ATF1502ASL-25AC44

Overview

The ATF1502ASL-25AC44 is a high-performance, electrically-erasable Complex Programmable Logic Device (CPLD) from Microchip Technology. It features 32 logic macrocells with up to 36 inputs and 32 bi-directional I/O pins in a 44-pin TQFP package. The device supports In-System Programmability (ISP) via JTAG and offers a maximum pin-to-pin delay of 25 ns. Operating at 5V ±10%, it functions within an industrial temperature range of -40°C to +85°C. Key specifications include 10,000 program/erase cycles, 20-year data retention, and advanced power management features such as automatic standby and pin-controlled power-down modes.

Feature Summary

• 32 Macrocells with 5 product terms each, expandable to 40 via cascade logic
• In-System Programmability (ISP) using standard 4-pin JTAG interface
• Flexible macrocell architecture supporting D/T latch configurable flip-flops
• Advanced power management including automatic 10µA standby and pin-controlled power-down

Applications

• PCI-compliant interface designs requiring high current drivers
• Logic integration replacing TTL, SSI, MSI, LSI, and classic PLDs
• State machine initialization utilizing built-in power-up reset feature
• Boundary-scan testing compliant with IEEE Std. 1149.1

Procurement Notes

Verify the specific suffix 'AC' against official documentation to confirm commercial vs. industrial temperature ratings and voltage tolerances. Ensure design files account for the 5V ±10% supply requirement. Confirm that the 44-TQFP package dimensions match the target PCB footprint. Check for any Product Change Notifications (PCN) or End-of-Life (EOL) notices affecting this specific revision.

Selection Notes

Select the ATF1502ASL variant if low-power standby operation is required, as it features automatic 10µA standby compared to the standard AS version. Consider the 25 ns speed grade for applications requiring lower maximum frequencies than the -7 or -10 ns variants. Ensure sufficient macrocells are available for the logic function, noting that unused product terms are automatically disabled to reduce power consumption.

Part Context

This component belongs to the ATF1502AS(L) series of high-density CPLDs. It utilizes Atmel's proven electrically-erasable EEPROM technology, allowing complete reprogrammability. The series is designed for backward compatibility with earlier ATF1500/L software and hardware tools, facilitating migration from legacy programmable logic devices.

Replacement Considerations

Direct replacements within the same family include ATF1502AS-25AC44 (standard power) or ATF1502ASL-15AC44 (faster speed). Cross-family replacements may require logic restructuring due to differences in macrocell count and routing resources.