XA3S50-4PQG208I
XA3S50-4PQG208I - 50K-Gate Automotive Spartan-3A FPGA | Xilinx
The Xilinx XA3S50-4PQG208I is an automotive Spartan-3A field-programmable gate array with 50,000 system gates, 1,728 logic elements, 124 user I/O, and 73,728 RAM bits in a 208-pin PQFP package. It operates from a 1.2 V core supply with 3.3 V I/O, uses 90 nm FPGA technology, and supports data rates up to 622 Mb/s per I/O.
An FPGA is a programmable digital-logic device whose lookup tables, flip-flops, routing, block RAM, and I/O blocks are configured after manufacture. Within the semiconductor hierarchy, the XA3S50-4PQG208I is an FPGA and programmable-logic device. It sits between fixed-function logic and larger application-specific programmable arrays, allowing automotive and industrial designs to implement parallel processing, control, communication, and interface logic on one device.
The device provides 192 configurable logic blocks, 124 user I/O, 73,728 RAM bits, and support for 17 single-ended and seven differential I/O standards, including LVDS. Digitally controlled termination supports signal-integrity control on suitable interfaces. The -4 speed designation identifies the device performance grade, while the I suffix identifies the supplied industrial-temperature configuration for demanding automotive and embedded environments.
The Spartan-3A XA architecture combines programmable logic resources with automotive-oriented product construction. A 90 nm process supports a compact, cost-sensitive implementation, while the 208-pin PQFP exposes more I/O than smaller FPGA packages. The 1.2 V core and 3.3 V I/O arrangement separates the low-voltage internal logic supply from the higher-voltage external interface supply, allowing I/O standards to be selected according to board-level requirements.
Typical uses include automotive body and chassis control modules, sensor aggregation, actuator control, gateway and communication logic, industrial automation controllers, and low-cost embedded signal-processing systems. The 124 I/O make the device useful for parallel sensor, control, communications, and debug interfaces, while 73,728 RAM bits support buffering, packet handling, and stateful control functions.
Designers should verify the complete PQFP-208 footprint, pin assignments, supported I/O standards, configuration interface, clocking, power sequencing, and decoupling against the manufacturer datasheet. Because automotive qualification and deployment depend on the complete product qualification record, engineers must also validate the applicable certification evidence for their specific production program.
This page combines the verified device specifications with practical selection guidance, sourcing context, package limitations, and clearly qualified replacement analysis. It distinguishes confirmed pin-compatible same-family options from unsupported cross-brand substitutions, helping engineers avoid assuming that a shared package alone guarantees a drop-in replacement.
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