AMD XC17S40XLSO20I

Overview

XC17S40XLSO20I from AMD (formerly Xilinx) is a serial configuration PROM designed to store and load bitstream data for Spartan-XL FPGAs. It provides 4 Mbit storage capacity, operates at 5.0 V supply voltage, supports -40°C to +85°C industrial temperature range, and uses a 20-pin SOIC package. It is used in FPGA-based industrial control systems requiring reliable, non-volatile configuration memory.

For engineers reviewing the XC17S40XLSO20I datasheet, pinout, applications, or equivalent options, key selection criteria include configuration voltage compatibility, bitstream storage density, industrial temperature rating, SOIC-20 footprint constraints, and FPGA family-specific programming protocol support.

Technical Context

This PROM implements a synchronous serial interface compatible with Xilinx Spartan-XL FPGA configuration protocols. It features internal address counters, automatic power-up initialization, and a dedicated PROGRAM pin for reprogramming control. Data is accessed via SI (serial input), SO (serial output), and CLK (clock) signals under CS# enable.

It supports both master and slave configuration modes, includes built-in write-protection logic, and requires no external timing components for standard FPGA boot loading. The device lacks on-chip oscillator or voltage regulation - external 5.0 V supply and clean clock source are mandatory.

Key Specifications

Pinout & Package

XC17S40XLSO20I is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and standard gull-wing leads. Pin spacing is 0.050 inch (1.27 mm), and lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA configuration memory applications.

Compared with XC17S40XLSO20I, XC17S40XLPC20I offers identical functionality in through-hole form for manual assembly or legacy systems, while XC17S30XLSO20I provides a lower-density drop-in alternative for smaller Spartan-XL devices - neither replaces XC17S40XLSO20I in full-capacity applications without bitstream validation.

Availability

XC17S40XLSO20I is available at Aetrix Electronics and suitable for industrial control systems, FPGA-based motor drives, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for XC17S40XLSO20I 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 owns the Spartan-XL FPGA and associated configuration PROM product lines. Xilinx originally developed these devices for cost-sensitive, high-reliability embedded logic applications.

XC17S40XLSO20I belongs to the XC17SxxXL series of serial PROMs, engineered specifically to provide robust, single-supply configuration storage for Spartan-XL FPGAs in industrial and automotive-adjacent environments.

FAQ

What is the primary function of the XC17S40XLSO20I in an FPGA system?

The XC17S40XLSO20I serves as a non-volatile configuration memory that stores and delivers the bitstream to Spartan-XL FPGAs during power-up. It initializes the FPGA logic fabric without host processor intervention. The XC17S40XLSO20I uses a synchronous serial interface compatible with Xilinx's dedicated configuration controller architecture and supports automatic loading upon VCC stabilization.

Does the XC17S40XLSO20I support in-system programming?

Yes, the XC17S40XLSO20I supports in-system programming via its PROGRAM# pin, which places the device into write mode when asserted low. Programming requires a compatible Xilinx configuration controller or third-party programmer adhering to the XC17SxxXL serial protocol. The XC17S40XLSO20I does not support JTAG-based programming - it relies solely on the SI/CLK/CS#/PROGRAM# interface.

Can the XC17S40XLSO20I be used with newer Xilinx FPGA families like Spartan-3 or Artix-7?

No, the XC17S40XLSO20I is specifically designed for Spartan-XL FPGAs and is not compatible with Spartan-3, Spartan-6, or Artix-7 families. These newer families use different configuration protocols, voltage levels (e.g., 3.3 V or 1.2 V), and bitstream formats. Using XC17S40XLSO20I with non-Spartan-XL devices will result in failed configuration or hardware damage due to voltage mismatch.

What is the maximum clock frequency supported by the XC17S40XLSO20I during configuration?

The XC17S40XLSO20I supports a maximum CCLK frequency of 25 MHz, corresponding to a minimum access time of 25 ns. This timing aligns with Spartan-XL FPGA configuration specifications and ensures reliable bitstream transfer. Exceeding 25 MHz may cause read errors or incomplete FPGA initialization. The XC17S40XLSO20I does not include internal clock generation - the clock must be supplied externally by the FPGA or controller.

Is the XC17S40XLSO20I RoHS compliant?

The XC17S40XLSO20I is not RoHS compliant. It contains lead in the solder terminations and falls under the RoHS exemption for high-melting-temperature solders (Annex III, 7a). Devices marked with suffix 'I' denote industrial temperature grade and legacy Pb-based packaging. For RoHS-compliant alternatives, consult AMD's current-generation configuration solutions such as the Platform Flash XL series.