ATF1508AS-15JI84

Complex Programmable Logic Devices Overview

The ATF1508AS-15JI84 is a high-performance, electrically-erasable complex programmable logic device (CPLD) manufactured by Microchip Technology. It features 128 macrocells with up to 96 bi-directional I/O pins and four dedicated input pins in an 84-lead PLCC package. The device supports In-System Programmability (ISP) via JTAG and offers flexible logic macrocells with D/T/Latch configured flip-flops. Key electrical parameters include a maximum pin-to-pin delay of 7.5 ns, registered operation up to 125 MHz, and dual power supply requirements: VCCINT at 5.0V and VCCIO configurable for 3.3V or 5.0V I/O levels.

Complex Programmable Logic Devices Feature Summary

• 128 Macrocells with 5 product terms each, expandable to 40 via cascade logic
• 7.5 ns maximum pin-to-pin delay supporting registered operation up to 125 MHz
• In-System Programmability (ISP) using standard 4-pin JTAG interface
• Dual power supply architecture with separate VCCINT (5.0V) and VCCIO (3.3V/5.0V)

Complex Programmable Logic Devices Applications

• PCI-compliant interface designs requiring high current drivers
• Complex logic integration replacing TTL, SSI, MSI, LSI, and classic PLDs
• Systems requiring fast design iterations through field reprogrammability

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix 'J' corresponds to the 7.5 ns performance characteristic required for the target application timing constraints. Confirm that the industrial temperature range (-40°C to +85°C) aligns with the operational environment specifications before procurement.

Complex Programmable Logic Devices Selection Notes

Select this component when high-density logic (128 macrocells) and fast propagation delays (7.5 ns) are necessary within an 84-pin footprint. Ensure the design accommodates the separate VCCINT and VCCIO power domains, as VCCINT must always be connected to 5.0V while VCCIO determines the I/O voltage level compatibility.

Complex Programmable Logic Devices Part Context

This part belongs to the ATF1508AS family of Electrically Erasable PLDs. The 'AS' designation indicates enhanced routing resources and advanced features compared to earlier versions. The 'J' suffix specifies the 7.5 ns speed grade, and 'I' denotes the Industrial temperature range capability.

Complex Programmable Logic Devices Replacement Considerations

Direct replacements within the same package and speed grade include other ATF1508AS variants with different suffixes if speed or temperature ranges differ. Cross-family migration may require schematic adjustments due to the specific dual-voltage power architecture.