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

AMD XC18V01VQ44I

Name: XC18V01VQ44I
Brand: AMD
SKU: XC18V01VQ44I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: XC18V01VQ44I

Manufacturer:: AMD

Category:: Configuration PROMs for FPGAs

Package:: 44-TQFP

Datasheet:: XC18V01VQ44I.pdf

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

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Product details

Overview

XC18V01VQ44I from Xilinx is a 1-Mbit in-system programmable (ISP) configuration PROM designed to store and load bitstreams into Xilinx FPGAs in Master Serial, Slave Serial, or Slave-Parallel/SelectMAP modes. It operates at 3.3V VCCINT and 3.3V/2.5V VCCO, supports 20,000 program/erase cycles, functions across –40°C to +85°C industrial temperature range, and features IEEE 1149.1 JTAG boundary-scan for in-system programming and verification - used in FPGA-based industrial control and reconfigurable embedded systems.

For engineers reviewing the XC18V01VQ44I datasheet, pinout, applications, or equivalent options, key selection considerations include serial vs. parallel configuration throughput (up to 33 MHz serial clock / 264 Mb/s parallel), JTAG-initiated FPGA reset via CF pin, 5V-tolerant I/O compatibility, cascading support via CEO/CE chaining, and security-bit protection against unauthorized JTAG readback.

Technical Context

The XC18V01VQ44I implements a flash-based nonvolatile memory architecture with dual-mode interface logic: serial mode uses single-pin D0 data output synchronized to CCLK rising edges, while parallel mode enables byte-wide D0–D7 output under same clock. Its internal address counter increments only when CE is low and OE/RESET is high, and resets on OE/RESET assertion or CE high transition.

JTAG TAP controller fully complies with IEEE 1149.1, supporting mandatory instructions (BYPASS, SAMPLE/PRELOAD, EXTEST) and XC18V00-specific CONFIG instruction that pulses CF low for 300–500 ns to trigger FPGA reconfiguration. The device includes dedicated security bit (IR[3]) and ISP status flag (IR[4]) in its 8-bit instruction register, enabling secure, verified in-system programming without power cycling.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory capacity	1,048,576 bits (1 Mbit) - stores full configuration bitstream for XCV50, XCV100, XC2S50, and similar mid-range Xilinx FPGAs.
Configuration interface	Serial (D0 only) or parallel (D0–D7) - selectable via JTAG-accessible control register; serial is default, parallel requires iMPACT "Parallel mode" setting.
Operating voltage	VCCINT = 3.3V ±10%; VCCO = 3.3V or 2.5V - supports mixed-voltage FPGA interfaces; I/O pins tolerate 5V inputs regardless of VCCO setting.
Endurance & retention	20,000 program/erase cycles; ≥20 years data retention - validated over full industrial temperature range (–40°C to +85°C).
JTAG compliance	Fully IEEE 1149.1-compliant with TAP, IDCODE (05024093h/05034093h), USERCODE, and CONFIG instruction - enables standardized ISP, boundary-scan test, and secure FPGA reinitiation.
Access timing	Serial access time ≤15 ns after CE/OE enable; parallel byte output valid within one CCLK cycle - ensures reliable synchronization with FPGA CCLK up to 33 MHz.

Pinout & Package

XC18V01VQ44I 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 corner notch; package thermal pad is not electrically connected.

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 CLK rising edge occurs.
D1–D7	Parallel data outputs	Drive FPGA D[1:7] in Slave-Parallel/SelectMAP mode; tri-stated in serial mode - may be left unconnected if serial-only use case.
CLK	Configuration clock input	Driven by FPGA CCLK (Master modes) or external oscillator (Slave modes); increments address counter on rising edge when CE=Low and OE/RESET=High.
OE/RESET	Output enable / FPGA INIT control	Bidirectional open-drain pin; pulled high via 4.7 kΩ to release FPGA INIT; drives FPGA INIT pin directly to synchronize reset and configuration start.
CE	Chip enable input	Active-low; forces address counter reset and DATA pins to high-Z when high - used for standby power reduction or DONE-driven gating.
CEO	Cascade enable output	Open-drain output; goes low when current PROM reaches terminal count, enabling next PROM in daisy chain - enables seamless multi-device bitstream storage.
CF	Configuration trigger output	Open-drain; pulsed low for 300–500 ns by JTAG CONFIG instruction to assert FPGA PROGRAM pin - allows FPGA reconfiguration without power cycle or hardware reset.
TCK/TMS/TDI/TDO	JTAG test access port	Standard 4-wire IEEE 1149.1 interface; supports ISP programming, IDCODE readback, security bit setting, and boundary-scan testing - no external level shifters needed.
VCCINT	Core logic supply	3.3V ±10% supply for internal flash array and control logic; pins 17, 35, 38 (VQ44) must all be decoupled with 0.1 µF ceramic capacitors.
VCCO	I/O buffer supply	3.3V or 2.5V supply for D0–D7, CEO, CF, OE/RESET drivers - sets output voltage level and enables 5V-tolerant input operation independent of VCCO value.

Key Features

Feature	Design Value
In-system programmability	Full JTAG-based erase/program/verify without socketing - enables field firmware updates and rapid design iteration using iMPACT or third-party SVF-compatible programmers.
Dual configuration modes	Hardware-selectable serial (1-bit) or parallel (8-bit) interface - reduces configuration time by 8× in Slave-Parallel mode while maintaining pin compatibility and layout reuse.
JTAG-initiated FPGA reset	CF pin pulse via CONFIG instruction provides deterministic, software-controlled FPGA reconfiguration - eliminates need for external reset circuitry or power cycling.
Security bit protection	User-settable read-inhibit bit prevents JTAG readback of stored bitstream - erasure is only method to clear security; protects IP in production FPGA deployments.
Cascadable architecture	CEO-to-CE daisy-chaining supports unlimited expansion of configuration memory - enables single-FPGA multi-bitstream or multi-FPGA synchronized configuration from one JTAG chain.

Applications

Industrial PLC Configuration Storage	Aerospace Reconfigurable Payloads
Use Scenario: Storing and loading FPGA configuration bitstreams in programmable logic controllers deployed in factory automation environments with frequent firmware updates. IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, power-on auto-load of safety-critical control logic into XCV100/XC2S100 FPGAs via Master Serial mode. Use Value: Enables zero-downtime field upgrades via JTAG ISP; 20,000-cycle endurance supports >10 years of scheduled maintenance cycles without PROM replacement.	Use Scenario: Supporting radiation-tolerant, reprogrammable FPGA payloads in satellite subsystems requiring in-orbit bitstream patching and mission adaptation. IC Role / Device Role / Timing Role: Secure, cascaded configuration source for Virtex-II FPGAs operating in Slave-SelectMAP mode with external oscillator clocking. Use Value: JTAG CONFIG-triggered CF pulse allows safe, synchronized FPGA reconfiguration without resetting adjacent avionics; security bit prevents unauthorized bitstream extraction.
Medical Imaging FPGA Boot	Test Equipment Bitstream Management
Use Scenario: Loading high-reliability configuration images into Spartan-II FPGAs used in real-time ultrasound beamforming modules with strict boot-time requirements. IC Role / Device Role / Timing Role: Low-latency serial PROM delivering bitstream at 33 MHz CCLK to meet <50 ms FPGA startup window; OE/RESET tied to FPGA INIT for precise timing alignment. Use Value: 15 ns serial access time ensures immediate data availability post-CCLK edge - eliminates configuration stalls and guarantees deterministic boot sequence.	Use Scenario: Managing multiple FPGA configurations in automated test equipment (ATE) platforms where different DUTs require distinct bitstreams per test profile. IC Role / Device Role / Timing Role: Parallel-mode PROM bank (cascaded XC18V01VQ44I units) storing 8+ bitstreams; selected via FPGA GPIO-controlled CE gating. Use Value: Byte-wide 264 Mb/s parallel interface cuts configuration time by >80% vs. serial - accelerates test cycle throughput without redesigning PCB layout.

Industrial PLC Configuration Storage

Aerospace Reconfigurable Payloads

Use Scenario: Storing and loading FPGA configuration bitstreams in programmable logic controllers deployed in factory automation environments with frequent firmware updates.

IC Role / Device Role / Timing Role: Nonvolatile configuration PROM providing deterministic, power-on auto-load of safety-critical control logic into XCV100/XC2S100 FPGAs via Master Serial mode.

Use Value: Enables zero-downtime field upgrades via JTAG ISP; 20,000-cycle endurance supports >10 years of scheduled maintenance cycles without PROM replacement.

Use Scenario: Supporting radiation-tolerant, reprogrammable FPGA payloads in satellite subsystems requiring in-orbit bitstream patching and mission adaptation.

IC Role / Device Role / Timing Role: Secure, cascaded configuration source for Virtex-II FPGAs operating in Slave-SelectMAP mode with external oscillator clocking.

Use Value: JTAG CONFIG-triggered CF pulse allows safe, synchronized FPGA reconfiguration without resetting adjacent avionics; security bit prevents unauthorized bitstream extraction.

Medical Imaging FPGA Boot

Test Equipment Bitstream Management

Use Scenario: Loading high-reliability configuration images into Spartan-II FPGAs used in real-time ultrasound beamforming modules with strict boot-time requirements.

IC Role / Device Role / Timing Role: Low-latency serial PROM delivering bitstream at 33 MHz CCLK to meet <50 ms FPGA startup window; OE/RESET tied to FPGA INIT for precise timing alignment.

Use Value: 15 ns serial access time ensures immediate data availability post-CCLK edge - eliminates configuration stalls and guarantees deterministic boot sequence.

Use Scenario: Managing multiple FPGA configurations in automated test equipment (ATE) platforms where different DUTs require distinct bitstreams per test profile.

IC Role / Device Role / Timing Role: Parallel-mode PROM bank (cascaded XC18V01VQ44I units) storing 8+ bitstreams; selected via FPGA GPIO-controlled CE gating.

Use Value: Byte-wide 264 Mb/s parallel interface cuts configuration time by >80% vs. serial - accelerates test cycle throughput without redesigning PCB layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
XC18V02VQ44I	2-Mbit capacity; identical pinout, timing, and feature set - differs only in memory density.	Suitable for larger FPGAs (e.g., XC2S200, XCV200) requiring >1 Mbit bitstream; no change to interface logic or PCB layout.	Select when target FPGA configuration exceeds 1,048,576 bits - drop-in upgrade with no firmware or hardware modifications required.
XC18V01PC44I	Same 1-Mbit capacity and electrical specs, but in 44-pin plastic leaded chip carrier (PLCC) package - differs only in mechanical form factor.	Used where through-hole mounting, higher thermal mass, or socket-based field replacement is preferred over surface-mount VQFP.	Choose for legacy board designs with PLCC footprints or serviceability requirements - identical functionality and JTAG behavior.

Compared with XC18V02VQ44I, the XC18V01VQ44I offers optimal cost and footprint for sub-1-Mbit FPGA configurations; compared with XC18V01PC44I, it delivers superior thermal performance and smaller PCB area in modern SMT manufacturing, with no trade-off in reliability or programming capability.

Availability

XC18V01VQ44I is available at Aetrix Electronics and suitable for industrial control systems, aerospace reconfigurable payloads, medical imaging equipment, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed authenticity.

Supply support for XC18V01VQ44I 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, adaptable silicon solutions for communications, aerospace, industrial, and automotive markets since 1984.

The XC18V00 series was engineered specifically to provide robust, in-system programmable configuration storage for Xilinx's early-generation FPGAs - emphasizing JTAG security, industrial temperature resilience, and seamless integration with Alliance/Foundation design tools.

FAQ

What configuration modes does the XC18V01VQ44I support, and how are they selected?

The XC18V01VQ44I supports serial (D0 only) and parallel (D0–D7) configuration modes. Serial mode is the default; parallel mode is enabled by setting the "Parallel mode" option in Xilinx iMPACT software, which writes to a user-accessible control register via JTAG. No hardware changes or strap pins are required - mode selection is purely software-configurable and persists across power cycles.

How does the CF pin function in the XC18V01VQ44I, and what is its timing behavior?

The CF (Configuration) pin on the XC18V01VQ44I is an open-drain output pulsed low for 300–500 ns upon execution of the JTAG CONFIG instruction. It must be connected to the FPGA's PROGRAM pin to initiate a full configuration cycle. This pulse is generated independently of CE/OE states and provides a precise, software-controlled reset-and-reload mechanism without requiring external circuitry or power interruption.

Can the XC18V01VQ44I be used to configure newer Xilinx FPGA families like Virtex-II or Spartan-3?

No - the XC18V01VQ44I is designed exclusively for first-generation Xilinx FPGAs including XC2S, XC3S, XCV, and Virtex-E families. It lacks the voltage signaling, timing margins, and bitstream format compatibility required for Virtex-II, Spartan-3, or later families. For those devices, Xilinx recommends Platform Flash or newer PROM families such as XCFxx.

What is the purpose of the CEO pin, and how is it used in cascaded configurations?

The CEO (Chip Enable Output) pin on the XC18V01VQ44I goes low when the internal address counter reaches terminal count and OE/RESET is high - signaling end-of-data to the next PROM in a daisy chain. It drives the CE input of the downstream device, enabling automatic handoff during multi-PROM bitstream reads. This eliminates external logic and ensures glitch-free, synchronous cascading across any number of XC18V00-series devices.

Does the XC18V01VQ44I support 5V-tolerant inputs, and which pins are affected?

Yes - all I/O pins (D0–D7, CLK, CE, OE/RESET, CEO, CF, TCK, TMS, TDI, TDO) on the XC18V01VQ44I are 5V-tolerant regardless of VCCO voltage (3.3V or 2.5V). This allows direct interfacing with 5V FPGA mode pins, microcontroller control signals, or legacy system buses without level-shifting circuitry - simplifying mixed-voltage board design and improving signal integrity.

XC18V01VQ44I 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:: 1Mb

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

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

XC18V01VQ44I FAQ

1.How can I place an order for XC18V01VQ44I through Aetrix?

Please submit a Request for Quotation (RFQ) for XC18V01VQ44I 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 XC18V01VQ44I reliable?

The price and inventory of XC18V01VQ44I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XC18V01VQ44I is usually 5 days.

3.What payment methods are accepted for XC18V01VQ44I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XC18V01VQ44I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for XC18V01VQ44I?

XC18V01VQ44I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your XC18V01VQ44I 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 XC18V01VQ44I?

For technical support, including XC18V01VQ44I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XC18V01VQ44I requirements.

6.How does Aetrix verify that XC18V01VQ44I is sourced from the original manufacturer or authorized distributors?

All XC18V01VQ44I 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 XC18V01VQ44I meets industry standards.

7.What is the process for return or replacement of XC18V01VQ44I?

All XC18V01VQ44I units undergo pre-shipment inspection (PSI). If there is an issue with XC18V01VQ44I, 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 XC18V01VQ44I part is unused and in its original packaging.

Return procedure for XC18V01VQ44I:

1.Submit a request within 90 days.

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

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