XC18V256PC20I

Overview

The XC18V256PC20I is a 256-Kbit in-system programmable configuration PROM from the Xilinx XC18V00 series. It utilizes a low-power advanced CMOS FLASH process and operates on a 3.3V core supply with 5V tolerant I/Os. The device supports dual configuration modes: serial (up to 33 MHz) and parallel (up to 264 Mb/s at 33 MHz). It features IEEE Std 1149.1 JTAG support for programming and boundary-scan testing, ensuring compatibility with Xilinx FPGAs and CPLDs.

Feature Summary

• Supports in-system programming via standard 4-pin JTAG protocol for efficient design iterations without package handling.
• Provides dual configuration interfaces including Master/Slave Serial and Slave-Parallel/SelectMAP modes for flexible FPGA integration.
• Incorporates 5V tolerant I/O pins that accept 5V, 3.3V, and 2.5V signals, allowing direct connection to mixed-voltage systems.
• Enables cascading of multiple devices using the CEO output to drive the CE input of subsequent PROMs for larger bitstreams.

Applications

• Configuration of Xilinx Virtex, Spartan, and Virtex-II FPGA families
• Storage of configuration bitstreams for Xilinx CPLDs
• In-system programming and verification of FPGA designs

Procurement Notes

Verify the specific suffix 'PC20' corresponds to the 20-pin PLCC package as defined in the official datasheet. Confirm that the operating voltage range and temperature specifications align with your system requirements. Ensure that the JTAG interface connections match the pinout described for the 20-pin variant, noting that the CF function may require specific routing settings.

Selection Notes

Select this component when a 256-Kbit capacity is sufficient for the target FPGA configuration. The PC20 package is suitable for applications requiring a compact 20-pin footprint. Consider the 5V tolerant I/O feature if interfacing with legacy 5V logic levels. Verify that the required configuration mode (Serial or Parallel) is supported by the target FPGA's mode pins.

Part Context

The XC18V256PC20I belongs to the XC18V00 series of in-system programmable configuration PROMs manufactured by Xilinx. This series provides cost-effective solutions for storing and reprogramming large FPGA configuration bitstreams. The devices are designed to work seamlessly with various Xilinx FPGA families, offering high endurance and data retention capabilities.

Replacement Considerations

Compatible replacements within the same family include other XC18V00 series devices such as XC18V01, XC18V02, XC18V04, and XC18V512, depending on the required memory capacity. Devices from the XC17V00 one-time programmable Serial PROM family are also compatible for cascading purposes, though they lack in-system reprogrammability.