Meta Description: XQ1701L-SO20N is a QML-certified 1Mbit configuration PROM in 20-pin SOIC package. Ideal for storing Xilinx FPGA bitstreams with military-grade reliability. Learn specs, pinout & applications.

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The XQ1701L-SO20N is a high-reliability configuration PROM (Programmable Read-Only Memory) designed specifically for storing and loading configuration bitstreams into Xilinx FPGA devices. Manufactured on Xilinx QML-certified production lines, this device delivers exceptional performance for aerospace, defense, and industrial applications requiring military-grade components.

What is XQ1701L-SO20N Configuration PROM?

The XQ1701L-SO20N belongs to the QPro series of configuration PROMs, offering one-time programmable (OTP) memory storage specifically optimized for FPGA configuration. With a storage capacity of 1,048,576 bits (1 Mbit), this device provides sufficient memory to configure a wide range of Xilinx FPGA devices in Master Serial or Slave Serial modes.

This configuration PROM features a simple serial interface that requires only one user I/O pin, making it an efficient solution for space-constrained designs. Additionally, the cascadable architecture allows multiple XQ1701L-SO20N devices to be daisy-chained for storing longer bitstreams or multiple configuration programs.

XQ1701L-SO20N Key Features and Benefits

High-Reliability QML Certification

The XQ1701L-SO20N is manufactured on Xilinx QML-certified production lines, ensuring consistent quality and reliability. This certification makes the device suitable for mission-critical applications in aerospace, defense, and high-reliability industrial systems.

Compact 20-Pin SOIC Package

The SO20N designation indicates a 20-pin Small Outline Integrated Circuit (SOIC) package, providing an excellent balance between board space efficiency and ease of handling during assembly. This package option is particularly advantageous for applications where printed circuit board real estate is limited.

Fast Configuration Support

Supporting configuration speeds up to 15.0 MHz in fast configuration mode, the XQ1701L-SO20N enables rapid FPGA initialization. This high-speed capability is essential for systems requiring quick boot times or frequent reconfiguration cycles.

XQ1701L-SO20N Technical Specifications

Electrical Characteristics of XQ1701L-SO20N

DC Parameters

AC Timing Parameters

XQ1701L-SO20N Pin Configuration

Pin Functions Overview

Important Connection Guidelines

When implementing the XQ1701L-SO20N in your design, the DATA output connects directly to the FPGA DIN input. The CLK input receives the configuration clock signal from the FPGA CCLK output. Furthermore, the RESET/OE input is best driven by the FPGA INIT output to ensure proper address counter reset before any configuration or reconfiguration cycle.

Compatible FPGA Devices

The XQ1701L-SO20N supports configuration of various Xilinx FPGA families. Below is a compatibility reference table showing the number of PROMs required for each device.

How to Cascade Multiple XQ1701L-SO20N Devices

For FPGA devices requiring more configuration memory than a single XQ1701L-SO20N provides, multiple PROMs can be cascaded in a daisy-chain configuration. This cascading mechanism works seamlessly through the CEO (Chip Enable Output) pin.

Cascading Configuration Steps

1. Connect the CEO output of the first PROM to the CE input of the second PROM
2. Interconnect all CLK inputs together
3. Connect all DATA outputs together (directly to FPGA DIN)
4. Connect all RESET/OE inputs together (driven by FPGA INIT)

When the first PROM reaches its terminal count, it automatically asserts CEO low, enabling the next device in the chain. This process continues until all configuration data has been transferred to the FPGA.

Absolute Maximum Ratings

Important: Exceeding these absolute maximum ratings may cause permanent device damage. These are stress ratings only and do not imply functional operation under these conditions.

XQ1701L-SO20N Applications

Aerospace and Defense Systems

The QML certification and wide operating temperature range make the XQ1701L-SO20N ideal for avionics, satellite systems, and military electronics where reliability under extreme conditions is paramount.

Industrial Automation

High-reliability industrial control systems benefit from the robust performance characteristics and long-term data retention of this configuration PROM.

Telecommunications Infrastructure

Network equipment and telecommunications systems requiring secure, reliable FPGA configuration storage utilize the XQ1701L-SO20N for mission-critical applications.

Ordering Information

SMD Ordering Reference

For procurement through defense supply channels, the XQ1701L is available under Standard Microcircuit Drawing (SMD) number 5962-9951401.

Design Considerations for XQ1701L-SO20N

Power Supply Requirements

The VPP pin must be connected to VCC during normal read operation. Leaving this pin floating can lead to unpredictable, temperature-dependent behavior and severe debugging issues. Therefore, always ensure proper VPP connection in your circuit design.

Reset Polarity Configuration

The RESET/OE pin features programmable polarity, defaulting to active-high reset. However, the preferred configuration is active-low reset, as this allows direct connection to the FPGA INIT pin for automatic reset synchronization.

Standby Mode Operation

The XQ1701L-SO20N enters low-power standby mode when CE is asserted high, reducing supply current to 100µA maximum. Consequently, this feature helps minimize system power consumption when the PROM is not actively being accessed.

Conclusion

The XQ1701L-SO20N represents an excellent choice for engineers requiring a reliable, military-grade configuration PROM solution. With its QML certification, 1 Mbit capacity, and compact SOIC package, this device delivers the performance and reliability demanded by aerospace, defense, and high-reliability industrial applications. Its simple serial interface, cascadable architecture, and fast configuration support make integration straightforward while maintaining the highest quality standards.