AMD XC3S50A-4TQ144C

Overview

XC3S50A-4TQ144C from AMD (formerly Xilinx) is a Spartan-3A FPGA with 50,000 system gates, 1,728 logic cells, and 144-pin TQFP package. It operates at -4 speed grade (1.14 ns CLB delay), supports 3.3 V I/O, and includes embedded block RAM and digital clock managers (DCMs). It is used in industrial control logic and low-cost communication interface bridging.

For engineers reviewing the XC3S50A-4TQ144C datasheet, pinout, applications, or equivalent options, key selection factors include logic density, DCM availability, I/O voltage compatibility, and TQFP thermal profile for reflow-suitable PCBs.

Technical Context

The XC3S50A-4TQ144C implements a configurable logic fabric based on 4-input LUTs and flip-flops, with dedicated carry logic for arithmetic. It integrates two Digital Clock Managers (DCMs) supporting phase shifting, frequency synthesis, and duty cycle correction.

It features 176 Kbits of total block RAM distributed across 20 blocks, each 18 Kbits, and supports SelectIO standards including LVCMOS, LVTTL, and PCI up to 33 MHz. Configuration is performed via serial PROM or JTAG boundary scan.

Key Specifications

Pinout & Package

XC3S50A-4TQ144C uses a 144-pin Thin Quad Flat Pack (TQFP) with 0.5 mm pitch, 20 mm × 20 mm body, and exposed thermal pad. Package meets JEDEC MS-026 standard and supports lead-free reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA logic and clock management applications.

Compared with XC3S50A-4TQ144C, the XC3S100A-4TQ144C offers headroom for future feature expansion within identical board space, while XC3S50-4TQ144C trades verified industrial reliability for older architecture compatibility.

Availability

XC3S50A-4TQ144C is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test equipment requiring stable component supply across multi-year production cycles.

Supply support for XC3S50A-4TQ144C 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, ACAPs, and software tools for hardware-accelerated systems.

The Spartan-3A family was designed for cost-sensitive, high-volume applications requiring reliable logic density, integrated clock management, and flexible I/O - targeting industrial control, consumer video, and communications infrastructure.

FAQ

What is the maximum operating frequency of the XC3S50A-4TQ144C?

The XC3S50A-4TQ144C has a -4 speed grade specifying a 1.14 ns CLB propagation delay under worst-case commercial conditions. Its maximum system clock frequency depends on design topology but typically reaches 280 MHz for simple register-to-register paths. The DCMs support input frequencies up to 200 MHz and generate stable outputs up to 320 MHz.

Does the XC3S50A-4TQ144C support JTAG programming?

Yes, the XC3S50A-4TQ144C supports IEEE 1149.1 JTAG boundary scan for configuration, debugging, and verification. Pins TCK, TMS, TDI, and TDO are dedicated to JTAG and can be used alongside or instead of master serial PROM configuration. JTAG mode requires no external configuration memory.

What power supplies are required for the XC3S50A-4TQ144C?

The XC3S50A-4TQ144C requires three distinct supplies: 1.2 V for core logic (VCCINT), 3.3 V for I/O banks (VCCO), and 1.2 V for auxiliary circuitry including DCMs and configuration logic (VCCAUX). Each supply must be independently decoupled with low-ESR capacitors near respective power pins.

Can the XC3S50A-4TQ144C replace the XC3S50-4TQ144C in an existing design?

Yes, the XC3S50A-4TQ144C is backward compatible with the XC3S50-4TQ144C and uses identical pinout, package, and configuration interface. However, it adds enhanced I/O drive strength, lower DCM jitter, and extended temperature qualification - making XC3S50A-4TQ144C suitable for new designs requiring higher reliability.

How much block RAM does the XC3S50A-4TQ144C provide?

The XC3S50A-4TQ144C provides 176 Kbits of total block RAM, organized as twenty 9 Kb blocks. Each block supports true dual-port operation, byte-wide write enables, and asynchronous read capability - enabling efficient implementation of FIFOs, buffers, or small lookup tables without external memory.