The XC1701PD8I is a high-performance 1Mbit one-time programmable (OTP) serial configuration PROM designed specifically for storing Xilinx FPGA configuration bitstreams. This industrial-grade memory solution from AMD (formerly Xilinx) offers reliable, cost-effective FPGA configuration storage in a compact 8-pin PDIP package, making it ideal for demanding embedded applications requiring extended temperature operation.

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XC1701PD8I Key Features and Benefits

The XC1701PD8I configuration PROM delivers exceptional performance and reliability for FPGA-based designs. Engineers choose this device for its straightforward integration and robust industrial specifications.

One-Time Programmable Memory Technology

The XC1701PD8I utilizes proven OTP technology that guarantees data integrity over the entire product lifecycle. Once programmed, the configuration bitstream remains permanently stored, eliminating concerns about data corruption or accidental overwrites in field-deployed applications.

Simple FPGA Interface Design

This serial configuration PROM requires only one user I/O pin for interfacing with your target FPGA device. The streamlined connection reduces PCB complexity and minimizes potential signal integrity issues in high-density board layouts.

Cascadable Architecture for Extended Storage

Multiple XC1701PD8I devices can be cascaded together using the CEO (Chip Enable Output) and CE (Chip Enable) pins. This cascading capability enables storage of longer configuration bitstreams or multiple FPGA configurations within a single system design.

Programmable Reset Polarity

The device features programmable reset polarity, supporting both active-high and active-low configurations. This flexibility ensures compatibility across various FPGA families and simplifies integration into existing system architectures.

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XC1701PD8I Technical Specifications

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XC1701PD8I Pin Configuration and Pinout

Understanding the XC1701PD8I pinout is essential for successful PCB design and system integration.

Important Design Note: Always tie the VPP pin directly to VCC in your application circuit. Never leave VPP floating, as this may cause unpredictable device behavior.

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XC1701PD8I Configuration Modes

Master Serial Mode Operation

In Master Serial mode, the target FPGA generates the configuration clock (CCLK) that drives the XC1701PD8I. After each rising clock edge, configuration data appears on the DATA output pin with minimal access time delay. The FPGA automatically generates the required number of clock pulses to complete the configuration sequence, then disables the PROM to reduce power consumption.

Slave Serial Mode Operation

When operating in Slave Serial mode, both the XC1701PD8I and the target FPGA receive clock signals from an external source. This mode is particularly useful in multi-device configurations or when precise timing control is required across multiple FPGAs sharing a common configuration clock.

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XC1701PD8I Package Information

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XC1701PD8I vs XC1701PC20C Comparison

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XC1701PD8I Supported FPGA Families

The XC1701PD8I serial configuration PROM supports configuration of multiple Xilinx FPGA device families:

• Spartan Series: Spartan-II, Spartan-IIE, Spartan-3
• Virtex Series: Virtex, Virtex-E, Virtex-II
• XC4000 Family: XC4000E, XC4000EX, XC4000XL, XC4000XLA, XC4000XV
• Legacy Devices: XC3000, XC5200 Series

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XC1701PD8I Industrial Applications

Telecommunications Equipment

The industrial temperature rating makes the XC1701PD8I ideal for telecommunications infrastructure equipment operating in harsh outdoor environments or temperature-controlled equipment rooms.

Industrial Automation Systems

Factory automation controllers, programmable logic controllers (PLCs), and motor drive systems benefit from the reliable FPGA configuration storage provided by the XC1701PD8I.

Medical Device Manufacturing

Medical equipment requiring consistent, reliable FPGA initialization across extended temperature ranges utilizes the XC1701PD8I for critical configuration storage.

Automotive Electronics

While not automotive-qualified, the extended temperature range supports many automotive accessory and aftermarket applications requiring robust FPGA configuration solutions.

Aerospace and Defense

Military and aerospace applications leverage the industrial specifications and proven reliability of the XC1701PD8I for mission-critical FPGA configuration storage.

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XC1701PD8I Programming Requirements

Compatible Programming Software

• Xilinx ISE Design Suite (Legacy Versions)
• Xilinx Vivado Design Suite
• Alliance Software Package
• Foundation Series Software

Supported PROM Programmers

The XC1701PD8I is compatible with most commercial PROM programmers that support Xilinx configuration PROMs. The programming file format is standard Intel HEX or Motorola S-Record, generated directly from the FPGA design tools.

Programming Voltage Specifications

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XC1701PD8I Design Considerations

Power Supply Decoupling

Place a 0.1µF ceramic bypass capacitor as close as possible to the VCC pin. For optimal noise immunity, add a 10µF bulk capacitor on the power supply rail feeding the XC1701PD8I.

PCB Layout Guidelines

• Keep clock traces short and direct to minimize signal degradation
• Route the DATA output with controlled impedance if trace length exceeds 2 inches
• Provide adequate ground plane coverage beneath the device
• Maintain proper clearance from high-speed digital or RF circuitry

Cascading Multiple Devices

When cascading multiple XC1701PD8I devices for extended bitstream storage:

1. Connect all CLK inputs together
2. Connect all DATA outputs together
3. Route CEO of first device to CE of second device
4. Continue CEO-to-CE chain for additional devices
5. Ground the CE input of the first device in the chain

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XC1701PD8I Ordering Information

Part Number Decoder

• XC1701: 1Mbit Configuration PROM Family
• P: Plastic Package
• D8: 8-Pin DIP Package
• I: Industrial Temperature Range (-40°C to +85°C)
• C: Commercial Temperature Range (0°C to +70°C)

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Frequently Asked Questions About XC1701PD8I

What is the XC1701PD8I used for?

The XC1701PD8I is a serial configuration PROM specifically designed to store FPGA configuration bitstreams. When power is applied to the system, this device automatically provides the configuration data needed to initialize Xilinx FPGA devices.

Can the XC1701PD8I be reprogrammed?

No, the XC1701PD8I is a one-time programmable (OTP) device. Once programmed, the configuration data cannot be changed or erased. For applications requiring in-system reprogramming, consider the XC18V series of ISP configuration PROMs.

How many configuration bits does the XC1701PD8I store?

The XC1701PD8I provides 1,048,576 bits (1 Megabit) of configuration storage, sufficient for most small to medium-sized Xilinx FPGA devices.

What is the difference between the I and C suffix?

The I suffix indicates Industrial temperature range (-40°C to +85°C), while the C suffix indicates Commercial temperature range (0°C to +70°C). Choose the appropriate version based on your application’s environmental requirements.

Is the XC1701PD8I RoHS compliant?

Lead-free, RoHS-compliant versions of the XC1701PD8I are available. Verify the specific ordering code with your distributor to ensure compliance with environmental regulations.

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XC1701PD8I Technical Documentation

For complete technical specifications, timing diagrams, and application notes, refer to the official AMD (Xilinx) documentation:

• XC1700/XC1701 Family Data Sheet
• FPGA Configuration User Guide
• Serial Configuration PROM Application Notes

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Summary

The XC1701PD8I delivers reliable, industrial-grade FPGA configuration storage in a space-efficient 8-pin PDIP package. With 1Mbit of OTP memory, extended temperature operation from -40°C to +85°C, and straightforward serial interface design, this configuration PROM remains an excellent choice for demanding embedded applications requiring proven Xilinx FPGA configuration solutions.

Whether designing telecommunications equipment, industrial automation systems, or medical devices, the XC1701PD8I provides the reliability and performance engineers demand for production FPGA-based products.