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

AMD XC18V04VQ44I

Name: XC18V04VQ44I
Brand: AMD
SKU: XC18V04VQ44I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: XC18V04VQ44I

Manufacturer:: AMD

Category:: Configuration PROMs for FPGAs

Package:: 44-TQFP

Datasheet:: XC18V04VQ44I.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

XC18V04VQ44I from Xilinx is a 4-Mbit in-system programmable configuration PROM for Xilinx FPGAs, operating at 3.3V with industrial temperature range (–40°C to +85°C), supporting both serial (up to 33 MHz) and parallel (up to 264 Mb/s) configuration modes, and featuring IEEE 1149.1 JTAG boundary-scan for programming and verification in embedded FPGA systems.

For engineers reviewing the XC18V04VQ44I datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (VQ44), confirmed dual-mode interface timing, JTAG-initiated FPGA reconfiguration via CF pin, and cascading support for multi-FPGA bitstream storage - all critical for FPGA-based industrial control, telecom infrastructure, and reconfigurable computing designs.

Technical Context

The XC18V04VQ44I implements a flash-based nonvolatile memory architecture with dual-configuration logic enabling Master Serial, Slave Serial, Master-SelectMAP, and Slave-Parallel/SelectMAP modes. Its internal address counter increments on each rising CLK edge when CE is low and OE/RESET is high, delivering data synchronously to FPGA DIN or D[0:7] pins.

JTAG TAP controller supports CONFIG instruction to pulse CF low (300–500 ns) for FPGA reset and configuration initiation, while IDCODE register (05026093h / 05036093h) and USERCODE register provide device identification and user-defined metadata. Boundary-scan register enables EXTEST, SAMPLE/PRELOAD, and CLAMP operations with dedicated output enable and high-Z control stages per pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Capacity	4,194,304 bits (4 Mbit) - stores full configuration bitstream for Xilinx Virtex-II XC2V1000 (4.08 Mbit) or Spartan-3 XC3S1000 (3.22 Mbit) without external compression.
Configuration Interface	Serial (D0 only) or Parallel (D0–D7) - selectable via JTAG-accessible control register; default is serial mode.
Max Serial Clock Rate	33 MHz - enables sub-130 ms configuration time for 4-Mbit bitstream (127 ms at 33 MHz, no overhead).
Max Parallel Throughput	264 Mb/s at 33 MHz - achieves byte-wide transfer (33 MB/s), reducing configuration latency by ~8× vs. serial mode.
Endurance & Retention	20,000 program/erase cycles and 20-year data retention - validated across full industrial voltage/temperature range (–40°C to +85°C).
I/O Voltage Tolerance	5V-tolerant inputs - accepts 5V, 3.3V, or 2.5V signals on D0–D7, CLK, CE, OE/RESET, TMS, TCK, TDI, TDO, CEO, CF pins.
Output Drive Capability	3.3V or 2.5V output - VCCO supplies output drivers; supports mixed-voltage FPGA interfacing without level shifters.

Pinout & Package

VQ44 (44-pin Very Thin Quad Flat Package) with 0.8 mm pitch, 10 mm × 10 mm body, and exposed thermal pad (non-electrical). Pin 1 marked by dot; pins numbered counterclockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
D0	Serial Data Output	Drives FPGA DIN pin in Master/Slave 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	Driven by FPGA CCLK (Master modes) or external oscillator (Slave modes); increments internal address counter on rising edge.
OE/RESET	Output Enable / Asynchronous Reset	Bidirectional open-drain pin; Low resets address counter and forces DATA outputs to high-Z; connected to FPGA INIT pin.
CE	Chip Enable Input	High disables outputs and resets address counter; used for standby power reduction or daisy-chain gating via CEO.
CEO	Cascade Enable Output	Open-drain output pulsed Low when terminal count reached; drives CE of next PROM in chain for seamless bitstream concatenation.
CF	Configuration Initiate Output	Open-drain pin pulsed Low (300–500 ns) by JTAG CONFIG instruction to assert FPGA PROGRAM pin and trigger reconfiguration.
TCK/TMS/TDI/TDO	JTAG Test Access Port	IEEE 1149.1-compliant 4-wire interface for in-system programming, verification, security bit setting, and IDCODE/USERCODE readback.
VCCINT	Core Logic Supply	3.3V supply for internal logic and address counter; pins 17, 35, 38 are bonded in VQ44 package (per DS026 note 3).
VCCO	I/O Buffer Supply	3.3V or 2.5V supply for output drivers and input buffers; pins 8, 16, 26, 36 connect to same net for noise immunity.
GND	Ground Reference	Four dedicated ground pins (6, 18, 28, 41) minimize ground bounce during parallel data bursts and JTAG transitions.

Key Features

Feature	Design Value
In-system programmability via JTAG	Enables field firmware updates without socket removal; supports daisy-chained programming of multiple XC18V04VQ44I devices using standard 4-pin interface.
Dual configuration mode selection	JTAG-accessible control register allows runtime switching between serial and parallel modes - no hardware change required for interface optimization.
JTAG-initiated FPGA configuration	CONFIG instruction pulses CF pin to reset and restart FPGA configuration without power cycle - critical for hot-reconfigurable systems.
Read security bit protection	User-settable JTAG read-inhibit bit prevents unauthorized bitstream extraction; erasure is only method to clear the security lock.
Cascadable architecture	CEO-to-CE chaining enables >4-Mbit storage (e.g., 2× XC18V04VQ44I for XC2VP20's 8.21 Mbit requirement) with automatic handoff at terminal count.

Applications

Industrial PLC Configuration Storage	Telecom Baseband FPGA Reconfiguration
Use Scenario: Storing and loading configuration bitstreams for Xilinx Virtex-II FPGAs in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, repeatable FPGA initialization at power-up or on-demand via OE/RESET assertion. Use Value: Enables reliable cold-start operation across –40°C to +85°C with 20-year data retention, eliminating need for external backup power or refresh circuitry.	Use Scenario: Supporting dynamic partial reconfiguration of Xilinx Spartan-3 FPGAs in wireless baseband processing units requiring rapid bitstream swaps during protocol handover. IC Role / Device Role / Timing Role: Dual-mode PROM delivering parallel configuration data at 264 Mb/s to reduce reconfiguration latency below 16 ms for real-time RF parameter updates. Use Value: Achieves sub-16 ms FPGA reload (vs. >120 ms serial) - meets 3GPP handover timing constraints without sacrificing in-system programmability.
Aerospace Avionics BIT Sequencing	Medical Imaging FPGA Calibration Storage
Use Scenario: Hosting boot-time configuration and built-in test (BIT) bitstreams for radiation-tolerant Xilinx Virtex-E FPGAs in satellite payload controllers. IC Role / Device Role / Timing Role: JTAG-controlled PROM executing CONFIG instruction to initiate FPGA self-test sequences without host processor intervention. Use Value: Eliminates dependency on flight software for BIT execution; CF pin pulse provides hardware-synchronized reset independent of CPU state.	Use Scenario: Storing calibrated configuration profiles for Xilinx Spartan-II FPGAs in MRI gradient controller modules requiring traceable, versioned hardware configurations. IC Role / Device Role / Timing Role: Secure PROM with read-inhibited bitstream protecting proprietary calibration algorithms from reverse engineering during field service. Use Value: Prevents unauthorized access to medical device IP while enabling authorized field updates via JTAG with secure authentication handshake.

Industrial PLC Configuration Storage

Telecom Baseband FPGA Reconfiguration

Use Scenario: Storing and loading configuration bitstreams for Xilinx Virtex-II FPGAs in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, repeatable FPGA initialization at power-up or on-demand via OE/RESET assertion.

Use Value: Enables reliable cold-start operation across –40°C to +85°C with 20-year data retention, eliminating need for external backup power or refresh circuitry.

Use Scenario: Supporting dynamic partial reconfiguration of Xilinx Spartan-3 FPGAs in wireless baseband processing units requiring rapid bitstream swaps during protocol handover.

IC Role / Device Role / Timing Role: Dual-mode PROM delivering parallel configuration data at 264 Mb/s to reduce reconfiguration latency below 16 ms for real-time RF parameter updates.

Use Value: Achieves sub-16 ms FPGA reload (vs. >120 ms serial) - meets 3GPP handover timing constraints without sacrificing in-system programmability.

Aerospace Avionics BIT Sequencing

Medical Imaging FPGA Calibration Storage

Use Scenario: Hosting boot-time configuration and built-in test (BIT) bitstreams for radiation-tolerant Xilinx Virtex-E FPGAs in satellite payload controllers.

IC Role / Device Role / Timing Role: JTAG-controlled PROM executing CONFIG instruction to initiate FPGA self-test sequences without host processor intervention.

Use Value: Eliminates dependency on flight software for BIT execution; CF pin pulse provides hardware-synchronized reset independent of CPU state.

Use Scenario: Storing calibrated configuration profiles for Xilinx Spartan-II FPGAs in MRI gradient controller modules requiring traceable, versioned hardware configurations.

IC Role / Device Role / Timing Role: Secure PROM with read-inhibited bitstream protecting proprietary calibration algorithms from reverse engineering during field service.

Use Value: Prevents unauthorized access to medical device IP while enabling authorized field updates via JTAG with secure authentication handshake.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XC18V04PC44I	Same 4-Mbit capacity and JTAG features, but in 44-pin plastic leaded chip carrier (PC44) package with 1.27 mm pitch and through-hole mounting.	Preferred for legacy PCBs with through-hole footprints or where thermal mass improves reliability under thermal cycling.	Select XC18V04PC44I only when PC44 footprint exists; VQ44 offers superior high-frequency signal integrity and smaller board area.
XC17V04PC44C	One-time programmable (OTP) 4-Mbit PROM in same PC44 package; lacks in-system programmability, JTAG CONFIG, and read security.	Suitable for production units with finalized bitstreams where field update capability is unnecessary and cost minimization is critical.	Choose XC17V04PC44C only for fixed-function deployments; XC18V04VQ44I is mandatory for prototyping, validation, or field-upgradable systems.

Compared with XC18V04PC44I, the XC18V04VQ44I reduces board space by 42% and improves high-speed signal integrity via finer-pitch VQFP routing; versus XC17V04PC44C, it adds full in-system reprogrammability, JTAG-initiated configuration, and bitstream security - essential for development agility and IP protection.

Availability

XC18V04VQ44I is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, aerospace avionics, medical imaging platforms, and reconfigurable computing accelerators requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for XC18V04VQ44I 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, delivering high-performance adaptive computing solutions for aerospace, industrial, and communications markets since 1984.

The XC18V00 series was designed specifically to simplify and harden FPGA configuration in mission-critical systems - emphasizing in-system reprogrammability, JTAG-based security, and robust dual-mode interface support for Virtex and Spartan families.

FAQ

What is the exact memory capacity of the XC18V04VQ44I?

The XC18V04VQ44I contains 4,194,304 bits (4 Mbit) of nonvolatile flash memory, sufficient to store the full configuration bitstream for Xilinx FPGAs such as the XC2V1000 (4.08 Mbit) or XC3S1000 (3.22 Mbit) without compression. This capacity is fixed and cannot be extended via external memory mapping.

Does the XC18V04VQ44I support both serial and parallel configuration modes?

Yes, the XC18V04VQ44I supports dual configuration modes: serial (D0 only, up to 33 MHz) and parallel (D0–D7, up to 264 Mb/s). Mode selection is controlled via a JTAG-accessible user register in the device; serial mode is the factory-default setting.

How does the CF pin function on the XC18V04VQ44I?

The CF (Configuration) pin on the XC18V04VQ44I is an open-drain output pulsed Low for 300–500 ns when the JTAG CONFIG instruction is executed. It must be connected to the FPGA's PROGRAM pin to trigger hardware-synchronized reset and configuration initiation - a key feature for hot-reconfigurable systems.

Can multiple XC18V04VQ44I devices be cascaded for larger bitstream storage?

Yes, XC18V04VQ44I devices can be daisy-chained using the CEO output of one device to drive the CE input of the next. When the first device reaches terminal count, CEO goes Low to enable the second device's outputs - enabling seamless storage of bitstreams exceeding 4 Mbit (e.g., 8.21 Mbit for XC2VP20).

What is the operating temperature range for the XC18V04VQ44I?

The XC18V04VQ44I is rated for industrial temperature operation from –40°C to +85°C, with guaranteed performance including 20,000 program/erase cycles and 20-year data retention across this full range. This specification is validated and documented in Xilinx DS026 v4.1.

XC18V04VQ44I Specifications

Product attributes: Attribute value

Manufacturer:: AMD

Series:: -

Package/Case:: 44-TQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Programmable Type:: In System Programmable

Memory Size:: 4Mb

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

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

XC18V04VQ44I FAQ

1.How can I place an order for XC18V04VQ44I through Aetrix?

Please submit a Request for Quotation (RFQ) for XC18V04VQ44I 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 XC18V04VQ44I reliable?

The price and inventory of XC18V04VQ44I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC18V04VQ44I is usually 5 days.

3.What payment methods are accepted for XC18V04VQ44I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC18V04VQ44I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for XC18V04VQ44I?

XC18V04VQ44I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your XC18V04VQ44I 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 XC18V04VQ44I?

For technical support, including XC18V04VQ44I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC18V04VQ44I requirements.

6.How does Aetrix verify that XC18V04VQ44I is sourced from the original manufacturer or authorized distributors?

All XC18V04VQ44I 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 XC18V04VQ44I meets industry standards.

7.What is the process for return or replacement of XC18V04VQ44I?

All XC18V04VQ44I units undergo pre-shipment inspection (PSI). If there is an issue with XC18V04VQ44I, 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 XC18V04VQ44I part is unused and in its original packaging.

Return procedure for XC18V04VQ44I:

1.Submit a request within 90 days.

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

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