ATF1500AL-20AU

Overview

The ATF1500AL-20AU is a high-performance, high-density Electrically Erasable Complex Programmable Logic Device (EEPLD) manufactured by Microchip Technology. It features 32 logic macrocells and up to 36 inputs within a 44-pin Thin Plastic Gull Wing Quad Flatpack (TQFP) package. The device utilizes advanced Flash technology, supporting maximum pin-to-pin delays of 20 ns and registered operation speeds up to 40 MHz with external feedback. It operates on a 5V power supply and is rated for industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Advanced Flash Technology: Non-volatile memory offering 100 program/erase cycles, 20-year data retention, and complete reprogrammability without UV erasure.
• Flexible Macrocell Architecture: Each of the 32 macrocells includes D/T/Latch configurable flip-flops, global and individual register control signals, and programmable output slew rate control.
• Global and Regional Busses: A fully connected input and feedback logic array allows designs to be modified without pinout changes, supporting complex sum terms via cascade logic chains.
• Power Management: Includes automatic low-power standby mode and an optional pin-controlled power-down mode reducing current to below 10 mA.

Applications

• Replacing legacy TTL, SSI, MSI, and classic PLD logic functions in industrial control systems.
• Implementing state machines requiring initialization via power-up reset circuits.
• Designs requiring flexible I/O configurations with programmable pin-keeper inputs to prevent floating lines.

Procurement Notes

Verify component authenticity through authorized Microchip distributors or direct channels. Confirm RoHS compliance status as the datasheet indicates Green package options are available but standard versions may differ. Ensure design files account for the specific speed grade (-20) and industrial temperature range requirements during procurement planning.

Selection Notes

Select the ATF1500AL-20AU when industrial temperature stability (-40°C to +85°C) and lower standby power consumption (3 mA typical) are required compared to the standard ATF1500A series. Choose this part over faster grades if system timing constraints allow for a 20 ns delay and 40 MHz maximum frequency. Verify that the 44-pin TQFP footprint matches the PCB layout constraints.

Part Context

This component belongs to the ATF1500A(L) family of EEPLDs, which are backward compatible with earlier ATF1500/L software and hardware tools. The 'L' suffix denotes the low-power variant with enhanced standby characteristics, while 'AU' specifies the industrial temperature range and TQFP packaging. It serves as a drop-in replacement for many discrete logic solutions in embedded applications.

Replacement Considerations

For fast-speed grade replacements, the ATF1502AS is noted as pin-compatible. For other specifications, suggested replacements are available in Green packages. Designers should verify pin compatibility and electrical parameter alignment before substituting.