M5-128/120-12YC/1 Equivalent & Substitute Parts

Part Overview

The M5-128/120-12YC/1 is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's MACH® 5 series. This device features 128 macrocells, 120 I/O pins, and a maximum propagation delay of 12 ns in a 160-BQFP package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

M5-128/120-12YC/1

Lattice Semiconductor CorporationIn Stock: 1171M5-128/120-12YC/1 Datasheet

Current PartRFQ

ATF1508AS-7AX100

Microchip TechnologyIn Stock: 3232ATF1508AS-7AX100 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M5-128/120-12YC/1 is determined by the following critical parameters:

Functional Equivalence Criteria:

• Macrocell count: 128 macrocells (core logic capacity)
• Programmable architecture: In System Programmable capability
• Voltage supply range: 4.75V ~ 5.25V compatibility
• Operating temperature range: 0°C ~ 70°C
• Moisture sensitivity level: MSL 3 (168 Hours)

Performance Consideration:

• Propagation delay specifications must meet or exceed the original 12 ns maximum

Package Compatibility:

• Pin count and electrical functionality determine package suitability; physical package form factor may differ based on application constraints

The ATF1508AS-7AX100 from Microchip Technology meets the core functional requirements of 128 macrocells, in-system programmability, and identical voltage and temperature specifications. This device is classified as active and RoHS3 compliant, addressing obsolescence concerns while maintaining electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The ATF1508AS-7AX100 provides functional equivalence for the M5-128/120-12YC/1 based on matching macrocell count, programmable architecture, voltage supply range, and operating temperature specifications. The substitute device offers superior propagation delay performance at 7.5 ns compared to the original 12 ns specification.

Product Status Advantage:

The ATF1508AS-7AX100 is classified as active, eliminating obsolescence risk associated with the M5-128/120-12YC/1. This ensures long-term availability and continued manufacturer support.

Compliance Consideration:

The substitute device is RoHS3 compliant, whereas the original part is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements.

I/O Pin Count Difference:

The ATF1508AS-7AX100 provides 80 I/O pins versus 120 I/O pins on the original device. Design implementations must accommodate this reduction in available I/O resources. The 100-TQFP package differs from the 160-BQFP package of the original part, requiring PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the ATF1508AS-7AX100 directly replace the M5-128/120-12YC/1 in existing designs?

A: Functional replacement is possible if the design utilizes 80 or fewer I/O pins. The reduced I/O count and different package form factor require PCB redesign and firmware revalidation. The superior propagation delay of 7.5 ns is compatible with timing requirements specified for 12 ns operation.

Q: What is the significance of the macrocell count match?

A: The 128 macrocell count is the primary indicator of logic capacity equivalence. Both devices provide identical programmable logic resources, ensuring that designs targeting this capacity level can be ported between devices.

Q: How does the I/O pin reduction affect substitution?

A: The ATF1508AS-7AX100 provides 40 fewer I/O pins than the original M5-128/120-12YC/1. Designs requiring more than 80 I/O pins cannot use this substitute without architectural modification or use of additional I/O expansion devices.

Q: Are the voltage supply and temperature ranges identical?

A: Yes. Both devices operate within 4.75V ~ 5.25V supply voltage and 0°C ~ 70°C temperature ranges, ensuring electrical compatibility in equivalent operating environments.

Q: What is the impact of RoHS compliance differences?

A: The original M5-128/120-12YC/1 is RoHS non-compliant, while the ATF1508AS-7AX100 is RoHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute device provides compliance advantage.

Q: Does the faster propagation delay of the substitute create compatibility issues?

A: No. The ATF1508AS-7AX100 at 7.5 ns maximum propagation delay exceeds the performance of the original 12 ns specification. Designs validated for 12 ns operation remain valid with the faster substitute device.

Q: What package considerations apply to substitution?

A: The original device uses a 160-BQFP (28x28) package, while the substitute uses a 100-TQFP (14x14) package. These are physically distinct packages requiring separate PCB footprints and layout designs. Pin assignment and signal routing must be revalidated for the new package configuration.