AMD XC3S400-4TQ144I

Overview

XC3S400-4TQ144I from AMD (formerly Xilinx) is a Spartan-3 FPGA with 400,000 system gates, 8,064 logic cells, and 216 Kbits of block RAM. It operates at -4 speed grade (tPD = 4.5 ns), uses 1.2 V core voltage, and is packaged in a 144-pin TQFP. It targets cost-sensitive embedded control and interface bridging applications.

For engineers reviewing the XC3S400-4TQ144I datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O count (108 user I/Os), LVCMOS25/LVCMOS33 I/O support, and availability of dedicated multipliers and DLLs for timing control.

Technical Context

The XC3S400-4TQ144I implements a configurable logic fabric based on 4-input LUTs and flip-flops, with eight digital clock managers (DCMs) supporting phase shifting, frequency synthesis, and duty cycle correction. It includes 24 18×18-bit multipliers and supports SelectIO standards including LVCMOS, LVTTL, PCI, and SSTL.

Configuration is performed via Master Serial mode using external PROM or JTAG boundary-scan. The device supports partial reconfiguration and features internal 1.2 V voltage regulation with external 2.5 V/3.3 V I/O supply rails.

Key Specifications

Pinout & Package

XC3S400-4TQ144I is housed in a 144-pin Thin Quad Flat Package (TQFP) with 0.5 mm pitch, 20 mm × 20 mm body size, and exposed thermal pad (non-electrical). The package supports JEDEC-standard reflow profiles and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S400-4TQ144I, the XC3S500E-4TQ144C offers more logic and memory but sacrifices guaranteed industrial timing stability, while the XC3S200A-4TQ144I reduces cost and power at the expense of scalability and advanced clocking capability.

Availability

XC3S400-4TQ144I is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for XC3S400-4TQ144I 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 and markets adaptive computing platforms including FPGAs, adaptive SoCs, and AI engines.

The Spartan-3 family was originally designed by Xilinx for cost-optimized, high-volume embedded applications requiring predictable timing, low power, and broad I/O flexibility - especially in industrial and automotive control systems.

FAQ

What is the operating temperature range for XC3S400-4TQ144I?

The XC3S400-4TQ144I is rated for industrial temperature operation from –40°C to +100°C junction temperature. This specification ensures reliable functionality in harsh environments such as factory floors and vehicle under-hood locations. The 'I' suffix explicitly denotes industrial grade, distinguishing it from commercial-grade variants. Thermal design must account for power dissipation under worst-case logic utilization and ambient conditions.

Does XC3S400-4TQ144I support JTAG programming and debugging?

Yes, XC3S400-4TQ144I fully supports IEEE 1149.1 JTAG boundary-scan for programming, configuration verification, and in-system debugging. Pins T14 (TMS), R14 (TCK), P14 (TDI), and N14 (TDO) form the dedicated JTAG port. This enables seamless integration with Xilinx iMPACT and Vivado tools for bitstream loading and hardware validation without requiring external configuration PROMs.

How many digital clock managers (DCMs) does XC3S400-4TQ144I include?

XC3S400-4TQ144I integrates eight Digital Clock Managers (DCMs), each capable of input clock multiplication, division, phase shifting, and duty cycle correction. These DCMs operate independently and support clock frequencies up to 320 MHz. Their presence eliminates the need for external clock synthesis ICs in timing-critical applications such as video synchronization and high-speed data capture.

Can XC3S400-4TQ144I be used with 3.3 V I/O standards?

Yes, XC3S400-4TQ144I supports 3.3 V I/O standards including LVCMOS33 and LVTTL across its 108 user I/O pins. Each of the eight I/O banks can be independently configured with VCCO = 3.3 V, allowing direct connection to legacy microcontrollers, ADCs, and communication transceivers. Proper decoupling and bank-specific VCCO supply routing are required per Xilinx UG331 guidelines.

Is bitstream encryption supported on XC3S400-4TQ144I?

XC3S400-4TQ144I supports optional AES-128 bitstream encryption during configuration to protect intellectual property. Encryption is enabled via bitstream generation settings in Xilinx ISE software and requires an external 256-bit key stored in on-chip eFUSE or external PROM. This feature prevents unauthorized readback and cloning of the programmed logic design in deployed systems.