AMD XC17256EPCG20C

Overview

XC17256EPCG20C from AMD is a 256-kbit serial configuration PROM designed for Xilinx FPGA initialization, featuring 5V supply voltage, 20-pin PLCC package, 150 ns access time, and industrial temperature range (–40°C to +85°C). It stores bitstream data to configure Spartan, Virtex, and XC9500 CPLD devices at power-up.

For engineers reviewing the XC17256EPCG20C datasheet, pinout, applications, or equivalent options, key selection criteria include VCC compatibility with target FPGA configuration voltage, PLCC-20 mechanical fit in legacy socketed designs, read timing compliance with FPGA INIT clock requirements, and industrial-grade reliability for embedded control systems.

Technical Context

This PROM operates in serial mode using a simple 2-wire interface (CLK and DATA) synchronized to the FPGA's configuration clock. It supports master serial and slave serial configuration modes, with automatic power-on reset detection and internal address counter incrementing on each CLK edge.

Internal architecture includes a static memory array organized as 32K × 8 bits, CMOS-compatible I/O, and a dedicated output enable (OE#) pin for bus sharing. No internal voltage regulation or level-shifting circuitry is present - VCC must match the FPGA's configuration I/O voltage.

Key Specifications

Pinout & Package

20-pin PLCC (Plastic Leaded Chip Carrier), JEDEC MS-018AC compliant, 0.75-inch square body, 0.050-inch lead pitch, J-bend leads for socket insertion or infrared reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC17256EPCG20C, XCF02SVO20C requires system-level voltage redesign while AT17LV256-10JC offers direct PLCC-20 compatibility with tighter timing and broader voltage tolerance - making it the strongest alternative for industrial upgrades without PCB revision.

Availability

XC17256EPCG20C is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom line cards, automated test equipment, and avionics sensor modules requiring stable component supply and long-term obsolescence management.

Supply support for XC17256EPCG20C 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 oversees legacy Xilinx configuration PROM product lines including the XC17 family.

The XC17 series was originally developed by Xilinx to provide standardized, single-chip configuration memory for their early FPGA families, targeting cost-sensitive, socket-based industrial and telecom applications.

FAQ

What is the primary function of the XC17256EPCG20C in an FPGA-based system?

The XC17256EPCG20C serves as a nonvolatile serial configuration PROM that stores and delivers the FPGA bitstream at power-up. It initializes Xilinx Spartan, Virtex, and XC9500 devices using a 2-wire interface (CLK/DATA), ensuring deterministic startup without host processor involvement. The XC17256EPCG20C is specifically engineered for 5V systems and legacy socketed designs.

Can the XC17256EPCG20C be used with modern 3.3V FPGAs?

No, the XC17256EPCG20C requires a strict 5V ±10% supply and has 5V-tolerant I/O only. It is incompatible with 3.3V-only FPGA configuration interfaces unless external level-shifting circuitry is added. For native 3.3V support, consider alternatives like the XCF02SVO20C or AT17LV256-10JC, both verified for mixed-voltage operation alongside the XC17256EPCG20C.

Is the XC17256EPCG20C still in production or considered obsolete?

The XC17256EPCG20C is classified as a mature product under AMD's legacy Xilinx portfolio. While no longer in high-volume production, Aetrix Electronics maintains traceable inventory with full lot documentation and supports long-term supply through authorized channels and lifecycle management programs for industrial and aerospace customers relying on the XC17256EPCG20C.

What does the 'C' suffix in XC17256EPCG20C indicate?

The 'C' suffix in XC17256EPCG20C denotes industrial temperature grade (–40°C to +85°C), distinguishing it from commercial-grade variants (e.g., 'I' suffix for 0°C to +70°C). This grading ensures performance stability across thermal extremes encountered in factory automation, outdoor infrastructure, and transportation electronics using the XC17256EPCG20C.

Does the XC17256EPCG20C support in-system programming (ISP)?

No, the XC17256EPCG20C is a one-time programmable (OTP) PROM and does not support in-system programming. Programming must be performed prior to system integration using a compatible PROM programmer (e.g., Xilinx Parallel Cable III or third-party universal programmers). Once programmed, the XC17256EPCG20C retains data indefinitely but cannot be electrically erased or rewritten in-circuit.