The XC17S20XLPD8C is a high-reliability One-Time Programmable (OTP) Serial Configuration PROM manufactured by Xilinx (now AMD). This 174Kbit configuration memory IC is engineered specifically for storing bitstreams used to configure Spartan and Spartan-XL FPGA devices. Featuring a compact 8-pin PDIP package and 3.3V low-voltage operation, the XC17S20XLPD8C delivers an industry-proven solution for embedded systems, industrial automation, telecommunications, and consumer electronics applications.
XC17S20XLPD8C Key Features and Benefits
High-Performance Configuration Memory
The XC17S20XLPD8C serial PROM provides designers with several compelling advantages for Xilinx FPGA configuration applications:
- OTP Programming Reliability: One-time programmable architecture ensures permanent bitstream storage with excellent data retention exceeding 20 years
- Low-Voltage 3.3V Operation: Reduced power consumption ideal for battery-powered and portable applications
- Compact 8-Pin PDIP Package: Through-hole mounting simplifies prototyping and manufacturing processes
- Commercial Temperature Support: Operates reliably from 0°C to +70°C for standard commercial environments
- Simple Single-Wire Interface: Requires only one user I/O pin for FPGA connection
- Programmable Reset Polarity: Supports both active-high and active-low reset configurations
Seamless Spartan FPGA Integration
When paired with Spartan or Spartan-XL FPGAs in Master Serial mode, the XC17S20XLPD8C automatically delivers configuration data. The FPGA generates clock pulses, and the PROM outputs bitstream data with minimal access time delay. This self-contained configuration approach eliminates external microprocessor requirements.
XC17S20XLPD8C Technical Specifications
Electrical Characteristics
| Parameter |
Specification |
| Memory Type |
OTP Serial PROM |
| Memory Density |
174Kbit (20K System Gates Support) |
| Supply Voltage (VCC) |
3.0V to 3.6V |
| Typical Operating Voltage |
3.3V |
| Standby Current (ISB) |
5µA (Typical) |
| Operating Current (ICC) |
10mA (Maximum) |
| Data Retention |
>20 Years |
Operating Conditions
| Parameter |
Minimum |
Maximum |
| Operating Temperature |
0°C |
+70°C |
| Storage Temperature |
-65°C |
+150°C |
| Supply Voltage |
3.0V |
3.6V |
| Clock Frequency |
DC |
10MHz |
Package Information
| Attribute |
Value |
| Package Type |
PDIP (Plastic Dual In-Line Package) |
| Pin Count |
8 |
| Package Code |
PD8 |
| Mounting Type |
Through-Hole |
| RoHS Compliance |
Yes |
| Lead-Free Status |
Lead-Free |
XC17S20XLPD8C Part Number Decoder
Understanding the complete part number structure helps ensure correct component selection:
| Code Segment |
Meaning |
| XC17S |
Xilinx Configuration PROM for Spartan Family |
| 20 |
20,000 System Gate Logic Support |
| XL |
Extended Low-Voltage (3.3V) Version |
| PD |
PDIP Package Type |
| 8 |
8-Pin Configuration |
| C |
Commercial Temperature Range (0°C to +70°C) |
Related Part Numbers in XC17S20XL Family
| Part Number |
Package |
Temperature Range |
| XC17S20XLPD8C |
8-PDIP |
Commercial (0°C to +70°C) |
| XC17S20XLPD8I |
8-PDIP |
Industrial (-40°C to +85°C) |
| XC17S20XLVO8C |
8-SOIC |
Commercial (0°C to +70°C) |
| XC17S20XLVO8I |
8-SOIC |
Industrial (-40°C to +85°C) |
XC17S20XLPD8C Pin Configuration
8-Pin PDIP Pinout Diagram
| Pin Number |
Pin Name |
I/O |
Description |
| 1 |
VPP |
Input |
Programming Voltage (3.3V during normal operation) |
| 2 |
CLK |
Input |
Clock Input |
| 3 |
DATA |
Output |
Serial Data Output |
| 4 |
GND |
Power |
Ground |
| 5 |
CE |
Input |
Chip Enable (Active Low) |
| 6 |
CEO |
Output |
Chip Enable Output (for daisy-chaining) |
| 7 |
RESET/OE |
Input |
Reset/Output Enable |
| 8 |
VCC |
Power |
Supply Voltage (3.3V) |
XC17S20XLPD8C Configuration Modes
Master Serial Mode Operation
In Master Serial configuration mode, the Spartan FPGA generates the configuration clock signal that drives the XC17S20XLPD8C PROM. After each rising clock edge, valid data appears on the DATA output pin within the specified access time. The FPGA continues generating clock pulses until configuration completes, then automatically disables the PROM.
Slave Serial Mode Operation
When operating in Slave Serial mode, both the PROM and the target FPGA receive clock signals from an external source. This configuration approach supports more complex system architectures requiring centralized timing control.
PROM Cascading for Larger Designs
Multiple XC17S20XLPD8C devices can be cascaded using the CEO (Chip Enable Output) pin to configure larger FPGA designs exceeding single-PROM capacity. The CEO signal automatically enables the next device in the chain after the current PROM completes data output.
XC17S20XLPD8C Target Applications
Industrial and Embedded Systems
- Industrial Automation Controllers: Reliable FPGA configuration for PLC and motion control systems
- Process Control Equipment: Stable operation in factory floor environments
- Building Automation Systems: HVAC control and security system implementations
Communications and Networking
- Network Interface Cards: Configuration storage for network processing FPGAs
- Telecommunications Equipment: Base station and switching infrastructure
- Protocol Converters: Industrial gateway and bridge applications
Consumer and Commercial Electronics
- Display Controllers: Video processing and display interface applications
- Audio Processing Equipment: Professional audio system implementations
- Test and Measurement Instruments: Laboratory equipment configuration
Automotive and Transportation
- Infotainment Systems: Dashboard display and audio system controllers
- Body Electronics Modules: Lighting and comfort system control
- Diagnostic Equipment: Vehicle testing and analysis systems
Programming the XC17S20XLPD8C
Supported Programming Tools
The XC17S20XLPD8C supports programming through industry-standard PROM programmers compatible with Xilinx devices. The configuration bitstream is generated using Xilinx ISE Design Suite or Alliance development systems, which compile the FPGA design into standard HEX format.
Programming Specifications
| Parameter |
Value |
| Programming Voltage (VPP) |
12.25V |
| Programming Time |
<2 seconds typical |
| Data Format |
Intel HEX / MCS |
| Verification |
Automatic margin verify |
Recommended Programming Equipment
- Data I/O programmers
- BP Microsystems programmers
- Xeltek programmers
- Xilinx Cable platforms
Design Considerations for XC17S20XLPD8C
Power Supply Requirements
- Implement proper 3.3V regulation with ±10% tolerance
- Add 0.1µF decoupling capacitor between VCC and GND pins
- Ensure clean power-on reset sequencing
PCB Layout Guidelines
- Position PROM close to target FPGA to minimize trace lengths
- Use controlled impedance routing for clock and data signals
- Provide adequate ground plane coverage under the device
System Integration Tips
- Verify reset polarity programming matches system requirements
- Consider adding test points for configuration debugging
- Implement configuration status monitoring where applicable
XC17S20XLPD8C vs Alternative Configuration Solutions
Comparison with In-System Programmable PROMs
| Feature |
XC17S20XLPD8C (OTP) |
XC18V Series (ISP) |
| Reprogrammability |
No |
Yes |
| Unit Cost |
Lower |
Higher |
| Programming Infrastructure |
Standard programmer |
JTAG interface |
| Field Updates |
Not supported |
Supported |
| Security |
High (OTP) |
Moderate |
When to Choose the XC17S20XLPD8C
The XC17S20XLPD8C OTP PROM is ideal when:
- Design is finalized and field updates are unnecessary
- Lower BOM cost is prioritized over reprogrammability
- Enhanced configuration security is required
- Standard PROM programming infrastructure is available
Ordering Information
XC17S20XLPD8C Availability
| Parameter |
Details |
| Manufacturer |
AMD (formerly Xilinx) |
| Part Status |
Active |
| Standard Lead Time |
Contact distributor |
| Minimum Order Quantity |
Varies by distributor |
| Packaging Options |
Tube, Tray |
Quality and Compliance
- RoHS Compliant: Yes
- Lead-Free: Yes
- MSL Rating: Level 1 (unlimited floor life at ≤30°C/85% RH)
- REACH Compliant: Yes
Frequently Asked Questions About XC17S20XLPD8C
What FPGAs are compatible with the XC17S20XLPD8C?
The XC17S20XLPD8C is designed specifically for configuring Spartan and Spartan-XL family FPGAs with configuration bitstreams up to 174Kbit in size.
Can the XC17S20XLPD8C be reprogrammed?
No, the XC17S20XLPD8C is a one-time programmable (OTP) device. Once programmed, the configuration data is permanent. For applications requiring field updates, consider the XC18V series of in-system programmable configuration PROMs.
What is the difference between XC17S20XLPD8C and XC17S20PD8C?
The “XL” designation indicates 3.3V low-voltage operation, while devices without “XL” operate at 5V. Always verify voltage compatibility with your target FPGA.
How many XC17S20XLPD8C devices can be daisy-chained?
Multiple devices can be cascaded using the CEO pin. The maximum chain length depends on the total configuration bitstream size of your target FPGA design.
Summary
The XC17S20XLPD8C remains a reliable and cost-effective configuration memory solution for Spartan and Spartan-XL FPGA designs. Its combination of 174Kbit OTP storage, 3.3V low-voltage operation, simple 8-pin PDIP package, and commercial temperature rating makes it suitable for a wide range of embedded, industrial, and consumer applications requiring permanent, secure FPGA configuration storage.
For current pricing, availability, and technical documentation, contact your authorized electronic components distributor or visit the manufacturer’s product page.
