AMD XC1765ELPD8C

Overview

XC1765ELPD8C from AMD is a 65K-bit serial PROM configured for Xilinx FPGA configuration, operating at 5V supply with 15 ns access time and industrial temperature range (–40°C to +85°C), used in embedded reconfiguration systems for legacy Xilinx devices.

For engineers reviewing the XC1765ELPD8C datasheet, pinout, applications, or equivalent options, key selection factors include VCC compatibility, read access timing, package footprint, and FPGA configuration interface support per Xilinx XC4000 family requirements.

Technical Context

This device implements a one-time-programmable (OTP) serial PROM architecture optimized for bitstream loading into Xilinx XC4000-series FPGAs. It uses CMOS technology with TTL-compatible inputs and outputs, and supports standard serial configuration protocols including master serial mode.

The XC1765ELPD8C features internal address sequencing, automatic power-up initialization, and a dedicated PROGRAM pin for factory programming. Its timing is specified for 5V operation only, with no support for 3.3V or mixed-voltage interfaces.

Key Specifications

Pinout & Package

XC1765ELPD8C is housed in an 8-pin plastic dual in-line package (PDIP) with 0.300" body width and 0.100" pin pitch, designed for through-hole assembly and legacy board compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC1765ELPD8C, XC1765D offers surface-mount flexibility at the cost of mechanical retrofitting, while XC1765ELPD8I extends thermal capability without layout change-both require verification of FPGA configuration timing compliance.

Availability

XC1765ELPD8C is available at Aetrix Electronics and suitable for legacy FPGA configuration, industrial control reconfiguration, and aerospace avionics boot requiring stable component supply and long-term obsolescence management.

Supply support for XC1765ELPD8C 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 is a global semiconductor company specializing in high-performance computing, adaptive SoCs, and programmable logic solutions, with deep heritage in FPGA and configuration memory technologies.

The XC17xx series was developed by AMD specifically to support Xilinx's early-generation FPGA families, delivering reliable, single-supply serial configuration memory for industrial and aerospace applications.

FAQ

What is the primary function of the XC1765ELPD8C in FPGA-based systems?

The XC1765ELPD8C serves as a one-time-programmable serial PROM that stores and delivers the configuration bitstream to Xilinx XC4000-series FPGAs during power-up. Its 65K-bit capacity matches the requirements of XC4010/XC4020/XC4025 devices. The XC1765ELPD8C operates exclusively at 5V and uses a 3-wire serial interface (DATA, CLOCK, PROGRAM) to enable deterministic, hardware-controlled FPGA initialization without software intervention.

Can the XC1765ELPD8C be reprogrammed in the field?

No, the XC1765ELPD8C is a one-time-programmable (OTP) device. Programming occurs only once during manufacturing using the PROGRAM pin under controlled voltage and timing conditions. Once programmed, the bitstream is permanently stored and cannot be altered. This ensures configuration integrity and prevents unauthorized modification in deployed systems where the XC1765ELPD8C is used.

Is the XC1765ELPD8C compatible with 3.3V FPGA configuration interfaces?

No, the XC1765ELPD8C is specified for 5V-only operation and is not 3.3V tolerant. Its inputs and outputs are TTL-compatible and require a 5.0 V ± 5% supply. Interfacing with 3.3V FPGAs or controllers requires level-shifting circuitry. The XC1765ELPD8C does not support mixed-voltage operation, and using it outside its 5V specification may result in unreliable configuration or device damage.

What package type does the XC1765ELPD8C use, and is it RoHS-compliant?

The XC1765ELPD8C uses an 8-pin plastic dual in-line package (PDIP) with 0.300" width and through-hole leads. Per AMD documentation, this variant predates RoHS legislation and is exempt from lead-free requirements; it contains leaded solder terminations. For RoHS-compliant alternatives, engineers should evaluate newer configuration PROM families or consult Aetrix Electronics for legacy-compliant sourcing options for the XC1765ELPD8C.

How does the 15 ns access time of the XC1765ELPD8C impact FPGA startup performance?

The 15 ns maximum access time of the XC1765ELPD8C reduces FPGA configuration latency during power-on, enabling faster system readiness in time-sensitive applications such as industrial motion control or test equipment. This timing directly affects the minimum clock period supported during master serial configuration. The XC1765ELPD8C's access speed allows tighter synchronization with FPGA CCLK, supporting higher configuration throughput than slower PROMs without requiring additional wait states.