AMD XC3S50A-4VQ100C

Overview

XC3S50A-4VQ100C from AMD (formerly Xilinx) is a Spartan-3A FPGA with 50,000 system gates, 176 logic cells, 128 KB of total block RAM, and configured for -4 speed grade in a 100-pin VQFP package. It operates at 1.2 V core voltage and supports LVCMOS25/LVCMOS33 I/O standards, commonly used in industrial control logic and low-cost embedded interface bridging.

For engineers reviewing the XC3S50A-4VQ100C datasheet, pinout, applications, or equivalent options, key selection factors include logic density, I/O voltage flexibility, configuration mode support (Master Serial, Slave Parallel), and availability of dedicated DSP slices for basic arithmetic acceleration.

Technical Context

The XC3S50A-4VQ100C implements a fully SRAM-based configurable logic architecture with distributed RAM, shift registers, and carry logic per CLB. It integrates eight global clock buffers and supports up to four user-defined clock inputs.

Configuration is performed via external SPI PROM (Master Serial mode) or parallel data bus (Slave Parallel mode), with JTAG boundary-scan support for testing and programming. The device includes internal oscillator for startup timing and failsafe configuration monitoring.

Key Specifications

Pinout & Package

VQ100 (100-pin Very Thin Quad Flat Pack) with 0.5 mm pitch, body size 14 × 14 mm, and exposed thermal pad. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S100A-4VQ100C and XC6SLX9-2TQG144C, the XC3S50A-4VQ100C offers optimal balance of cost, power, and logic resources for entry-level reconfigurable control tasks where full Spartan-6 features are unnecessary.

Availability

XC3S50A-4VQ100C is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and avionics subsystems requiring stable component supply over extended production lifecycles.

Supply support for XC3S50A-4VQ100C 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 continues development and support of the Spartan FPGA family for cost-sensitive, low-power embedded applications.

The Spartan-3A product line was designed specifically for high-volume, non-volatile configuration-reliant systems requiring predictable timing and robust I/O flexibility in space-constrained industrial enclosures.

FAQ

What configuration modes does the XC3S50A-4VQ100C support?

The XC3S50A-4VQ100C supports Master Serial (via external SPI PROM), Slave Parallel (with host processor write access), and JTAG programming modes. It also includes an internal oscillator for startup timing and failsafe CRC checking during configuration loading. These modes allow flexible integration into both standalone and host-controlled systems without requiring external clock sources during boot.

Does the XC3S50A-4VQ100C include dedicated hardware multipliers?

Yes, the XC3S50A-4VQ100C contains four 18 × 18-bit signed/unsigned multiplier blocks. These operate independently of general logic resources and support pipelined operation at up to 250 MHz. They are used in the XC3S50A-4VQ100C for FIR filtering, PID loop computation, and arithmetic-intensive control algorithms without consuming CLBs.

What I/O voltage levels are supported by the XC3S50A-4VQ100C?

The XC3S50A-4VQ100C supports per-bank I/O voltages of 1.8 V, 2.5 V, and 3.3 V through dedicated VCCO pins. This allows mixed-voltage interfacing-for example, connecting to both 3.3 V microcontrollers and 1.8 V ADCs-without level-shifting components. All banks are independently configurable in the XC3S50A-4VQ100C bitstream.

Is the XC3S50A-4VQ100C pin-compatible with other Spartan-3A devices in VQ100 packaging?

Yes, the XC3S50A-4VQ100C shares identical pinout and package dimensions with other Spartan-3A VQ100 variants including XC3S100A-4VQ100C and XC3S200A-4VQ100C. Power, ground, configuration, and JTAG pins are fixed across the family, enabling scalable logic density upgrades without PCB redesign.

What is the maximum operating junction temperature for the XC3S50A-4VQ100C?

The XC3S50A-4VQ100C is rated for a maximum junction temperature of +85 °C under continuous operation. Thermal design must ensure adequate heat dissipation via PCB copper pour and optional heatsink attachment to the exposed thermal pad. Derating applies above ambient temperatures of +70 °C per Xilinx DS312 specification.