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Home > Products > Integrated Circuits (ICs) > Memory > Configuration PROMs for FPGAs

AMD XC18V512VQ44I

Name: XC18V512VQ44I
Brand: AMD
SKU: XC18V512VQ44I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: XC18V512VQ44I

Manufacturer:: AMD

Category:: Configuration PROMs for FPGAs

Package:: 44-TQFP

Datasheet:: XC18V512VQ44I.pdf

Description:: IC PROM SER I-TEMP 3.3V 44-VQFP

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Product details

Overview

XC18V512VQ44I from Xilinx is a 512-kilobit in-system programmable configuration PROM designed to store and serially/parallel load bitstreams into Xilinx FPGAs. It operates at 3.3V or 2.5V I/O, supports IEEE 1149.1 JTAG boundary-scan, endures 20,000 program/erase cycles, and functions across –40°C to +85°C industrial temperature range - enabling reliable FPGA reconfiguration in embedded control and test systems.

For engineers reviewing the XC18V512VQ44I datasheet, pinout, applications, or equivalent options, key selection criteria include dual-mode (serial/parallel) configuration support, 5V-tolerant I/O compatibility with legacy interfaces, cascading capability via CEO/CE chaining, and JTAG-initiated FPGA reset via CF pin - all critical for FPGA-based system boot integrity and field-upgradeability.

Technical Context

The XC18V512VQ44I implements a flash-based nonvolatile memory architecture with dedicated serial (D0-only) and parallel (D0–D7) output paths, selectable via JTAG-accessible control register. Its internal address counter advances on rising CLK edges when CE is low and OE/RESET is high, enabling deterministic timing alignment with FPGA CCLK in Master Serial or Slave-SelectMAP modes.

JTAG TAP controller supports CONFIG instruction to pulse CF low (300–500 ns), directly triggering FPGA PROGRAM pin reset and configuration restart without power cycle. Boundary-scan registers provide full pin visibility and high-Z control, while IDCODE 05023093h or 05033093h confirms device identity and family membership per IEEE 1149.1.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory capacity	524,288 bits (512 kbit) - stores full configuration bitstream for Spartan-II, Virtex-E, and early Virtex FPGAs like XC2S15/XC2S30.
Configuration interface	Serial (D0 only, up to 33 MHz) and parallel (D0–D7, up to 264 Mb/s at 33 MHz) - enables flexible FPGA boot modes without redesign.
Operating voltage	VCCINT = 3.3V; VCCO = 3.3V or 2.5V - supports mixed-voltage FPGA I/O banks and backward compatibility with 5V-tolerant inputs.
Endurance & retention	20,000 program/erase cycles; ≥20 years data retention - validated for repeated firmware updates in industrial field-deployed systems.
Temperature range	–40°C to +85°C - qualified for industrial-grade operation without derating or thermal management overhead.
JTAG compliance	Fully compliant with IEEE Std 1149.1 - enables in-system programming, boundary-scan testing, and CONFIG-triggered FPGA reconfiguration via standard debug infrastructure.
Security feature	Read-inhibit security bit - prevents unauthorized JTAG readback of configuration data while permitting erase and reprogram.

Pinout & Package

XC18V512VQ44I is housed in a 44-pin Very Thin Quad Flat Package (VQFP), RoHS-compliant, with 0.8 mm pitch and 10 mm × 10 mm body size. Pin 1 is marked by top-side dot; package includes 4 ground pins (pins 6, 18, 28, 41) and dual VCCO supply pins (pins 8, 16, 26, 36) for noise isolation.

Pin/Terminal	Circuit Role	Design Meaning
D0	Serial data output	Drives FPGA DIN in Master Serial mode; active only when CE=Low, OE/RESET=High, and serial mode selected.
D1–D7	Parallel data outputs	Drive FPGA D[0:7] in Slave-Parallel/SelectMAP mode; tri-stated in serial mode - may be left unconnected.
CLK	Configuration clock input	Accepts FPGA-generated CCLK (Master modes) or external oscillator (Slave modes); increments address counter on rising edge.
OE/RESET	Bidirectional open-drain reset	Held Low during power-up reset; drives FPGA INIT pin; polarity fixed - no software programmability.
CE	Chip enable input	High = standby (address reset, outputs high-Z); used with FPGA DONE to minimize post-configuration current draw.
CEO	Cascade enable output	Pulses Low after terminal count reached; drives CE of next PROM in daisy chain - enables >512 kbit bitstream storage.
CF	Configuration trigger output	Open-drain output pulsed Low (300–500 ns) by JTAG CONFIG instruction - directly resets FPGA PROGRAM pin.
TCK/TMS/TDI/TDO	JTAG Test Access Port	Standard 4-wire interface for ISP programming, verification, IDCODE read, and boundary-scan diagnostics.
VCCINT	Core logic supply	3.3V supply for internal flash and control logic; pins 17, 35, 38 are connected internally - all must be decoupled.
VCCO	I/O buffer supply	3.3V or 2.5V supply for D0–D7, OE/RESET, CEO, CF - sets output voltage level and input threshold for interfacing.

Key Features

Feature	Design Value
In-system programmability	Enables field firmware updates via standard JTAG cable without removing device from PCB - eliminates socket wear and rework delays.
Dual configuration modes	Single-bit serial (low pin count) and byte-wide parallel (high-speed loading) modes selectable via JTAG - adapts to FPGA architecture and board layout constraints.
5V-tolerant I/O	Accepts 5V, 3.3V, and 2.5V signals on D0–D7, CLK, CE, OE/RESET - simplifies integration with mixed-voltage legacy systems and level-shifter elimination.
Cascadable architecture	CEO-to-CE daisy-chaining allows stacking multiple XC18V512VQ44I devices to support FPGAs requiring >512 kbit configuration (e.g., XC2VP20).
JTAG-initiated FPGA reset	CF pin driven by CONFIG instruction provides hardware-synchronized FPGA reconfiguration - avoids race conditions in hot-swap or watchdog recovery scenarios.

Applications

Industrial PLC Configuration Storage	Aerospace Avionics Boot Loader
Use Scenario: Storing FPGA configuration for motion control logic in programmable logic controllers operating in harsh factory environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, single-event-upset-resistant boot image storage and serial delivery to Spartan-II FPGA on power-up or INIT assertion. Use Value: Eliminates external microcontroller boot loader; leverages industrial temperature rating (–40°C to +85°C) and 20,000-cycle endurance for 10+ year field service life without bitstream corruption.	Use Scenario: Loading verified configuration bitstreams into radiation-tolerant Virtex-E FPGAs used in satellite payload controllers where reprogramming must occur in-orbit without physical access. IC Role / Device Role / Timing Role: JTAG-programmable PROM acting as secure, cascade-capable configuration source with CF-triggered FPGA reset for fault-recovery sequences. Use Value: Read-inhibit security prevents unauthorized bitstream extraction; IEEE 1149.1 compliance enables remote ISP via spacecraft telemetry link - no hardware modification required.
Automated Test Equipment (ATE) Calibration Memory	Medical Imaging FPGA Initialization
Use Scenario: Holding calibration coefficients and test pattern definitions for high-speed digital pattern generators using Virtex-II FPGAs in semiconductor wafer probers. IC Role / Device Role / Timing Role: Parallel-mode PROM delivering 264 Mb/s configuration data to meet tight FPGA startup timing budgets (<50 ms) during automated test sequence transitions. Use Value: Dual VCCO supply (3.3V/2.5V) matches FPGA I/O bank requirements; CEO chaining supports multi-FPGA synchronization without additional logic.	Use Scenario: Providing fail-safe FPGA configuration for real-time image processing pipelines in MRI and CT scanner subsystems requiring zero-downtime reliability and regulatory traceability. IC Role / Device Role / Timing Role: Industrial-grade PROM storing encrypted bitstreams loaded via Master Serial mode, with OE/RESET tied to FPGA INIT for deterministic power-on initialization. Use Value: 20-year data retention ensures bitstream integrity over equipment lifetime; –40°C to +85°C rating accommodates medical cabinet thermal profiles without derating.

Industrial PLC Configuration Storage

Aerospace Avionics Boot Loader

Use Scenario: Storing FPGA configuration for motion control logic in programmable logic controllers operating in harsh factory environments with wide temperature swings and EMI exposure.

IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, single-event-upset-resistant boot image storage and serial delivery to Spartan-II FPGA on power-up or INIT assertion.

Use Value: Eliminates external microcontroller boot loader; leverages industrial temperature rating (–40°C to +85°C) and 20,000-cycle endurance for 10+ year field service life without bitstream corruption.

Use Scenario: Loading verified configuration bitstreams into radiation-tolerant Virtex-E FPGAs used in satellite payload controllers where reprogramming must occur in-orbit without physical access.

IC Role / Device Role / Timing Role: JTAG-programmable PROM acting as secure, cascade-capable configuration source with CF-triggered FPGA reset for fault-recovery sequences.

Use Value: Read-inhibit security prevents unauthorized bitstream extraction; IEEE 1149.1 compliance enables remote ISP via spacecraft telemetry link - no hardware modification required.

Automated Test Equipment (ATE) Calibration Memory

Medical Imaging FPGA Initialization

Use Scenario: Holding calibration coefficients and test pattern definitions for high-speed digital pattern generators using Virtex-II FPGAs in semiconductor wafer probers.

IC Role / Device Role / Timing Role: Parallel-mode PROM delivering 264 Mb/s configuration data to meet tight FPGA startup timing budgets (<50 ms) during automated test sequence transitions.

Use Value: Dual VCCO supply (3.3V/2.5V) matches FPGA I/O bank requirements; CEO chaining supports multi-FPGA synchronization without additional logic.

Use Scenario: Providing fail-safe FPGA configuration for real-time image processing pipelines in MRI and CT scanner subsystems requiring zero-downtime reliability and regulatory traceability.

IC Role / Device Role / Timing Role: Industrial-grade PROM storing encrypted bitstreams loaded via Master Serial mode, with OE/RESET tied to FPGA INIT for deterministic power-on initialization.

Use Value: 20-year data retention ensures bitstream integrity over equipment lifetime; –40°C to +85°C rating accommodates medical cabinet thermal profiles without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XC18V512PC44I	Same 512 kbit capacity and electrical specs, but in 44-pin plastic leaded chip carrier (PLCC) package - larger footprint, through-hole mountable.	Preferred for prototyping or legacy through-hole boards; lacks VQFP's thermal performance and space efficiency.	Select XC18V512PC44I only when PLCC socket compatibility or manual rework is required; XC18V512VQ44I is optimal for surface-mount production.
XC17S10PC20C	One-time programmable (OTP) 1 Mbit PROM in 20-pin SOIC; no JTAG, no reprogrammability, no CF pin, no security bit.	Suitable only for fixed, unchanging configurations where field updates are unnecessary and cost is primary.	Choose XC17S10PC20C only for cost-sensitive, static designs; XC18V512VQ44I is mandatory for reprogrammable, secure, or JTAG-managed systems.

Compared with XC18V512PC44I, XC18V512VQ44I offers superior thermal dissipation and board density; compared with XC17S10PC20C, it delivers full in-system reprogrammability, JTAG security, and FPGA reset control - making it the only viable choice for upgradable, certified, or maintenance-intensive applications.

Availability

XC18V512VQ44I is available at Aetrix Electronics and suitable for industrial control, aerospace avionics, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed authenticity.

Supply support for XC18V512VQ44I 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

Xilinx, now part of AMD, is a pioneer in programmable logic and FPGA technology, specializing in high-performance adaptive computing solutions for aerospace, industrial, and communications markets.

The XC18V00 series was engineered specifically to provide robust, reprogrammable configuration storage for Xilinx FPGAs - addressing needs in field-upgradable systems, secure boot, and JTAG-integrated test infrastructure.

FAQ

What is the function of the CF pin on the XC18V512VQ44I?

The CF (Configuration) pin on the XC18V512VQ44I is an open-drain output that pulses Low for 300–500 ns when the JTAG CONFIG instruction is executed. This signal connects directly to the FPGA's PROGRAM pin to initiate a hardware reset and reload the configuration bitstream. The CF pin is not present on 20-pin packages but is fully functional on the VQ44 variant, enabling synchronized, software-triggered FPGA reconfiguration without power cycling. XC18V512VQ44I relies on this pin for reliable in-field updates and watchdog recovery sequences.

Does the XC18V512VQ44I support both serial and parallel configuration modes?

Yes, the XC18V512VQ44I supports dual configuration modes: serial (using D0 only, up to 33 MHz) and parallel (using D0–D7, up to 264 Mb/s at 33 MHz). Mode selection is controlled via a JTAG-accessible user register and configured using Xilinx iMPACT software's "Parallel mode" setting. Serial mode is default; parallel mode requires explicit enablement and proper FPGA mode pin setup (e.g., SelectMAP). XC18V512VQ44I maintains full functionality in both modes, including JTAG ISP and security features.

What is the significance of the IDCODE 05023093h or 05033093h for the XC18V512VQ44I?

The IDCODE values 05023093h and 05033093h uniquely identify the XC18V512VQ44I within the XC18V00 family per IEEE 1149.1. The "30" in the third byte indicates the 512 kbit capacity (0x30 = 48 decimal → XC18V512), "50" is the family code, and "49" is Xilinx's company code. These codes allow automated test equipment and iMPACT software to verify correct device presence and version before programming. XC18V512VQ44I uses either IDCODE depending on silicon revision, both fully compatible and functionally identical.

Can the XC18V512VQ44I be used to configure modern Xilinx FPGAs like Artix or Kintex?

No, the XC18V512VQ44I is designed exclusively for legacy Xilinx FPGA families including Spartan-II, Spartan-IIE, Virtex-E, and early Virtex devices (e.g., XC2V40–XC2V1500, XC2VP2–XC2VP70). It does not support 7-series, UltraScale, or newer architectures due to incompatible configuration protocols, bitstream formats, and voltage requirements. XC18V512VQ44I remains valid for maintaining and repairing deployed systems based on these older FPGAs but is not suitable for new designs targeting current-generation Xilinx devices.

How does the CEO pin enable cascading of multiple XC18V512VQ44I devices?

The CEO (Chip Enable Output) pin on the XC18V512VQ44I goes Low after its internal address counter reaches terminal count (TC), signaling completion of its stored bitstream. This Low signal drives the CE (Chip Enable) input of the next XC18V512VQ44I in the chain, enabling its DATA outputs and allowing seamless continuation of configuration data flow. All CLK and DATA lines are wired in parallel across the chain. XC18V512VQ44I supports unlimited daisy-chaining in theory, though practical limits depend on signal integrity and FPGA configuration depth - e.g., two XC18V512VQ44I units support XC2VP20 (8.2 Mbit).

XC18V512VQ44I Specifications

Product attributes: Attribute value

Manufacturer:: AMD

Series:: -

Package/Case:: 44-TQFP

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Programmable Type:: In System Programmable

Memory Size:: 512kb

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Supplier Device Package:: 44-VQFP (10x10)

XC18V512VQ44I FAQ

1.How can I place an order for XC18V512VQ44I through Aetrix?

Please submit a Request for Quotation (RFQ) for XC18V512VQ44I 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 XC18V512VQ44I reliable?

The price and inventory of XC18V512VQ44I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC18V512VQ44I is usually 5 days.

3.What payment methods are accepted for XC18V512VQ44I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC18V512VQ44I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for XC18V512VQ44I?

XC18V512VQ44I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your XC18V512VQ44I 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 XC18V512VQ44I?

For technical support, including XC18V512VQ44I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC18V512VQ44I requirements.

6.How does Aetrix verify that XC18V512VQ44I is sourced from the original manufacturer or authorized distributors?

All XC18V512VQ44I 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 XC18V512VQ44I meets industry standards.

7.What is the process for return or replacement of XC18V512VQ44I?

All XC18V512VQ44I units undergo pre-shipment inspection (PSI). If there is an issue with XC18V512VQ44I, 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 XC18V512VQ44I part is unused and in its original packaging.

Return procedure for XC18V512VQ44I:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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