M5-128/68-5VC/1 Equivalent & Substitute Parts

Part Overview

The M5-128/68-5VC/1 is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's MACH® 5 series. This device features 128 macrocells, 68 I/O pins, and a propagation delay of 5.5 ns, housed in a 100-pin LQFP package. The part operates within a 4.75V to 5.25V supply voltage range and supports in-system programming.

The M5-128/68-5VC/1 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this CPLD.

Substiute Parts

M5-128/68-5VC/1

Lattice Semiconductor CorporationIn Stock: 1022M5-128/68-5VC/1 Datasheet

Current PartRFQ

ATF1508AS-7AX100

Microchip TechnologyIn Stock: 3232ATF1508AS-7AX100 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M5-128/68-5VC/1 is determined by the following critical parameters:

Core Functional Requirements:

• Macrocell count: 128 (minimum requirement for logic capacity)
• In-system programmability capability
• 100-pin LQFP package compatibility
• Surface mount mounting type
• Voltage supply range: 4.75V ~ 5.25V

Performance Considerations:

• Propagation delay (tpd) specifications must support timing requirements
• Operating temperature range: 0°C ~ 70°C

Compliance & Availability:

• Product status (active vs. obsolete)
• RoHS compliance status
• Moisture sensitivity level

The ATF1508AS-7AX100 from Microchip Technology meets the core functional requirements and package specifications. While it exhibits a longer propagation delay (7.5 ns vs. 5.5 ns), it maintains the same macrocell count, I/O capability, voltage supply range, and in-system programmability. The substitute part is currently in active production status with improved RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The ATF1508AS-7AX100 is a suitable substitute for the M5-128/68-5VC/1 based on the following factors:

Functional Compatibility: Both devices share identical macrocell counts (128) and support in-system programmability. The substitute provides 80 I/O pins compared to 68 on the original part, offering additional I/O capacity without reducing functionality.

Voltage and Temperature Alignment: Both parts operate within the same supply voltage range (4.75V ~ 5.25V) and temperature specification (0°C ~ 70°C), ensuring direct electrical compatibility in existing circuit designs.

Timing Consideration: The ATF1508AS-7AX100 exhibits a maximum propagation delay of 7.5 ns versus 5.5 ns for the original part. This 2 ns difference must be evaluated against the specific timing requirements of the target application. Systems with timing margins greater than 2 ns will accommodate this substitute without modification.

Product Status and Compliance: The substitute part is in active production status, ensuring long-term availability. It meets ROHS3 compliance requirements, whereas the original part is RoHS non-compliant. This compliance improvement may be advantageous for new designs or systems subject to environmental regulations.

Packaging: Both devices use 100-pin packages with identical physical dimensions (14x14 mm), supporting direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ATF1508AS-7AX100 directly replace the M5-128/68-5VC/1 without PCB modifications?

A: Yes, both devices use 100-pin packages with identical physical dimensions (14x14 mm). The PCB footprint is compatible. However, the ATF1508AS-7AX100 provides 80 I/O pins versus 68 on the original part. Unused I/O pins on the substitute can be left unconnected without affecting operation.

Q: What is the significance of the 2 ns propagation delay difference?

A: The ATF1508AS-7AX100 has a maximum propagation delay of 7.5 ns compared to 5.5 ns for the M5-128/68-5VC/1. This difference affects the maximum operating frequency of logic paths. Applications with timing budgets exceeding 2 ns will function correctly. Designs with tighter timing constraints require detailed timing analysis to confirm compatibility.

Q: Are the programming interfaces compatible between these two parts?

A: Both devices support in-system programmability. The ATF1508AS-7AX100 specifies a minimum of 10,000 program/erase cycles. Existing programming procedures and tools designed for the M5-128/68-5VC/1 may require verification for the substitute part, as manufacturer-specific programming protocols may differ.

Q: What is the impact of the RoHS compliance difference?

A: The M5-128/68-5VC/1 is RoHS non-compliant, while the ATF1508AS-7AX100 is ROHS3 compliant. For applications subject to environmental or regulatory requirements mandating RoHS compliance, the substitute part provides an advantage. For legacy systems without such requirements, this difference does not affect electrical functionality.

Q: Are both parts available in the same packaging format?

A: Both devices are housed in 100-pin packages with 14x14 mm dimensions. The M5-128/68-5VC/1 uses LQFP packaging, while the ATF1508AS-7AX100 uses TQFP packaging. These package types are mechanically and electrically compatible for standard PCB assembly processes.

Q: What is the moisture sensitivity consideration?

A: Both parts share an identical Moisture Sensitivity Level (MSL) rating of 3 with a 168-hour floor life. Handling, storage, and reflow procedures must comply with MSL 3 requirements for both devices.