Product Overview: AMD XC1765ESO8I Configuration Memory

The XC1765ESO8I is a specialized one-time programmable (OTP) configuration PROM designed specifically for FPGA programming applications. Manufactured by AMD (formerly Xilinx), this 65-kilobit serial configuration memory provides reliable, non-volatile storage for Xilinx FPGA bitstream data in a compact 8-SOIC surface mount package.

Note: The XC1765ESO8I has been designated as obsolete and is no longer in active production. Please refer to the substitutes section below for current alternatives.

Key Technical Specifications

Main Features and Benefits

High-Reliability Configuration Storage

The XC1765ESO8I provides dependable non-volatile storage for FPGA configuration data, ensuring your design loads correctly every time power is applied. The OTP technology guarantees data retention without requiring battery backup or external memory maintenance.

Compact 8-SOIC Package Design

With its industry-standard 8-pin SOIC package measuring just 3.90mm in width, this configuration PROM offers excellent space efficiency for embedded systems and compact PCB layouts where board real estate is at a premium.

Wide Operating Temperature Range

Engineered for industrial applications, the XC1765ESO8I operates reliably across an extended temperature range from -40°C to +85°C, making it suitable for harsh environmental conditions in automotive, industrial control, telecommunications, and aerospace applications.

5V TTL-Compatible Operation

The device operates on a standard 5V supply voltage (4.5V to 5.5V range), providing direct compatibility with legacy 5V TTL logic systems and older generation Xilinx FPGAs without requiring level shifters or additional interface circuitry.

Technical Performance Characteristics

Memory Architecture Details

Electrical Characteristics

Application Use Cases

FPGA Configuration Management

The primary application for the XC1765ESO8I is storing configuration bitstreams for Xilinx FPGA devices. Upon power-up or reset, the FPGA reads the configuration data from the PROM, allowing the system to become operational without external intervention.

Embedded System Design

Ideal for embedded control systems requiring reliable FPGA-based processing, including industrial automation controllers, motor drives, process control equipment, and specialized instrumentation where FPGA reconfiguration is unnecessary after initial programming.

Legacy System Maintenance

While obsolete for new designs, the XC1765ESO8I remains valuable for maintaining existing equipment and legacy systems that were originally designed around this specific component, ensuring continued operation of fielded products.

Telecommunications Infrastructure

Suitable for telecommunications base stations, network switches, and routing equipment where FPGAs provide custom protocol processing and the configuration must remain stable across power cycles without external memory support.

Pin Configuration and Interface

8-SOIC Pin Assignments

Interface Timing Requirements

The XC1765ESO8I supports serial configuration protocols compatible with Xilinx FPGA configuration interfaces. Clock frequencies typically range from DC to 10 MHz, with setup and hold times specified in the device datasheet for reliable data transfer.

Recommended Substitutes and Alternatives

Since the XC1765ESO8I has been discontinued, designers should consider these current alternatives:

Direct Functional Replacement

AT17LV65-10CI (Microchip Technology)

• Memory capacity: 65 kilobits (identical)
• Package: 8-SOIC surface mount
• Supply voltage: 2.7V to 3.6V (low voltage variant)
• Temperature range: -40°C to +85°C (Industrial)
• Current availability: In stock
• Pin-compatible with similar functionality

Modern Configuration Solutions

Design Considerations and Best Practices

PCB Layout Guidelines

When designing with the XC1765ESO8I or its substitutes, maintain clean signal routing between the configuration PROM and FPGA. Keep clock and data traces short, use proper decoupling capacitors (0.1µF ceramic) close to the VCC pin, and ensure solid ground plane connectivity.

Power Supply Stability

Provide a stable 5V supply with less than 50mV ripple to ensure reliable programming and readout operations. Add bulk capacitance (10µF to 100µF) near the power entry point to handle transient loads during configuration.

Programming Considerations

Since this is an OTP device, programming is permanent and cannot be reversed. Thoroughly verify the bitstream data before programming. Use qualified device programmers and follow recommended programming algorithms specified by AMD.

Obsolescence Management Strategy

For existing designs using XC1765ESO8I, develop a transition plan to modern alternatives. Evaluate current inventory levels, identify suitable substitutes, and test replacement components thoroughly before committing to production changes.

Quality and Environmental Compliance

Manufacturing Standards

The XC1765ESO8I was manufactured to industry-standard quality specifications with rigorous testing procedures ensuring reliable operation over the specified temperature and voltage ranges throughout the product lifecycle.

Environmental Certifications

This device complies with RoHS (Restriction of Hazardous Substances) directives, making it suitable for commercial products sold in the European Union and other markets with similar environmental regulations.

Handling and Storage

Store devices in moisture-sensitive device (MSD) bags when not in use. Follow IPC/JEDEC J-STD-020 standards for moisture sensitivity level classification and baking procedures if required before soldering operations.

Frequently Asked Questions

What makes the XC1765ESO8I different from Flash-based configuration memory?

The XC1765ESO8I uses OTP (One-Time Programmable) technology, meaning once programmed, the data cannot be changed. Flash-based memories can be erased and reprogrammed multiple times, offering greater flexibility but potentially higher cost.

Can I still purchase the XC1765ESO8I?

The XC1765ESO8I has been designated obsolete by AMD and is no longer in active production. Limited stock may be available through authorized distributors or the secondary market, but transitioning to current alternatives is recommended for new designs.

What Xilinx FPGA families are compatible with this configuration PROM?

The XC1765ESO8I was designed for older Xilinx FPGA families including Spartan, Spartan-II, and similar generation devices that use serial master or slave configuration modes with 5V-compatible interfaces.

How do I migrate from XC1765ESO8I to a modern solution?

Evaluate your system requirements, consider alternatives like AT17LV65-10CI for drop-in replacement, or explore modern serial Flash memory solutions offering higher capacity and lower power consumption. Update PCB layouts and firmware as necessary.

What is the maximum configuration speed?

The device supports serial clock frequencies up to approximately 10 MHz, resulting in configuration times determined by bitstream size and clock frequency. Typical FPGA configuration completes within milliseconds.

Summary and Recommendations

The XC1765ESO8I served as a reliable configuration memory solution for Xilinx FPGA applications requiring non-volatile bitstream storage in space-constrained designs. While the device has reached end-of-life status, its legacy continues in systems deployed worldwide.

For maintaining existing equipment, limited stock availability may support short-term needs. However, forward-looking designs should transition to current alternatives offering improved specifications, better availability, and lower total cost of ownership.

Engineers working with Xilinx FPGA platforms should evaluate modern configuration options including serial Flash memory, embedded configuration resources, or compatible replacement PROMs like the AT17LV65-10CI to ensure long-term product availability and support.