ATF1504AS-7JC84 Equivalent & Substitute Parts

Part Overview

The ATF1504AS-7JC84 is a Complex Programmable Logic Device (CPLD) from Microchip Technology's ATF15xx series, featuring 64 macrocells and 64 I/O pins in an 84-pin PLCC package. This device is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates with a maximum propagation delay of 7.5 ns and supports in-system programming with a minimum of 10,000 program/erase cycles.

Substiute Parts

ATF1504AS-7JC84

Microchip TechnologyIn Stock: 1183ATF1504AS-7JC84 Datasheet

Current PartRFQ

ATF1504AS-10JU84

Microchip TechnologyIn Stock: 5034ATF1504AS-10JU84 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF1504AS-7JC84 is based on the following critical parameters that must remain consistent:

• Macrocell Count: 64 macrocells (functional logic capacity)
• I/O Pin Count: 64 I/O pins (interface compatibility)
• Package Type: 84-LCC (J-Lead) in 84-PLCC footprint (physical and electrical compatibility)
• Mounting Type: Surface Mount (assembly compatibility)
• Programmable Architecture: In System Programmable with minimum 10K program/erase cycles (programming methodology)
• Series Family: ATF15xx (design compatibility)

The ATF1504AS-10JU84 qualifies as a direct substitute because it maintains all core functional and physical parameters while offering enhanced specifications in delay time, voltage supply range, and operating temperature.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504AS-10JU84 is the qualified substitute for the obsolete ATF1504AS-7JC84. Selection should be based on the following factors:

Product Status: The ATF1504AS-7JC84 is obsolete, while the ATF1504AS-10JU84 maintains active product status, ensuring long-term availability and supply chain continuity.

Compliance Requirements: The ATF1504AS-10JU84 is ROHS3 compliant, whereas the main part is RoHS non-compliant. This distinction is critical for applications subject to RoHS regulations.

Performance Characteristics: The substitute part exhibits a maximum propagation delay of 10 ns compared to 7.5 ns for the main part. This 2.5 ns difference is acceptable for most CPLD applications where timing margins are designed with adequate guardband.

Operating Range: The ATF1504AS-10JU84 provides an extended operating temperature range (-40°C to 85°C) and wider voltage supply tolerance (4.5V to 5.5V) compared to the main part (0°C to 70°C, 4.75V to 5.25V), offering greater design flexibility.

Packaging and Handling: The substitute part carries MSL 3 (168 hours) versus MSL 2 (1 year) for the main part, requiring more stringent moisture control during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504AS-10JU84 be used as a direct replacement for the ATF1504AS-7JC84?

A: Yes. Both devices share identical macrocell count (64), I/O pin count (64), package type (84-LCC), and programmable architecture. The substitute part is functionally compatible at the circuit level.

Q: What is the significance of the delay time difference (7.5 ns vs. 10 ns)?

A: The ATF1504AS-10JU84 has a maximum propagation delay 2.5 ns longer than the main part. This affects the maximum operating frequency of logic paths. Designs must verify that timing constraints remain satisfied with the substitute part's specifications.

Q: Are there packaging differences between these parts?

A: Both parts use 84-PLCC packaging with identical footprints (29.31x29.31 mm). The main part is supplied in standard packaging, while the substitute is supplied in Tube packaging. PCB layout and assembly compatibility are identical.

Q: What does the MSL rating difference mean for handling?

A: MSL 2 (1 Year) for the main part allows one year of storage at controlled humidity before use. MSL 3 (168 Hours) for the substitute requires reflow within 168 hours of moisture exposure. Proper moisture control and baking procedures are necessary before assembly.

Q: Is the voltage supply range difference important?

A: The substitute part accepts 4.5V to 5.5V versus 4.75V to 5.25V for the main part. The wider tolerance of the substitute provides better compatibility with varying power supply conditions and is generally advantageous for system design.

Q: Why is the main part obsolete?

A: The ATF1504AS-7JC84 is classified as obsolete by Microchip Technology. The ATF1504AS-10JU84 remains in active production, making it the recommended choice for new designs and ongoing production.