AMD XC1765ESO8C

Overview

XC1765ESO8C from AMD is a configuration PROM for Spartan-3 FPGAs, providing non-volatile serial bitstream storage with 65 Mbit capacity, 3.3 V supply voltage, and SO-8 package. It enables FPGA configuration at power-up in industrial control and test equipment systems.

For engineers reviewing the XC1765ESO8C datasheet, pinout, applications, or equivalent options, key selection criteria include serial configuration interface compatibility, 3.3 V I/O tolerance, programming voltage requirements, and SO-8 footprint alignment with Xilinx Spartan-3 FPGA configuration circuits.

Technical Context

This PROM uses a standard SPI-compatible serial interface (CLK, CS#, DI, DO) to deliver configuration data to Spartan-3 FPGAs during power-on initialization. It supports both master serial and slave serial configuration modes.

Internal architecture includes a one-time programmable (OTP) memory array with built-in CRC checking for bitstream integrity verification. Programming is performed via dedicated PROM programmers or FPGA development tools supporting Xilinx impact software.

Key Specifications

Pinout & Package

XC1765ESO8C is housed in an 8-pin Small Outline (SO-8) package with gull-wing leads, JEDEC MS-012AC compliant, 1.27 mm pitch, and 5.0 mm × 4.0 mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCF08PVO20C and XC18V04PC44C, XC1765ESO8C offers higher density in a compact SO-8 package with OTP security, making it optimal for new Spartan-3 designs prioritizing board area, startup reliability, and bitstream protection.

Availability

XC1765ESO8C is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and medical imaging systems requiring stable component supply and long-term FPGA configuration support.

Supply support for XC1765ESO8C 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 develops and supports FPGA configuration solutions including legacy Xilinx PROM families.

The XC1765ESO8C belongs to the Xilinx XC1700 series of one-time programmable configuration PROMs, designed specifically to support Spartan-3 FPGA configuration with minimal external components.

FAQ

What is the primary function of the XC1765ESO8C in an FPGA system?

The XC1765ESO8C serves as a non-volatile configuration PROM that stores and delivers the bitstream to Spartan-3 FPGAs during power-up. Its OTP architecture ensures the configuration remains fixed after programming, and its SO-8 package enables direct integration into FPGA configuration circuits without level shifters or additional logic. XC1765ESO8C is optimized for deterministic, secure FPGA initialization in industrial and test environments.

Can the XC1765ESO8C be reprogrammed after initial programming?

No, the XC1765ESO8C is a one-time programmable (OTP) device. Once programmed, its 65 Mbit memory array cannot be erased or rewritten. This design prevents accidental or malicious modification of the FPGA bitstream in deployed systems. XC1765ESO8C is intended for applications where configuration stability and security are critical, such as medical or avionics equipment.

Does the XC1765ESO8C support both master and slave serial configuration modes?

Yes, the XC1765ESO8C supports both master serial and slave serial configuration modes. In master mode, it drives the CCLK signal to the FPGA; in slave mode, it synchronizes to the FPGA's CCLK. This flexibility allows XC1765ESO8C to integrate into diverse system architectures, including those where the FPGA controls the configuration sequence or where external timing is preferred.

What is the role of the HOLD# pin on the XC1765ESO8C?

The HOLD# pin on the XC1765ESO8C is an active-low control signal that pauses serial data output without resetting the internal address counter. When asserted, it allows other devices on the same SPI bus to gain access while preserving the current read position. This feature is used in multi-PROM or shared-bus configurations where XC1765ESO8C must yield bus control temporarily without interrupting the configuration flow.

Is the XC1765ESO8C compatible with Xilinx Impact programming software?

Yes, the XC1765ESO8C is fully supported by Xilinx Impact software for programming via compatible PROM programmers. Impact recognizes XC1765ESO8C as part of the XC1700 family and handles bitstream formatting, address mapping, and CRC generation automatically. Users must select the correct device and ensure proper voltage settings (3.3 V) during programming to avoid damage to XC1765ESO8C.