AMD XC1702LVQ44C

Overview

XC1702LVQ44C from Xilinx is a one-time programmable (OTP) configuration PROM designed to store FPGA bitstreams for Xilinx XC4000E/XL/XV and Spartan families. It provides 2,097,152 configuration bits, operates at 3.3 V, supports Master Serial mode with 44-pin VQFP packaging, and delivers ≤45 ns CLK-to-data delay for reliable FPGA boot-up in industrial control systems.

For engineers reviewing the XC1702LVQ44C datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3 V supply compatibility, cascading CEO/CE interface for multi-FPGA systems, programmable RESET/OE polarity, standby current of 350 µA, and guaranteed 20-year data retention - all critical for embedded reconfigurable logic deployments.

Technical Context

The XC1702LVQ44C functions as a serial configuration memory in Master Serial mode, where the FPGA's CCLK drives the PROM's CLK input and increments its internal address counter. Its DATA output connects directly to the FPGA's DIN pin, with timing governed by TCAC ≤45 ns and TCYC ≥67 ns under commercial conditions.

It supports daisy-chained configurations via CEO-to-CE interconnection and features dual-function RESET/OE with user-programmable active-High or active-Low polarity - defaulting to active-High but recommended as active-Low when driven by FPGA INIT. Standby mode is entered when CE = High, reducing ICCS to 350 µA with DATA in high-impedance state.

Key Specifications

Pinout & Package

XC1702LVQ44C is housed in a 44-pin Very Thin Quad Flat Package (VQFP), measuring 10 mm × 10 mm × 1.2 mm, with gull-wing leads and Pb-free (RoHS-compliant) finish. Pin 1 is marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC1702LPC44C, XC1702LVQ44C offers superior thermal dissipation and smaller board area; compared with XC1704LVQ44C, it trades capacity for lower cost and reduced programming time - making it optimal for cost-sensitive, mid-range FPGA deployments.

Availability

XC1702LVQ44C is available at Aetrix Electronics and suitable for industrial control systems, FPGA-based test instrumentation, communication gateways, and legacy reconfigurable signal processors requiring stable component supply and long-term obsolescence management.

Supply support for XC1702LVQ44C 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 technology and a global leader in FPGA, adaptive SoC, and ACAP solutions for aerospace, defense, communications, and industrial markets.

The XC1700L series - including XC1702LVQ44C - was engineered specifically for 3.3 V FPGA configuration in cost-sensitive, high-reliability embedded systems, emphasizing OTP security, low standby power, and seamless Master Serial integration.

FAQ

What is the primary function of the XC1702LVQ44C in an FPGA system?

The XC1702LVQ44C serves as a one-time programmable configuration PROM that stores and delivers the bitstream required to initialize Xilinx FPGAs in Master Serial mode. It receives clocking from the FPGA's CCLK pin, outputs serial data on the DATA pin to the FPGA's DIN input, and supports cascading via CEO/CE for multi-device configurations - ensuring deterministic, repeatable FPGA startup without external controllers.

Can the XC1702LVQ44C be reprogrammed after initial programming?

No, the XC1702LVQ44C is a one-time programmable (OTP) device. Once programmed using a compatible PROM programmer and Xilinx Alliance/Foundation software, its contents cannot be erased or rewritten. This immutability ensures configuration integrity in production systems but requires verification prior to programming - the device does not support in-system reprogramming or field updates.

How does the RESET/OE pin function on the XC1702LVQ44C?

The RESET/OE pin on the XC1702LVQ44C is programmable as either active-High RESET or active-Low OE. By default, it functions as active-High RESET to hold the address counter at zero and place DATA in high-impedance state. However, Xilinx recommends configuring it as active-Low OE to interface directly with the FPGA's INIT pin - enabling synchronous reset before configuration begins and avoiding power-on-reset timing mismatches.

What are the critical power supply requirements for the XC1702LVQ44C?

The XC1702LVQ44C requires a regulated 3.3 V supply (3.0–3.6 V) on VCC and a direct connection of VPP to VCC during normal read operation - leaving VPP floating or applying incorrect voltage causes unpredictable behavior. A 0.1 µF ceramic decoupling capacitor must be placed near pin 44 (VCC), and pin 38 (GND) must connect to a low-impedance ground plane to ensure stable timing and low noise.

Is the XC1702LVQ44C pin-compatible with other XC1700L-series PROMs in VQ44 packaging?

Yes, the XC1702LVQ44C shares identical pinout, package dimensions, and AC/DC timing characteristics with other XC1700L-series VQ44 devices including XC1701L, XC1704L, and XC1702LVQ44C - enabling drop-in replacement for capacity scaling. All use the same 44-pin VQFP footprint, matching NC pin locations, and identical control signal assignments (CLK, DATA, CE, RESET/OE, CEO, VCC, GND, VPP), allowing PCB reuse across the family.