AMD XC3S400-5FGG320C

Overview

XC3S400-5FGG320C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 400,000 system gates, 241 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 288 distributed RAM bits per CLB, supports SelectIO standards including LVCMOS, LVTTL, and SSTL, and is used in industrial control logic, digital video interface bridging, and reconfigurable data acquisition systems.

For engineers reviewing the XC3S400-5FGG320C datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O voltage flexibility, embedded block RAM capacity, and support for multi-standard I/O interfaces in cost-sensitive, high-volume embedded designs.

Technical Context

The XC3S400-5FGG320C implements a hierarchical architecture with configurable logic blocks (CLBs), distributed RAM, and 18×18-bit binary multipliers. It features eight global clock networks and supports internal configuration via Master Serial or Slave Parallel modes using external PROM or processor.

It operates at 1.2 V core voltage with 3.3 V or 2.5 V I/O supply options, includes Digital Clock Managers (DCMs) for phase-matched clock synthesis and jitter reduction, and supports boundary-scan testing per IEEE 1149.1 (JTAG).

Key Specifications

Pinout & Package

XC3S400-5FGG320C uses a 320-ball fine-pitch BGA (FGG) package with 15×15 mm footprint, 1.0 mm ball pitch, and standard thermal pad layout. Pin functions are organized into banks with independent VCCO and VREF per bank.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S400-5FGG320C, XC3S500E-4FGG320C offers higher gate count and improved DCM performance in identical packaging, while XC3S200A-4VQG100C trades logic and I/O resources for compactness and cost-enabling tiered design scalability across product families.

Availability

XC3S400-5FGG320C is available at Aetrix Electronics and suitable for industrial motion control, digital video interface bridging, and reconfigurable data acquisition requiring stable component supply and long-term production continuity.

Supply support for XC3S400-5FGG320C 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 now develops adaptive computing platforms including FPGAs, adaptive SoCs, and AI engines for data center, embedded, and edge applications.

The Spartan-3 family, including XC3S400-5FGG320C, was designed for cost-sensitive, high-volume embedded systems requiring reliable reconfigurable logic with integrated clock management and multi-standard I/O.

FAQ

What is the core voltage requirement for XC3S400-5FGG320C?

The XC3S400-5FGG320C requires a nominal 1.2 V ±3% core supply voltage (VCCINT) delivered through dedicated power pins. This voltage powers the internal logic fabric and CLBs. Deviations beyond tolerance cause timing violations or configuration failure. The XC3S400-5FGG320C does not support core voltage scaling or dynamic voltage adjustment.

Does XC3S400-5FGG320C support JTAG boundary-scan testing?

Yes, XC3S400-5FGG320C fully complies with IEEE 1149.1 (JTAG) boundary-scan standards. It includes dedicated TCK, TMS, TDI, and TDO pins, and supports INTEST, EXTEST, and SAMPLE/PRELOAD instructions. This enables board-level interconnect testing and in-system programming without requiring external test fixtures. The XC3S400-5FGG320C JTAG chain can be daisy-chained with other Xilinx devices.

How many Digital Clock Managers (DCMs) are integrated in XC3S400-5FGG320C?

The XC3S400-5FGG320C integrates four Digital Clock Managers (DCMs). Each DCM provides input clock multiplication, division, phase shifting, and duty-cycle correction. These DCMs operate independently and support clock frequencies from 12 MHz to 240 MHz. The XC3S400-5FGG320C uses these DCMs to generate multiple synchronized clocks for different functional blocks without external clock ICs.

What I/O standards are supported by XC3S400-5FGG320C?

XC3S400-5FGG320C supports 19 SelectIO standards including LVCMOS (1.2 V to 3.3 V), LVTTL, PCI, SSTL18, SSTL2, HSTL18, and GTL. I/O banks are independently configurable, allowing mixed-voltage operation. Each bank requires its own VCCO and optional VREF. The XC3S400-5FGG320C does not support differential standards like LVDS or RSDS natively without external termination.

Can XC3S400-5FGG320C be configured via a microcontroller?

Yes, XC3S400-5FGG320C supports Slave Parallel and Slave Serial configuration modes, enabling direct loading of bitstream data from a microcontroller's GPIO or UART interface. In Slave Parallel mode, the microcontroller writes configuration data to the FPGA's DATAIN pins under control of CCLK and WRITE signals. The XC3S400-5FGG320C acknowledges completion via the INIT_B and DONE pins, allowing firmware-controlled reconfiguration.