AMD XC17S40PD8C

Overview

XC17S40PD8C from AMD is a serial configuration PROM designed for Xilinx Spartan-3 FPGAs, providing 4 Mbit of non-volatile storage in an 8-pin PDIP package with 5 V supply voltage, 10 MHz read speed, and industrial temperature range (–40°C to +85°C) for FPGA bitstream loading in embedded control systems.

For engineers reviewing the XC17S40PD8C datasheet, pinout, applications, or equivalent options, key selection factors include 5 V operation compatibility, PDIP-8 mechanical fit for legacy prototyping, serial CCLK-synchronized read timing, and guaranteed data retention over 20 years at 55°C.

Technical Context

This PROM uses CMOS technology with TTL-compatible inputs and outputs, supporting standard Xilinx JTAG and SelectMAP configuration modes. It interfaces directly with Spartan-3 FPGAs via dedicated DOUT, CCLK, and PROGRAM_B signals, requiring no external logic for power-on initialization.

Configuration occurs on power-up or FPGA reset, with automatic address incrementing and internal self-timed write cycles during programming. The device lacks internal voltage regulation and relies on stable 5 V ±10% supply for reliable read/write operation.

Key Specifications

Pinout & Package

8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and 0.1-inch pin pitch. RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCF04SVO20C and AT17LV40-10PU, the XC17S40PD8C uniquely supports direct integration into 5 V Spartan-3 systems without level shifting, retains PDIP-8 compatibility for field upgrades, and guarantees industrial temperature operation without derating.

Availability

XC17S40PD8C is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based motor controllers, and legacy test equipment requiring stable component supply and long-lifecycle support.

Supply support for XC17S40PD8C 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 legacy Xilinx configuration PROM product lines including the XC17S series.

The XC17S family was originally developed by Xilinx to provide cost-optimized, pin-compatible configuration memory for Spartan FPGA platforms, targeting industrial and embedded applications with long product lifecycles.

FAQ

Is XC17S40PD8C compatible with Spartan-3E FPGAs?

No, XC17S40PD8C is not compatible with Spartan-3E FPGAs. It is specifically designed for original Spartan-3 devices such as XC3S50 through XC3S1000. Spartan-3E requires different configuration bitstream format and timing, and uses XCFxx PROMs. Using XC17S40PD8C with Spartan-3E will result in failed configuration or undefined behavior.

What is the maximum CCLK frequency supported by XC17S40PD8C?

The XC17S40PD8C supports a maximum CCLK frequency of 10 MHz. This value is specified under standard operating conditions (5 V, 25°C) and defines the upper limit for FPGA configuration clock rate. Exceeding 10 MHz may cause read errors or incomplete bitstream loading in the target Spartan-3 FPGA.

Does XC17S40PD8C require external pull-up resistors on its control pins?

XC17S40PD8C does not require external pull-up resistors on PROGRAM_B or CCLK. PROGRAM_B has an internal weak pull-up; CCLK is driven actively by the FPGA. However, DOUT should be terminated with a 50 Ω resistor to VCC in high-noise environments to reduce signal reflections during fast configuration sequences.

Can XC17S40PD8C be reprogrammed in-system?

No, XC17S40PD8C is a one-time programmable (OTP) PROM. It cannot be erased or reprogrammed after initial programming. Programming requires a dedicated Xilinx-compatible PROM programmer such as the Xilinx Parallel Cable III or third-party programmers supporting XC17S series command sets.

What is the pin compatibility status between XC17S40PD8C and XC17S20PD8C?

XC17S40PD8C and XC17S20PD8C share identical pinout, package (PDIP-8), and electrical interface. They differ only in memory capacity (4 Mbit vs. 2 Mbit) and internal array size. This allows direct substitution in designs where bitstream size permits, without PCB or firmware changes.