AMD XCS20-3PQ208I

Overview

XCS20-3PQ208I from AMD (formerly Xilinx) is a Spartan-2 family FPGA with 20,000 system gates, 176 user I/Os, and a 3.3V core voltage in a 208-pin PQFP package. It implements synchronous digital logic for industrial control interfaces, protocol bridging, and real-time signal conditioning.

For engineers reviewing the XCS20-3PQ208I datasheet, pinout, applications, or equivalent options, key selection criteria include I/O count, configuration mode support (Master Serial, Slave Parallel), TCK frequency limit (25 MHz), and -3 speed grade timing performance.

Technical Context

The XCS20-3PQ208I integrates configurable logic blocks (CLBs), input/output blocks (IOBs), and interconnect resources optimized for low-cost, high-volume embedded logic replacement. Its architecture supports IEEE 1149.1 JTAG boundary-scan testing and in-system programmability via serial PROM or microprocessor interface.

Configuration is performed through dedicated pins (INIT, PROGRAM, DONE) with support for Master Serial mode using external PROM or Slave Parallel mode driven by host processor. The device operates within commercial temperature range (0°C to 70°C) and meets JEDEC JESD78 Class II latch-up immunity.

Key Specifications

Pinout & Package

208-pin Plastic Quad Flat Pack (PQFP) with 0.5 mm lead pitch, 28 mm × 28 mm body size, and gull-wing leads. Thermal pad not present; no exposed die attach pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCS20-3PQ208I, the -4 speed grade offers tighter timing margins without layout change, while the XCS30 variant provides headroom for logic growth-both retain full pin and configuration compatibility for drop-in evaluation.

Availability

XCS20-3PQ208I is available at Aetrix Electronics and suitable for industrial control, test instrumentation, and medical diagnostics requiring stable component supply over multi-year production cycles.

Supply support for XCS20-3PQ208I 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 manages the Spartan FPGA product line as part of its adaptive computing portfolio.

The Spartan-2 family was designed for cost-sensitive, high-volume applications requiring reliable, reprogrammable logic with predictable timing and low power consumption.

FAQ

What is the maximum operating frequency supported by the XCS20-3PQ208I?

The XCS20-3PQ208I has a -3 speed grade, guaranteeing a maximum internal CLB clock frequency of 125 MHz under worst-case commercial temperature and voltage conditions. This value is derived from timing characterization across process corners and is documented in the Spartan-2 data sheet timing tables. Actual system-level clock rates depend on routing delays and I/O interface constraints, not the core CLB limit alone.

Does the XCS20-3PQ208I support in-system programming?

Yes, the XCS20-3PQ208I supports in-system programming via its Slave Parallel configuration mode, allowing a host microcontroller to write configuration bitstream directly to the device. It also supports JTAG-based programming using standard boundary-scan tools. The XCS20-3PQ208I does not support partial reconfiguration or runtime bitstream updates without full reinitialization.

Can the XCS20-3PQ208I operate with a 2.5V core supply?

No, the XCS20-3PQ208I requires a nominal 3.3V core supply with tolerance of ±0.3V. It is not compatible with 2.5V or lower core voltages. Using an incorrect supply voltage will prevent configuration or cause functional failure. The XCS20-3PQ208I I/O banks are also 3.3V-tolerant and lack internal level shifters for mixed-voltage operation.

Is the XCS20-3PQ208I pin-compatible with other Spartan-2 devices in PQFP-208 packages?

Yes, all Spartan-2 devices in the PQFP-208 package-including XCS10, XCS20, XCS30, and XCS40 variants-share identical pinouts and power/ground assignments. This allows direct substitution based on gate count and speed grade without PCB redesign. The XCS20-3PQ208I retains full compatibility with XCS30-3PQ208I and XCS40-3PQ208I at the board level.

What configuration memory options are supported by the XCS20-3PQ208I?

The XCS20-3PQ208I supports Master Serial configuration using industry-standard 4-Mbit or larger serial PROMs (e.g., Xilinx XC18V04), and Slave Parallel configuration driven by an external microprocessor or controller. It does not support JTAG-only configuration without external PROM or host interface, nor does it embed configuration memory internally.