ATF1502ASL-25JU44

Overview

The ATF1502ASL-25JU44 is a high-performance, electrically-erasable Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology. It features 32 macrocells with up to 40 product terms per macrocell and operates within a supply voltage range of 4.5V to 5.5V. The device provides a maximum pin-to-pin delay of 25ns and supports registered operation up to 50MHz. It utilizes In-System Programmability (ISP) via JTAG and includes advanced power management features such as automatic standby and pin-controlled power-down modes. The component is housed in a 44-lead PLCC package and is rated for industrial temperature ranges from -40°C to +85°C.

Feature Summary

• 32 Macrocells with expandable logic structure supporting up to 40 product terms per macrocell via cascade logic.
• In-System Programmability (ISP) using the standard 4-pin JTAG interface compliant with IEEE Std. 1149.1.
• Advanced power management including automatic 10μA standby mode and pin-controlled power-down reducing current to below 5mA.
• Flexible macrocell design with configurable D/T latch flip-flops, global/individual register control, and programmable output slew rates.

Applications

• PCI-compliant interface designs requiring high current drivers and low output skew.
• High-density logic integration replacing TTL, SSI, MSI, or classic PLDs in embedded systems.
• Applications requiring field modifications via software without removing the device from the PCB.
• Power-sensitive digital designs utilizing automatic standby and reduced-power macrocell options.

Procurement Notes

Verify the specific suffix 'JU44' corresponds to the 44-lead PLCC package and industrial temperature grade (-40°C to +85°C). Confirm that the 'L' designation indicates the low-power variant with automatic standby features. Ensure programming hardware supports the ISP JTAG protocol for this EEPROM-based CPLD family.

Selection Notes

Select the ATF1502ASL-25JU44 when a 25ns speed grade is sufficient for system timing requirements. Choose this part over the AS version if lower static power consumption is critical due to the automatic standby feature. Ensure the design accommodates the 5V ±10% supply voltage requirement. Verify that the 44-pin PLCC footprint matches the PCB layout constraints.

Part Context

This component belongs to the ATF1502AS(L) series of high-density CPLDs. It shares architectural similarities with the ATF1504 series but offers fewer macrocells (32 vs 64). The 'ASL' designation distinguishes it from the standard 'AS' variant by providing enhanced low-power characteristics, specifically the automatic standby mode, while maintaining the same 5V operating voltage and EEPROM technology.

Replacement Considerations

Direct replacements include other ATF1502ASL variants with different speed grades (e.g., ATF1502ASL-7JU44 for 7.5ns delay or ATF1502ASL-10JU44 for 10ns delay), provided timing constraints allow. Cross-family replacement with ATF1504ASL requires verification of I/O count and macrocell availability.