AMD XC17256EPDG8C

Overview

XC17256EPDG8C from Xilinx is a 256-kbit serial PROM designed for configuration storage of Spartan and Virtex FPGAs. It features 5V operation, 10 MHz maximum clock frequency, 200 ns access time, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile configuration memory in FPGA-based embedded control and communications systems.

For engineers reviewing the XC17256EPDG8C datasheet, pinout, applications, or equivalent options, key selection criteria include voltage compatibility with legacy 5V FPGA configuration interfaces, guaranteed 200 ns read timing under worst-case industrial conditions, JEDEC-standard PDIP-8 package footprint, and Xilinx's documented FPGA configuration sequence support.

Technical Context

The XC17256EPDG8C implements a synchronous serial interface compatible with Xilinx FPGA master-mode configuration controllers. It uses standard SPI-like command protocol (including READ, FAST_READ, and STATUS) but is not SPI-compliant per JEDEC JESD216. Its internal architecture includes a single 256-kbit mask-programmed or one-time-programmable (OTP) memory array organized as 32K × 8 bits.

Timing is strictly defined for 5V VCC operation only; no 3.3V or mixed-voltage operation is supported. The device lacks write-protection pins or hardware write-disable logic - programming occurs only during factory OTP fuse blowing, not in-system.

Key Specifications

Pinout & Package

XC17256EPDG8C is housed in an 8-pin plastic dual in-line package (PDIP) with 0.300-inch body width and 0.100-inch lead pitch. The package is RoHS-compliant, Pb-free, and moisture-sensitive level 1 (MSL-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC17256EPDG8C, the XC17S256EPC8C offers identical functionality in a smaller SOIC package but sacrifices through-hole compatibility, while the AT27C256R-70PU enables field updates at the cost of long-term reliability assurance and additional programming infrastructure.

Availability

XC17256EPDG8C is available at Aetrix Electronics and suitable for industrial automation, legacy telecom hardware, avionics subsystems, and FPGA-based test equipment requiring stable component supply across multi-year production cycles.

Supply support for XC17256EPDG8C 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

Xilinx (now part of AMD) is a fabless semiconductor company specializing in programmable logic devices, including FPGAs, SoCs, and configuration PROMs for high-reliability digital systems.

The XC17xxx family was developed specifically to provide factory-programmed, 5V-compatible configuration memory for Spartan and early Virtex FPGAs - targeting industrial and aerospace applications where OTP integrity and long-term obsolescence resistance are critical.

FAQ

What is the primary function of the XC17256EPDG8C in an FPGA system?

The XC17256EPDG8C serves as a one-time-programmable (OTP) configuration PROM for Xilinx Spartan-II and Virtex-E FPGAs. It stores the FPGA bitstream permanently and delivers it serially upon power-up. Unlike flash-based PROMs, XC17256EPDG8C cannot be reprogrammed in the field - its contents are set during manufacturing, ensuring configuration integrity throughout the product lifecycle.

Can the XC17256EPDG8C operate at 3.3V?

No, the XC17256EPDG8C is specified exclusively for 5.0 V ± 10% operation. It does not support 3.3V or mixed-voltage interfaces. Attempting to power XC17256EPDG8C at 3.3V will result in undefined timing, insufficient output drive, and potential configuration failure. Systems using 3.3V FPGAs require level translation or a different PROM family such as the XC18Vxx series.

Is the XC17256EPDG8C pin-compatible with standard 27C256 EPROMs?

Yes, the XC17256EPDG8C uses the same PDIP-8 package and pinout as industry-standard 27C256 EPROMs (e.g., AMD AM27C256, Atmel AT27C256R). Pin-for-pin connections match: VCC, GND, CE, OE, DATA, CLK, and NC positions align. This enables direct replacement in legacy sockets without PCB modification - provided the host FPGA configuration controller operates at 5V and expects automatic address incrementing.

Does the XC17256EPDG8C support in-system programming (ISP)?

No, the XC17256EPDG8C is a one-time-programmable device. Programming occurs only during wafer fabrication using laser or fuse technology. There is no ISP capability, no write command set, and no provision for field updates. All configuration data must be finalized before ordering, and the device functions solely as a read-only memory after assembly.

What is the moisture sensitivity level (MSL) of the XC17256EPDG8C?

XC17256EPDG8C is rated MSL-1 per JEDEC J-STD-020 - meaning it has unlimited floor life at ≤30°C/60% RH and requires no dry-bake prior to soldering. This reflects its PDIP-8 plastic package construction, which is inherently resistant to moisture absorption. Standard reflow profiles for Pb-free solder (peak 260°C) apply without preconditioning.