The XC17256EPD8I is a high-performance 256Kb serial configuration PROM manufactured by AMD (formerly Xilinx). This one-time programmable (OTP) memory device is specifically designed to store configuration bitstreams for Xilinx FPGA devices. With its industrial-grade temperature rating and reliable 8-pin PDIP package, the XC17256EPD8I delivers exceptional performance for embedded systems, industrial automation, telecommunications, and aerospace applications.
XC17256EPD8I Key Features and Benefits
The XC17256EPD8I configuration PROM offers several advantages that make it an ideal choice for FPGA configuration storage:
One-Time Programmable (OTP) Technology
The XC17256EPD8I utilizes OTP technology, providing secure and permanent storage for FPGA configuration data. Once programmed, the bitstream cannot be altered, ensuring data integrity and protection against unauthorized modifications.
Simple FPGA Interface Design
This configuration PROM requires only one user I/O pin for interfacing with Xilinx FPGAs, simplifying PCB layout and reducing design complexity. The straightforward serial interface makes integration seamless across various applications.
Cascadable Architecture
Multiple XC17256EPD8I devices can be cascaded together using the CEO (Chip Enable Output) and CE (Chip Enable) pins. This feature allows storage of longer bitstreams or multiple configuration files for larger FPGA designs.
Programmable Reset Polarity
The XC17256EPD8I supports both active-high and active-low reset configurations, providing flexibility to match different FPGA reset requirements and system architectures.
XC17256EPD8I Technical Specifications
| Parameter |
Specification |
| Manufacturer |
AMD (Xilinx) |
| Part Number |
XC17256EPD8I |
| Memory Type |
Serial Configuration PROM |
| Memory Size |
256Kb (262,144 bits) |
| Memory Organization |
256K x 1 |
| Programmable Type |
OTP (One-Time Programmable) |
| Supply Voltage |
4.5V to 5.5V |
| Operating Frequency |
15 MHz |
| Operating Temperature |
-40°C to +85°C (Industrial) |
| Package Type |
8-Pin PDIP |
| Mounting Type |
Through-Hole |
XC17256EPD8I Package Information
| Specification |
Details |
| Package Style |
PDIP (Plastic Dual In-Line Package) |
| Pin Count |
8 Pins |
| Package Width |
0.300″ (7.62mm) |
| Lead Pitch |
2.54mm |
| Lead Type |
Through-Hole |
| Packaging Method |
Tube |
XC17256EPD8I Pin Configuration
| Pin Number |
Pin Name |
Function |
| 1 |
DATA |
Serial Data Output |
| 2 |
CLK |
Clock Input |
| 3 |
RESET/OE |
Reset/Output Enable |
| 4 |
GND |
Ground |
| 5 |
CEO |
Chip Enable Output (for cascading) |
| 6 |
CE |
Chip Enable Input |
| 7 |
NC |
No Connection |
| 8 |
VCC |
Power Supply (5V) |
XC17256EPD8I Operating Conditions
Recommended Operating Parameters
| Parameter |
Minimum |
Typical |
Maximum |
Unit |
| Supply Voltage (VCC) |
4.5 |
5.0 |
5.5 |
V |
| Operating Temperature |
-40 |
25 |
+85 |
°C |
| Clock Frequency |
DC |
– |
15 |
MHz |
| Input Voltage (VIH) |
2.0 |
– |
VCC+0.5 |
V |
| Input Voltage (VIL) |
-0.5 |
– |
0.8 |
V |
XC17256EPD8I Applications
The XC17256EPD8I serial configuration PROM is ideal for numerous applications requiring reliable FPGA configuration storage:
Industrial Automation Systems
Industrial control systems benefit from the XC17256EPD8I’s extended temperature range (-40°C to +85°C), ensuring reliable operation in harsh manufacturing environments.
Telecommunications Equipment
Network equipment and communication devices utilize the XC17256EPD8I for storing FPGA configurations that handle signal processing and data routing functions.
Aerospace and Defense
The industrial-grade specifications make the XC17256EPD8I suitable for avionics and defense applications where reliability is paramount.
Medical Devices
Medical imaging and diagnostic equipment employ this configuration PROM for storing FPGA bitstreams that control critical device functions.
Test and Measurement Equipment
Laboratory instruments and testing devices use the XC17256EPD8I for reliable FPGA configuration in precision measurement applications.
XC17256EPD8I Part Number Decoder
Understanding the XC17256EPD8I part number helps identify specific device characteristics:
| Code Segment |
Meaning |
| XC17 |
Xilinx Configuration PROM Family |
| 256 |
Memory Density (256Kb) |
| E |
Extended Voltage Range (5V) |
| PD |
Plastic DIP Package |
| 8 |
8-Pin Configuration |
| I |
Industrial Temperature (-40°C to +85°C) |
XC17256EPD8I vs Similar Configuration PROMs
| Part Number |
Memory Size |
Package |
Temp Range |
Voltage |
| XC17256EPD8I |
256Kb |
8-PDIP |
-40°C to +85°C |
5V |
| XC17256EPD8C |
256Kb |
8-PDIP |
0°C to +70°C |
5V |
| XC17256EVO8I |
256Kb |
8-SOIC |
-40°C to +85°C |
5V |
| XC17128EPD8I |
128Kb |
8-PDIP |
-40°C to +85°C |
5V |
| XC17512EPD8I |
512Kb |
8-PDIP |
-40°C to +85°C |
5V |
Programming the XC17256EPD8I
Compatible Programming Tools
The XC17256EPD8I can be programmed using:
- Xilinx iMPACT Programming Software
- Third-party PROM programmers supporting JEDEC standard
- Compatible device programmers from Data I/O, BP Microsystems, and others
Programming File Format
The Xilinx ISE or Vivado design software generates programming files in standard formats:
- PROM files (.mcs, .exo)
- JEDEC files (.jed)
- Intel HEX format
Design Considerations for XC17256EPD8I
Power Supply Requirements
Ensure a stable 5V power supply with appropriate decoupling capacitors (0.1µF ceramic recommended) placed close to the VCC and GND pins.
PCB Layout Guidelines
- Keep clock traces short and away from noise sources
- Maintain proper ground plane underneath the device
- Use standard through-hole pad dimensions for 8-pin PDIP
Cascading Multiple Devices
When cascading multiple XC17256EPD8I devices:
- Connect CEO of the first device to CE of the next device
- Parallel all CLK inputs
- Connect DATA outputs in a daisy-chain configuration
XC17256EPD8I Quality and Compliance
| Standard |
Status |
| Lead-Free |
Contact manufacturer for RoHS-compliant alternatives |
| Moisture Sensitivity Level |
MSL 1 (Unlimited floor life) |
| Quality Certification |
ISO 9001 manufacturing |
| ESD Protection |
Class 1C (HBM) |
How to Order XC17256EPD8I
When ordering the XC17256EPD8I, specify:
- Complete part number: XC17256EPD8I
- Quantity required
- Packaging preference (tube or tape-and-reel if available)
- Required certifications or documentation
XC17256EPD8I Summary
The XC17256EPD8I is a reliable 256Kb serial configuration PROM designed for storing Xilinx FPGA bitstreams. Its industrial temperature rating, simple interface, and cascadable architecture make it suitable for demanding applications across multiple industries. The 8-pin PDIP package enables straightforward through-hole mounting, while the 5V operation ensures compatibility with standard logic levels.
For engineers designing FPGA-based systems requiring robust configuration storage, the XC17256EPD8I delivers proven performance backed by AMD’s extensive experience in programmable logic solutions.
