ATF1500AL-20AI

Overview

The ATF1500AL-20AI is a high-performance, high-density Electrically Erasable Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology. It features 32 logic macrocells and up to 36 inputs within a 44-pin package. Built on advanced Flash technology, the device supports registered operation at speeds up to 125 MHz with a maximum pin-to-pin delay of 7.5 ns for the -7 speed grade. The specific ATF1500AL-20AI variant operates in the Industrial temperature range (-40°C to +85°C) and utilizes a TQFP package. It includes flexible macrocell architecture, global/regional busses, and power management features such as automatic standby and pin-controlled power-down modes.

Feature Summary

• High-density CPLD with 32 macrocells, 32 I/O pins, and 4 dedicated input pins.
• Advanced Flash technology enabling 100 program/erase cycles and 20-year data retention.
• Flexible macrocell architecture supporting D/T/Latch configurable flip-flops and programmable output slew rates.
• Built-in power management including automatic 3 mA standby mode and pin-controlled power-down reducing current to below 10 mA.

Applications

• Integration of logic from TTL, SSI, MSI, and classic PLDs.
• Sequential logic operation requiring registered feedback paths.
• Applications necessitating low-power standby and controlled output slew rates to reduce system noise.

Procurement Notes

Verify the component status as the datasheet indicates a last time buy date of September 30, 2005, for certain shaded parts. Confirm that the specific ordering code matches the required speed grade and package type, as replacements are suggested for obsolete fast-speed grades. Ensure compatibility with third-party design tools and programmers before procurement.

Selection Notes

Select the ATF1500A series based on required speed grades, ranging from 7 ns to 25 ns propagation delay. Choose between Commercial (0°C to 70°C) and Industrial (-40°C to 85°C) temperature ranges. Verify package requirements, as the device is available in 44-lead TQFP and PLCC packages. Consider the ATF1502AS as a pin-compatible replacement for faster speed grades if necessary.

Part Context

The ATF1500A(L) series belongs to Microchip's family of high-performance EPLDs. It offers backward compatibility with ATF1500/L software and hardware. The device simplifies logic placement through its fully connected input and feedback logic array, eliminating pinout changes due to design modifications. It supports security fuse features to prevent unauthorized copying of fuse patterns.

Replacement Considerations

For fast-speed grades, the ATF1502AS is a pin-compatible replacement. For other obsolete variants, suggested replacements are available in Green packages. Use commercial products for industrial temperature ranges by downgrading one speed grade and de-rating power by 30%.