AMD XCS40-3BG256C

Overview

XCS40-3BG256C from AMD (formerly Xilinx) is a Spartan-XL family FPGA with 40,000 system gates, 256-pin BGA package, 3.3 V I/O voltage, and -3 speed grade (12 ns CLB propagation delay). It implements configurable logic for digital control in industrial motion controllers.

For engineers reviewing the XCS40-3BG256C datasheet, pinout, applications, or equivalent options, key selection factors include I/O count (184 user I/Os), configuration mode (JTAG/Slave Serial), internal RAM (12 kbits), and compliance with IEEE 1149.1 boundary-scan test standard.

Technical Context

The XCS40-3BG256C integrates configurable logic blocks (CLBs), input/output blocks (IOBs), and interconnect resources programmable via SRAM-based configuration bitstream. It supports multiple configuration modes including JTAG boundary-scan and Slave Serial PROM loading.

Its architecture delivers deterministic timing with guaranteed 12 ns CLB propagation delay at -3 speed grade and operates with 3.3 V core and I/O supply. The device includes dedicated carry logic for high-speed arithmetic and distributed RAM per CLB.

Key Specifications

Pinout & Package

256-ball fine-pitch BGA (17 × 17 mm, 1.27 mm pitch) with perimeter I/O arrangement and dedicated power/ground ball pattern for signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA-based digital control applications.

Compared with XCS40-3BG256C, the XCS40-4BG256C offers improved timing margin without layout change, while the XCS30-3BG256C reduces unit cost at the expense of logic headroom - both require functional verification but no PCB revision.

Availability

XCS40-3BG256C is available at Aetrix Electronics and suitable for industrial motion control, programmable relay systems, legacy avionics emulation, and automated test equipment requiring stable component supply and long-lifecycle support.

Supply support for XCS40-3BG256C 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 continues to support legacy Spartan families under the AMD Adaptive SoC and FPGA portfolio.

The Spartan-XL family was designed for cost-sensitive, high-volume digital control applications requiring predictable timing, JTAG testability, and long-term availability - especially in industrial and test equipment markets.

FAQ

What is the configuration method supported by the XCS40-3BG256C?

The XCS40-3BG256C supports JTAG boundary-scan and Slave Serial configuration modes. JTAG allows in-system programming and debugging via standard test access port signals (TCK, TMS, TDI, TDO), while Slave Serial enables bootloading from external PROM. Both methods are fully documented in the Spartan-XL Configuration User Guide, and the XCS40-3BG256C requires no external configuration controller.

Does the XCS40-3BG256C have internal configuration memory?

No, the XCS40-3BG256C uses SRAM-based configuration and does not retain its bitstream after power loss. It must be reconfigured at power-up using an external source such as JTAG programmer or serial PROM. This characteristic applies to all Spartan-XL devices, including the XCS40-3BG256C, and necessitates inclusion of configuration circuitry in system design.

What is the maximum operating frequency of the XCS40-3BG256C?

The XCS40-3BG256C has a guaranteed CLB propagation delay of 12 ns at -3 speed grade, supporting system clock frequencies up to approximately 83 MHz for logic paths crossing a single CLB. Actual maximum frequency depends on design topology, routing, and I/O timing constraints - verified per design using Xilinx Foundation or Alliance software timing analysis for the XCS40-3BG256C.

Can the XCS40-3BG256C interface directly with 5 V TTL devices?

The XCS40-3BG256C I/Os operate at 3.3 V and are not 5 V tolerant. Direct connection to 5 V TTL outputs risks damaging the device. Safe interfacing requires external level-shifting circuitry or use of 3.3 V–compatible peripherals. This limitation applies uniformly across all I/O banks of the XCS40-3BG256C and is specified in the DC Characteristics table of its datasheet.

Is the XCS40-3BG256C still in production?

The XCS40-3BG256C is discontinued by AMD/Xilinx but remains available through authorized legacy distributors and Aetrix Electronics' long-term inventory program. Aetrix maintains traceable, tested stock with full lot documentation and provides lifecycle coordination support specifically for the XCS40-3BG256C to sustain industrial and aerospace programs.