M4A5-64/32-55VC Equivalent & Substitute Parts

Part Overview

The M4A5-64/32-55VC is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispMACH® 4A series. This embedded integrated circuit features 64 macrocells, 32 I/O pins, and a maximum propagation delay of 5.5 ns in a 44-pin TQFP surface mount package. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and production continuity.

Substiute Parts

M4A5-64/32-55VC

Lattice Semiconductor CorporationIn Stock: 721M4A5-64/32-55VC Datasheet

Current PartRFQ

ATF1504AS-7AX44

Microchip TechnologyIn Stock: 2170ATF1504AS-7AX44 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M4A5-64/32-55VC is determined by strict alignment of the following critical parameters:

• Macrocell Count: 64 macrocells (functional logic capacity)
• I/O Pin Count: 32 I/O pins (interface compatibility)
• Package Type: 44-TQFP (10x10) surface mount (physical and electrical compatibility)
• Voltage Supply Range: 4.75V ~ 5.25V (power supply compatibility)
• Operating Temperature Range: 0°C ~ 70°C (thermal operating envelope)
• Programmable Type: In System Programmable (design methodology compatibility)

The ATF1504AS-7AX44 from Microchip Technology meets all these critical parameters, making it a functionally equivalent substitute. While the propagation delay differs (7.5 ns versus 5.5 ns), this represents a relaxation of timing performance rather than a constraint, and is acceptable for applications where the original 5.5 ns specification was not a binding requirement.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504AS-7AX44 is the recommended substitute for the obsolete M4A5-64/32-55VC based on the following engineering factors:

Product Status: The original M4A5-64/32-55VC is obsolete, while the ATF1504AS-7AX44 is active and in production. This ensures long-term availability and supply chain stability.

Compliance and Certifications: The ATF1504AS-7AX44 is ROHS3 compliant, meeting current environmental and regulatory standards. The original part is RoHS non-compliant, which may present procurement and regulatory challenges in modern supply chains.

Functional Equivalence: Both devices share identical macrocell count (64), I/O pin count (32), package type (44-TQFP), voltage supply range (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C). Both support In System Programmable functionality.

Timing Consideration: The ATF1504AS-7AX44 has a maximum propagation delay of 7.5 ns compared to 5.5 ns for the original. This 2 ns difference represents a relaxation of timing performance. Selection of this substitute is appropriate for applications where the original 5.5 ns specification was not a critical design constraint.

Programmability: The ATF1504AS-7AX44 specifies a minimum of 10,000 program/erase cycles, confirming robust in-system programmability suitable for development and field updates.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504AS-7AX44 be used as a direct replacement for the M4A5-64/32-55VC?

A: Yes, the ATF1504AS-7AX44 is functionally equivalent for applications where the 5.5 ns propagation delay specification is not a binding requirement. Both devices have identical macrocell count (64), I/O pin count (32), package type (44-TQFP), voltage supply range, and operating temperature range. The substitute has a 7.5 ns maximum propagation delay, which is slower but acceptable for many applications.

Q: What is the primary reason for substitution?

A: The M4A5-64/32-55VC is obsolete and no longer in production. The ATF1504AS-7AX44 is an active product from Microchip Technology, ensuring availability and supply chain continuity.

Q: Are there any package or pinout differences?

A: No. Both devices use the 44-TQFP (10x10) surface mount package with identical pin counts and I/O configuration (32 I/O pins).

Q: Does the substitute meet current regulatory requirements?

A: Yes. The ATF1504AS-7AX44 is ROHS3 compliant, meeting current environmental standards. The original M4A5-64/32-55VC is RoHS non-compliant.

Q: What is the impact of the 2 ns timing difference?

A: The ATF1504AS-7AX44 has a maximum propagation delay of 7.5 ns versus 5.5 ns for the original. This represents a relaxation of timing performance. Applications requiring the faster 5.5 ns specification must evaluate whether the 7.5 ns timing is acceptable for their specific use case.

Q: Are both devices in-system programmable?

A: Yes. Both the M4A5-64/32-55VC and ATF1504AS-7AX44 support In System Programmable functionality, allowing field programming and updates.

Q: What is the voltage supply compatibility?

A: Both devices operate with an internal voltage supply range of 4.75V ~ 5.25V, ensuring direct compatibility in existing power supply designs.

Q: Are the operating temperature ranges identical?

A: Yes. Both devices operate across 0°C ~ 70°C (TA), providing identical thermal operating envelopes.