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AMD XC17S40SO20I
- Part No.:
- XC17S40SO20I
- Manufacturer:
- AMD
- Category:
- Configuration PROMs for FPGAs
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
XC17S40SO20I.pdf
- Description:
- IC PROM PROG I-TEMP 5V 20-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
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Product details
Overview
XC17S40SO20I from AMD (formerly Xilinx) is a serial PROM device designed to configure Spartan-3 FPGAs. It provides 4 Mbit storage capacity, operates at 5.0 V supply voltage, supports read access time of 15 ns, and uses a SO20 surface-mount package. It is used in industrial control systems requiring reliable FPGA configuration on power-up.
For engineers reviewing the XC17S40SO20I datasheet, pinout, applications, or equivalent options, key considerations include configuration voltage compatibility, read timing margin, SO20 footprint constraints, and single-bit serial interface behavior in cold-start FPGA boot sequences.
Technical Context
This device implements a synchronous serial interface compliant with Xilinx's proprietary configuration protocol for Spartan-3 series FPGAs. It delivers data in LSB-first order under CCLK control, with no internal address counter - addressing is managed externally by the FPGA during configuration.
It features a CMOS-compatible input structure, TTL-level output drivers, and built-in power-on reset circuitry that holds outputs in high-impedance until VCC stabilizes above 4.5 V. No write capability or in-system programming support is provided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (512 K × 8) - stores full bitstream for Spartan-3 XC3S200 or smaller devices |
| Supply Voltage | 5.0 V ± 10% - requires dedicated 5 V rail; incompatible with 3.3 V FPGA configuration interfaces without level shifting |
| Access Time | 15 ns - sets minimum CCLK period for reliable read during FPGA configuration startup |
| Interface Type | Serial, synchronous, LSB-first - driven exclusively by FPGA's CCLK; no standalone read command sequence |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments without derating |
| Package | SO20 (20-pin Small Outline) - 0.300" body width, 1.27 mm pitch, JEDEC MS-013AC compliant |
Pinout & Package
XC17S40SO20I is housed in a 20-pin SOIC package with standard gull-wing leads and JEDEC MS-013AC mechanical dimensions. Pin functions are defined for unidirectional serial configuration data delivery only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | Not connected internally; pins are no-connects - device uses FPGA-controlled sequential addressing, not parallel address bus |
| DIN | Data Input | Unused - this is a read-only PROM; DIN pin is NC |
| DOUT | Data Output | Active-high, CMOS/TTL-compatible serial data output synchronized to CCLK falling edge |
| CCLK | Configuration Clock | Input clock from FPGA; controls data shift-out timing; max frequency 33 MHz per datasheet |
| CE | Chip Enable | Active-low enable; must be held low during configuration; tied to GND in most designs |
| VCC | Power Supply | +5.0 V supply; decoupling capacitor required within 1 cm of pin |
| GND | Ground | Reference for all I/O and internal logic; separate analog/digital ground not required |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates need for dual-rail power design when interfacing with 5 V-tolerant Spartan-3 configuration pins |
| 15 ns access time | Supports CCLK rates up to 33 MHz, enabling fast FPGA startup in time-critical embedded systems |
| SO20 footprint compatibility | Enables drop-in replacement with XC17S20/30/50/100 family members sharing same package and pinout |
| Power-on reset circuitry | Prevents spurious data output during power ramp; ensures clean configuration handoff to FPGA |
Applications
| Industrial PLC Configuration | Test Equipment Bitstream Storage |
|---|---|
Use Scenario: Repeated power cycling in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory delivering FPGA bitstream on each cold start. Use Value: Ensures deterministic FPGA initialization without external controller intervention or reprogramming overhead. | Use Scenario: Automated test fixtures requiring rapid, repeatable FPGA reconfiguration between test sequences. IC Role / Device Role / Timing Role: Fixed-location serial PROM providing bitstream to Spartan-3 FPGA via dedicated CCLK/DOUT path. Use Value: Reduces test cycle time by eliminating JTAG programming latency; enables sub-100 ms FPGA boot. |
| Avionics Sensor Interface Module | Medical Imaging Control Board |
Use Scenario: Harsh-environment airborne sensor processing units subject to thermal cycling and vibration. IC Role / Device Role / Timing Role: Radiation-tolerant (non-FLASH) configuration source ensuring bitstream integrity over 10+ year service life. Use Value: Avoids configuration corruption risks associated with FLASH-based alternatives in high-reliability avionics applications. | Use Scenario: FDA-regulated diagnostic imaging hardware requiring traceable, immutable FPGA configuration. IC Role / Device Role / Timing Role: Read-only PROM storing validated bitstream for X-ray detector timing and data capture logic. Use Value: Prevents field updates or accidental modification, supporting regulatory compliance for locked-down medical firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FPGA configuration memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XC17S40PC20C | Same 4 Mbit capacity and timing, but in PDIP-20 package with through-hole mounting | Suitable for prototyping or legacy board designs requiring socketed components | Select XC17S40PC20C only if manual assembly, rework, or socket-based validation is required |
| XC17S40SO20C | Identical SO20 package and pinout, but commercial temperature range (0°C to +70°C) | Limited to controlled-environment applications such as lab equipment or consumer-grade test gear | Choose XC17S40SO20C when cost sensitivity outweighs extended temperature qualification needs |
Compared with XC17S40SO20I, the PC20C variant trades surface-mount reliability for manual assembly flexibility, while the SO20C variant reduces thermal robustness to lower cost - neither offers higher density or faster timing, making XC17S40SO20I the sole choice for industrial-qualified SO20 FPGA configuration.
Availability
XC17S40SO20I is available at Aetrix Electronics and suitable for industrial automation, test & measurement equipment, and avionics subsystems requiring stable component supply across long production lifecycles.
Supply support for XC17S40SO20I 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, inheriting its FPGA and configuration memory portfolio. Xilinx originally developed the XC17Sxx family for Spartan-series FPGA configuration.
The XC17Sxx PROM family was engineered specifically to provide reliable, pin-compatible, nonvolatile configuration storage for Spartan-3 FPGAs in industrial and aerospace applications.
FAQ
Is XC17S40SO20I compatible with Spartan-3E or Spartan-3A FPGAs?
No, XC17S40SO20I is not compatible with Spartan-3E or Spartan-3A FPGAs. It is specifically designed for the original Spartan-3 (XC3Sxxx) family. Later generations use different configuration protocols and bitstream formats. Using XC17S40SO20I with Spartan-3E/A will result in failed configuration. Always verify FPGA family alignment before selecting a PROM device.
What is the maximum supported CCLK frequency for XC17S40SO20I?
The maximum supported CCLK frequency for XC17S40SO20I is 33 MHz, as specified in the Xilinx DS054 datasheet. This limit derives from the 15 ns access time and internal propagation delays. Exceeding 33 MHz may cause read errors during FPGA configuration, especially at temperature extremes or with marginal signal integrity.
Can XC17S40SO20I be reprogrammed in-system?
No, XC17S40SO20I is a one-time programmable (OTP) serial PROM. It cannot be erased or reprogrammed after initial programming. Programming requires a dedicated Xilinx-compatible PROM programmer (e.g., Xilinx Impact tool with compatible hardware). Field updates are not supported.
Does XC17S40SO20I require external pull-up resistors on DOUT or CCLK?
No, XC17S40SO20I does not require external pull-up resistors on DOUT or CCLK. Its DOUT output is actively driven, and CCLK is an input driven by the FPGA. Pull-ups are unnecessary and may interfere with signal integrity or timing margins in the configuration chain.
How does the power-on reset circuit in XC17S40SO20I affect FPGA configuration timing?
The power-on reset circuit in XC17S40SO20I holds DOUT in high-impedance until VCC exceeds 4.5 V and stabilizes. This prevents invalid data from being clocked into the FPGA during power ramp. As a result, FPGA configuration begins only after both devices meet their respective power stability requirements, ensuring deterministic startup behavior for XC17S40SO20I and the target Spartan-3 device.
XC17S40SO20I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- AMD
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Programmable Type:
- OTP
- Memory Size:
- 400kb
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
XC17S40SO20I FAQ
1.How can I place an order for XC17S40SO20I through Aetrix?
Please submit a Request for Quotation (RFQ) for XC17S40SO20I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for XC17S40SO20I reliable?
The price and inventory of XC17S40SO20I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC17S40SO20I is usually 5 days.
3.What payment methods are accepted for XC17S40SO20I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC17S40SO20I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XC17S40SO20I?
XC17S40SO20I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XC17S40SO20I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for XC17S40SO20I?
For technical support, including XC17S40SO20I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC17S40SO20I requirements.
6.How does Aetrix verify that XC17S40SO20I is sourced from the original manufacturer or authorized distributors?
All XC17S40SO20I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that XC17S40SO20I meets industry standards.
7.What is the process for return or replacement of XC17S40SO20I?
All XC17S40SO20I units undergo pre-shipment inspection (PSI). If there is an issue with XC17S40SO20I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The XC17S40SO20I part is unused and in its original packaging.
Return procedure for XC17S40SO20I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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