XC18V04PC44I

Overview

The XC18V04PC44I is a 4 Mbit in-system programmable EEPROM designed for Xilinx FPGA configuration. It operates at a maximum frequency of 33 MHz with a supply voltage range of 3.0 V to 3.6 V. The device supports serial and parallel data interfaces, featuring 5V tolerant I/O pins compatible with 5V, 3.3V, and 2.5V signals. It provides dual output capabilities at 3.3V or 2.5V and includes JTAG boundary-scan support. The component is housed in a PLCC-44 package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports in-system programming via standard 4-pin JTAG protocol for efficient design iterations without package handling.
• Enables cascading of multiple devices using the CEO output to drive the CE input of subsequent PROMs in a chain.
• Provides IEEE 1149.1 boundary-scan compliance with dedicated TAP controller and registers for testing and programming.
• Incorporates advanced data security features allowing users to inhibit internal pattern reading via JTAG while permitting erase operations.

Applications

• Configuration of Xilinx Virtex-II FPGAs requiring 4 Mbit storage capacity
• Master Serial mode FPGA initialization upon power-up
• Slave Parallel or Slave-SelectMAP mode configuration driven by external clocks
• Cascaded memory systems for FPGAs exceeding single device bitstream limits

Procurement Notes

Verify the specific ordering suffix 'PC44' confirms the PLCC-44 package type and industrial temperature grade (-40°C to +85°C). Ensure compatibility with the target Xilinx FPGA's voltage requirements, as the XC18V04PC44I supports 3.3V or 2.5V outputs but requires 3.3V logic for VCCINT. Confirm that the design utilizes the correct JTAG pinout for the 44-pin PLCC variant, noting that NC pins must remain unconnected.

Selection Notes

Select this component when a 4 Mbit non-volatile configuration memory is required for Xilinx FPGAs such as the XC2VP4 or XC2V500. Choose the PC44 package if surface-mount PLCC form factor is preferred over VQFP or SOIC options. Consider cascading multiple units if the target FPGA configuration bit count exceeds 4 Mbit. Verify that the system design accommodates the 3.3V or 2.5V VCCO selection based on the FPGA's input buffer requirements.

Part Context

The XC18V04PC44I belongs to the XC18V00 series of in-system programmable configuration PROMs manufactured by AMD/Xilinx. This family includes variants with capacities ranging from 512 Kbit to 4 Mbit. These devices are specifically engineered to store and provide configuration bitstreams to Xilinx FPGAs, supporting both serial and parallel interface modes for flexible system integration.

Replacement Considerations

Compatible substitutes include other members of the XC18V00 series, such as XC18V02 or XC18V01, provided the capacity meets the FPGA requirements. For larger configurations, multiple XC18V04 devices can be cascaded. The XC17V00 one-time programmable Serial PROM family is also noted as compatible for cascading purposes in the documentation.