AMD XC3S1000-4FTG256C

Overview

XC3S1000-4FTG256C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 1,000,000 system gates, 21,696 logic cells, and 173 I/O pins in a 256-pin Fine-Pitch Ball Grid Array (FBGA) package. It operates at -4 speed grade (tPD = 4.5 ns), supports SelectIO™ standards up to 622 Mbps, and targets high-volume embedded control and interface bridging applications.

For engineers reviewing the XC3S1000-4FTG256C datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O voltage flexibility (1.2 V to 3.3 V), embedded block RAM (648 Kbits), DLL-based clock management, and compatibility with Xilinx ISE design tools.

Technical Context

The XC3S1000-4FTG256C implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, and dedicated carry logic for arithmetic. It integrates twelve Digital Clock Managers (DCMs) supporting phase shifting, frequency synthesis, and duty cycle correction.

It supports multi-standard I/O with programmable drive strength (2–24 mA), slew rate control, and on-chip termination (up to 50 Ω). Configuration is performed via Master Serial, Slave Serial, or JTAG modes using external PROM or processor-controlled interfaces.

Key Specifications

Pinout & Package

XC3S1000-4FTG256C 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 digital logic implementation applications.

Compared with XC3S1000-4FTG256C, the XC3S1500-4FTG256C offers headroom for feature expansion without layout changes, while the XC3S500E-4FTG256C reduces unit cost where logic utilization stays below 60%.

Availability

XC3S1000-4FTG256C is available at Aetrix Electronics and suitable for industrial motion control, video interface bridging, communications backplane aggregation, and automated test equipment requiring stable component supply over extended production lifecycles.

Supply support for XC3S1000-4FTG256C 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-3 product line for legacy industrial and aerospace applications requiring long-term supply assurance.

The Spartan-3 family was designed for cost-sensitive, high-volume embedded systems needing moderate logic density, flexible I/O, and deterministic timing - especially where ASIC development cost or lead time is prohibitive.

FAQ

What is the maximum operating frequency of the XC3S1000-4FTG256C?

The XC3S1000-4FTG256C has a -4 speed grade, guaranteeing a 4.5 ns propagation delay (tPD) for critical paths. Its maximum system clock frequency depends on design complexity but typically reaches 250 MHz for register-to-register paths in well-constrained ISE implementations. The 12 integrated DCMs support output frequencies up to 320 MHz with jitter specifications defined in DS099.

Does the XC3S1000-4FTG256C support JTAG boundary-scan testing?

Yes, the XC3S1000-4FTG256C fully complies with IEEE 1149.1 and includes dedicated TCK, TMS, TDI, and TDO pins. These enable in-system programming, debug access, and interconnect testing during board manufacturing and field maintenance. JTAG functionality remains active regardless of configuration mode.

Can the XC3S1000-4FTG256C be configured via a microcontroller?

Yes, the XC3S1000-4FTG256C supports Slave Serial configuration mode, allowing a microcontroller to stream the bitstream through the DIN pin while controlling INIT_B and PROGRAM_B. This enables field-upgradable logic and dynamic reconfiguration in systems where host processor control is required.

What I/O voltage levels does the XC3S1000-4FTG256C support?

The XC3S1000-4FTG256C supports I/O voltages from 1.2 V to 3.3 V across six independently powered banks (VCCO_0 through VCCO_5). Each bank can be set to different voltages, enabling direct interfacing with mixed-voltage peripherals such as 1.8 V sensors, 2.5 V memory, and 3.3 V UARTs without level shifters.

Is the XC3S1000-4FTG256C still in production?

XC3S1000-4FTG256C is a mature Spartan-3 device no longer in active production by AMD/Xilinx, but Aetrix Electronics maintains verified inventory and long-term supply agreements with authorized sources. Lifecycle documentation confirms availability through 2027 for qualified industrial programs.