ATF1502AS-15AI44

Overview

The ATF1502AS-15AI44 is a high-performance, electrically-erasable Complex Programmable Logic Device (CPLD) from Microchip Technology. It features 32 macrocells with up to 36 inputs and 32 bi-directional I/O pins in a 44-lead TQFP package. The device operates at a maximum frequency of 100 MHz with a maximum pin-to-pin propagation delay of 15 ns. It supports In-System Programmability (ISP) via JTAG, offers enhanced routing resources, and includes 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
• Maximum pin-to-pin delay of 15 ns and registered operation up to 100 MHz
• In-System Programmability (ISP) using standard 4-pin JTAG interface
• Advanced power management including automatic 10µA standby and pin-controlled power-down mode

Applications

• Logic replacement for TTL, SSI, MSI, LSI, and classic PLDs
• PCI-compliant interface designs requiring high current drivers
• Boundary-scan testing and system debugging via IEEE Std. 1149.1
• State machine initialization with power-up reset features

Procurement Notes

Verify the specific suffix 'I' indicates Industrial temperature range (-40°C to +85°C) and '44' denotes the TQFP package. Confirm the '-15' speed grade corresponds to the 15 ns delay specification. Check for Product Change Notifications or End-of-Life status as these legacy CPLD series may have discontinuance notifications. Ensure design tools support the ATF1502AS architecture for ISP programming.

Selection Notes

Select this component when 32 macrocells are sufficient for the logic density requirements. The -15 speed grade provides a balance between performance and power consumption. Consider the ATF1502ASL variant if lower standby current (10µA) is critical, though it has different timing characteristics. Ensure the design utilizes the JTAG interface for ISP if field updates are required, reserving four pins for TDI, TDO, TMS, and TCK.

Part Context

This part belongs to the ATF1502AS family of high-density CPLDs utilizing EEPROM technology. It is designed to integrate logic functions previously handled by multiple discrete chips. The device supports both commercial and industrial temperature ranges, with the 'I' suffix specifying the industrial grade. It is compatible with third-party development tools supporting JTAG boundary-scan description language (BSDL).

Replacement Considerations

Direct replacements include other ATF1502AS variants with different speed grades (e.g., -7, -10, -25) or packages (PLCC-44). For lower power applications, the ATF1502ASL series is an alternative. Verify pin compatibility and timing constraints when substituting with higher or lower speed grades.