The XC1765EPD8C is a high-reliability 64Kbit (65,536-bit) one-time programmable serial configuration PROM manufactured by AMD (formerly Xilinx). This compact 8-pin PDIP device provides a cost-effective and easy-to-use solution for storing Xilinx FPGA configuration bitstreams in industrial and commercial applications.
XC1765EPD8C Key Specifications
| Parameter |
Value |
| Part Number |
XC1765EPD8C |
| Manufacturer |
AMD (Xilinx) |
| Memory Type |
Serial Configuration PROM (OTP) |
| Memory Density |
64Kbit (65,536 bits) |
| Supply Voltage |
5V |
| Package Type |
8-Pin PDIP |
| Operating Temperature |
0°C to +70°C (Commercial) |
| Technology |
Low-Power CMOS Floating-Gate |
| Data Retention |
20 Years Minimum |
| Product Status |
Active / End-of-Life |
XC1765EPD8C Product Overview
The XC1765EPD8C belongs to the XC1700 family of configuration PROMs designed specifically for Xilinx FPGA configuration storage. This one-time programmable memory device stores FPGA bitstreams and automatically loads them during system power-up, enabling instant FPGA functionality without external processors or boot sequences.
Why Choose the XC1765EPD8C Configuration PROM?
Engineers select the XC1765EPD8C for embedded systems requiring reliable, non-volatile FPGA configuration memory. The 5V operating voltage ensures compatibility with legacy systems, while the compact 8-pin PDIP package simplifies PCB layout and prototyping.
XC1765EPD8C Technical Features
Memory and Performance Specifications
| Feature |
Description |
| Memory Architecture |
Serial Read-Only Memory |
| Bit Density |
65,536 bits (64Kb) |
| Data Output |
Serial (Single Pin) |
| Programming Type |
One-Time Programmable (OTP) |
| Access Time |
Fast Clock-to-Data Output |
| Configuration Mode |
Master Serial / Slave Serial |
Electrical Characteristics
| Parameter |
Min |
Typ |
Max |
Unit |
| Supply Voltage (VCC) |
4.75 |
5.0 |
5.25 |
V |
| Input High Voltage (VIH) |
2.0 |
– |
VCC+0.5 |
V |
| Input Low Voltage (VIL) |
-0.5 |
– |
0.8 |
V |
| Supply Current (ICC) |
– |
5 |
10 |
mA |
| Standby Current (ISB) |
– |
100 |
500 |
µA |
XC1765EPD8C Pin Configuration
8-Pin PDIP Pinout Diagram
| Pin Number |
Pin Name |
Function |
| 1 |
CLK |
Clock Input |
| 2 |
RESET/OE |
Reset / Output Enable |
| 3 |
CEO |
Chip Enable Output (Cascade) |
| 4 |
GND |
Ground |
| 5 |
DATA |
Serial Data Output |
| 6 |
CE |
Chip Enable Input |
| 7 |
NC |
No Connection |
| 8 |
VCC |
Power Supply (+5V) |
FPGA Configuration Modes Supported
The XC1765EPD8C supports two primary configuration modes for seamless integration with Xilinx FPGAs.
Master Serial Mode Operation
In Master Serial mode, the FPGA generates the configuration clock signal that drives the XC1765EPD8C. After a brief access time following each rising clock edge, data appears on the PROM DATA output pin connected to the FPGA DIN pin. The FPGA autonomously generates the required clock pulses to complete configuration, then disables the PROM.
Slave Serial Mode Operation
In Slave Serial mode, both the XC1765EPD8C and the target FPGA receive clock signals from an external source. This mode provides greater flexibility in multi-device systems where centralized timing control is required.
XC1765EPD8C Application Guide
Compatible FPGA Families
The XC1765EPD8C configuration PROM supports the following Xilinx FPGA families:
| FPGA Family |
Compatibility |
Notes |
| XC3000 Series |
✓ Full Support |
Legacy applications |
| XC4000 Series |
✓ Full Support |
Industrial systems |
| Spartan Series |
✓ Full Support |
Cost-optimized designs |
| XC5200 Series |
✓ Full Support |
General purpose |
Cascading Multiple PROMs
For applications requiring larger bitstream storage, multiple XC1765EPD8C devices can be cascaded using the CEO (Chip Enable Output) signal. This output drives the CE input of the subsequent PROM in the chain, enabling seamless configuration of larger FPGAs or storage of multiple bitstreams.
Cascading Configuration:
- Connect CEO of first PROM to CE of second PROM
- Connect all CLK inputs together
- Connect all DATA outputs together
- First device CE connects to system reset
Design Considerations for XC1765EPD8C
PCB Layout Recommendations
| Recommendation |
Details |
| Decoupling Capacitor |
Place 0.1µF ceramic capacitor near VCC pin |
| Trace Length |
Keep CLK and DATA traces as short as possible |
| Ground Plane |
Use solid ground plane beneath device |
| ESD Protection |
Consider TVS diodes on I/O lines |
Programming Requirements
The XC1765EPD8C requires third-party device programmers for initial bitstream loading. Leading programmer manufacturers supporting this device include:
- Data I/O
- BP Microsystems
- Xeltek
- Hi-Lo Systems
XC1765EPD8C vs. Alternative Configuration Solutions
| Parameter |
XC1765EPD8C |
XC17128E |
XCF01S |
| Memory Size |
64Kbit |
128Kbit |
1Mbit |
| Voltage |
5V |
5V/3.3V |
3.3V |
| Package |
8-PDIP |
8-SOIC |
8-SOIC |
| Type |
OTP |
OTP |
ISP Flash |
| Reprogrammable |
No |
No |
Yes |
| Cost |
Low |
Medium |
Higher |
Ordering Information
XC1765EPD8C Part Number Breakdown
| Code |
Meaning |
| XC17 |
Xilinx Configuration PROM Family |
| 65 |
65K (64Kbit) Memory Density |
| E |
Enhanced Version |
| PD |
Plastic DIP Package |
| 8 |
8-Pin Count |
| C |
Commercial Temperature (0°C to +70°C) |
Available Package Variants
| Part Number |
Package |
Temperature Range |
| XC1765EPD8C |
8-PDIP |
Commercial (0°C to +70°C) |
| XC1765EPD8I |
8-PDIP |
Industrial (-40°C to +85°C) |
| XC1765ESOG8C |
8-SOIC |
Commercial (0°C to +70°C) |
| XC1765EVO8C |
8-TSOP |
Commercial (0°C to +70°C) |
Quality and Reliability
Compliance and Certifications
| Standard |
Compliance |
| Data Retention |
20+ Years Guaranteed |
| Lead-Free |
Pb-Free Options Available |
| RoHS |
Compliant |
| Moisture Sensitivity |
MSL Level 1 |
Technical Support and Resources
Documentation Available
- XC1700 Family Datasheet (DS027)
- Application Notes for FPGA Configuration
- Programming Guide for Third-Party Programmers
- Xilinx Alliance and Foundation Software Support
Software Compatibility
The XC1765EPD8C is fully supported by Xilinx ISE Design Suite for bitstream generation and PROM file creation. Engineers can generate .BIT and .MCS files directly from their FPGA design projects.
Frequently Asked Questions
What FPGAs are compatible with XC1765EPD8C?
The XC1765EPD8C supports Xilinx XC3000, XC4000, XC5200, and early Spartan family FPGAs requiring 64Kbit or smaller configuration bitstreams.
Can I reprogram the XC1765EPD8C?
No. The XC1765EPD8C is a one-time programmable (OTP) device. For reprogrammable solutions, consider the XCF series in-system programmable Flash PROMs.
What is the maximum clock frequency?
The XC1765EPD8C supports configuration clock frequencies up to 10MHz, depending on system requirements and timing margins.
Is the XC1765EPD8C still available?
The XC1765EPD8C is classified as a mature product. While new designs may consider newer alternatives, existing inventory remains available through authorized distributors.
Summary
The XC1765EPD8C delivers proven reliability for Xilinx FPGA configuration in cost-sensitive applications. With its 64Kbit memory capacity, 5V operation, and compact 8-pin PDIP package, this serial configuration PROM remains a practical choice for legacy system maintenance and designs requiring simple, non-volatile FPGA boot solutions.
For additional technical specifications, compatibility information, or to request a quote, contact your authorized distributor or visit the manufacturer’s documentation portal.
