XC3S400-4TQ144I
XC3S400-4TQ144I - 400K Gate Industrial Spartan-3 FPGA | AMD
AMD XC3S400-4TQ144I is a Spartan-3 field-programmable gate array with 400,000 system gates, 8,064 logic cells, 294,912 bits of embedded RAM, and 97 user I/Os in a 144-pin TQFP package. It operates from a 1.2 V core supply and is manufactured using a 90 nm process. The -4 suffix identifies one of the Spartan-3 performance grades, while the I suffix identifies the industrial-temperature ordering option. The TQFP-144 package provides a surface-mount form factor for systems requiring moderate logic density, dedicated block RAM, and programmable digital interfaces without the cost or complexity of a larger FPGA.
A field-programmable gate array is a semiconductor whose digital logic, memory, and I/O behavior are configured after fabrication. In the product hierarchy, an FPGA sits above programmable logic devices and provides parallel combinational logic, sequential logic, block RAM, programmable I/O, and clocking resources. The Spartan-3 architecture is intended for cost-sensitive embedded applications in which designers need configurable hardware without developing a custom ASIC.
Verified product data identifies 400,000 system gates, 8,064 logic cells, 294,912 RAM bits, and 97 user I/Os for XC3S400-4TQ144I. The listed maximum operating frequency is 630 MHz, and the device uses 1.2 V core technology. These resources make it suitable for control logic, communications interfaces, industrial automation, test equipment, embedded signal processing, and general-purpose programmable system functions. The 144-pin package balances external connectivity against board-space requirements.
The -4 performance designation makes this device appropriate for designs that prioritize cost and power efficiency over the fastest available Spartan-3 grade. Its 8,064 logic cells and block RAM can support parallel datapaths, state machines, protocol handling, and control functions. Exact clock-rate, I/O-standard, and timing-budget conclusions should be based on the manufacturer datasheet and the selected I/O implementation rather than inferred solely from the maximum frequency listed by a distributor.
Typical applications include industrial controller logic, data-acquisition front ends, communications bridges, embedded test systems, and compact control platforms. In these systems, the FPGA can implement parallel interfaces and state machines while offloading deterministic tasks from a microcontroller. The 97 available user I/Os are particularly useful for legacy parallel buses, control signals, status indicators, and external memory or peripheral connections.
Designers should verify the exact bank supply voltages, supported I/O standards, configuration method, pinout, and timing constraints in the manufacturer datasheet before layout release. The TQFP package also requires attention to thermal dissipation and lead co-planarity. Configuration storage, clocking, decoupling, and JTAG access must be planned so that the device can be programmed and debugged in production without board rework.
This page combines verified distributor specifications, official-product search results, same-family replacement options, package-level comparison data, and practical design guidance. It distinguishes confirmed parameters from unavailable details instead of filling gaps with assumed values, helping engineers select, compare, source, and implement the XC3S400-4TQ144I with greater confidence.
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