4FTG256I supports LVDS input and output standards through its SelectIO technology. Each I/O bank can be configured for LVDS with proper termination and VCCO = 2.5 V. Differential pairs must be assigned to adjacent pins within the same bank, and internal differential termination is not provided - external 100 Ω resistors are required.

How is the XC3S250E-4FTG256I configured after power-up?

The XC3S250E-4FTG256I supports multiple configuration modes. In Master Serial mode, it loads configuration data from an external SPI PROM upon power-up. It also supports JTAG boundary-scan configuration for development and in-system programming. The DONE pin goes high once configuration completes successfully, and INIT_B signals errors during the process.

Can the XC3S250E-4FTG256I operate in industrial temperature range?

Yes, the XC3S250E-4FTG256I with the 'I' suffix is rated for industrial temperature operation from –40 °C to +100 °C junction temperature. This rating applies under specified voltage and loading conditions, and thermal management must ensure the die temperature remains within limits using appropriate PCB copper area and airflow.

What debug capabilities does the XC3S250E-4FTG256I provide?

The XC3S250E-4FTG256I supports IEEE 1149.1 JTAG boundary-scan for interconnect testing and in-circuit programming. While it lacks embedded logic analyzers like later families, third-party tools such as ChipScope Pro (with compatible license and download cable) can be used to insert ILA cores into the XC3S250E-4FTG256I design for real-time signal capture.