AMD XC3S400A-5FGG320C

Overview

XC3S400A-5FGG320C from AMD (formerly Xilinx) is a Spartan-3A FPGA with 400,000 system gates, 216 I/O pins, and a 5 ns logic delay grade in a 320-pin Fine-Pitch Ball Grid Array (FBGA) package. It integrates up to 24 multipliers, 1728 RAM bits per block, and supports LVCMOS/LVTTL I/O standards for embedded control and digital logic acceleration.

For engineers reviewing the XC3S400A-5FGG320C datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O count, speed grade, embedded RAM capacity, and supported I/O standards for industrial interface bridging and reconfigurable controller design.

Technical Context

The XC3S400A-5FGG320C implements a fully SRAM-based configurable logic architecture with dedicated carry chains and distributed RAM. It features eight global clock networks, four Digital Clock Managers (DCMs), and supports configuration via Master Serial, Slave Serial, or JTAG modes.

It operates at 1.2 V core voltage with 3.3 V or 2.5 V I/O supply options and meets IEEE 1149.1 JTAG boundary-scan compliance. The device targets cost-sensitive, high-volume applications requiring deterministic timing and low static power consumption.

Key Specifications

Pinout & Package

XC3S400A-5FGG320C is housed in a 320-pin Fine-Pitch Ball Grid Array (FBGA) package with 21 mm × 21 mm body size and 0.8 mm ball pitch. Thermal pad on underside requires solder paste stencil design per Xilinx UG380.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S500E-5FGG320C and XC6SLX45-3CSG324C, the XC3S400A-5FGG320C offers optimal balance of logic capacity, I/O count, and legacy toolchain support for cost-constrained industrial control upgrades where pin compatibility and minimal BOM change are critical.

Availability

XC3S400A-5FGG320C is available at Aetrix Electronics and suitable for industrial PLC interface modules, automotive diagnostic gateways, and medical imaging preprocessor units requiring stable component supply and long-term lifecycle assurance.

Supply support for XC3S400A-5FGG320C 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 the Spartan-3A product family for legacy industrial and aerospace applications.

The Spartan-3A FPGA family was designed for cost-sensitive, high-volume applications requiring reconfigurable logic with predictable timing, low static power, and robust configuration security.

FAQ

What is the maximum operating frequency of the XC3S400A-5FGG320C?

The XC3S400A-5FGG320C has a -5 speed grade, guaranteeing a 5 ns CLB propagation delay. Its maximum system clock frequency depends on design topology but typically reaches 210 MHz for fully pipelined logic paths. Actual achievable frequency must be verified using Xilinx ISE timing analysis tools with the specific implemented netlist and constraints applied to XC3S400A-5FGG320C.

Does the XC3S400A-5FGG320C support JTAG boundary-scan testing?

Yes, the XC3S400A-5FGG320C fully complies with IEEE 1149.1 JTAG boundary-scan standard. It supports TAP controller access for device identification, configuration verification, and interconnect testing. This capability is enabled by default and does not require special configuration bits in the XC3S400A-5FGG320C bitstream.

Can the XC3S400A-5FGG320C be configured using an external SPI PROM?

Yes, the XC3S400A-5FGG320C supports Master Serial configuration mode, allowing direct boot from industry-standard 4-Mbit or 8-Mbit SPI PROMs such as XCF04S or XCF08S. Configuration occurs automatically on power-up when PROGRAM_B is asserted, and the XC3S400A-5FGG320C drives the PROM's serial clock and data lines.

What I/O standards are supported by the XC3S400A-5FGG320C?

The XC3S400A-5FGG320C supports LVCMOS 1.2/1.5/1.8/2.5/3.3 V, LVTTL, PCI, and SSTL18 I/O standards across its 216 user I/O pins. Each I/O bank is independently configurable for voltage level and drive strength, enabling mixed-signaling interfaces within a single XC3S400A-5FGG320C device.

Is bitstream encryption available for the XC3S400A-5FGG320C?

Yes, the XC3S400A-5FGG320C supports optional AES-128 bitstream encryption using a user-provided 128-bit key. When enabled, the encrypted bitstream can only be loaded into the target XC3S400A-5FGG320C device, preventing unauthorized duplication or reverse engineering of the programmed logic design.