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M5-128/68-7VC/1 Equivalent & Substitute Parts
Part Overview
The M5-128/68-7VC/1 is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's MACH® 5 series. This device integrates 128 macrocells with 68 I/O pins in a 100-pin LQFP package, delivering 7.5 ns maximum propagation delay for high-speed digital logic applications. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | M5-128/68-7VC/1 |
| Manufacturer | Lattice Semiconductor Corporation |
| Series | MACH® 5 |
| Number of Macrocells | 128 |
| Number of I/O | 68 |
| Delay Time tpd(1) Max | 7.5 ns |
| Voltage Supply - Internal | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Package / Case | 100-LQFP |
| Mounting Type | Surface Mount |
| Programmable Type | In System Programmable |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution of the M5-128/68-7VC/1 is determined by the following critical parameters:
- Macrocell Count: 128 macrocells (functional logic capacity)
- Propagation Delay: 7.5 ns maximum (timing performance)
- Voltage Supply Range: 4.75V ~ 5.25V (power compatibility)
- Operating Temperature Range: 0°C ~ 70°C (thermal envelope)
- Package Type: 100-pin LQFP (physical form factor)
- Programmable Architecture: In System Programmable (ISP) capability
- I/O Pin Count: Minimum 68 I/O pins required
The ATF1508AS-7AX100 from Microchip Technology meets all substitution criteria. This device maintains identical macrocell count, propagation delay, voltage supply range, operating temperature, package configuration, and ISP programmability. The ATF1508AS-7AX100 provides 80 I/O pins, exceeding the 68-pin requirement of the original part, ensuring full functional compatibility with additional I/O capacity.
Parameter Comparison
| Parameter | M5-128/68-7VC/1 | ATF1508AS-7AX100 | Match Status |
|---|---|---|---|
| Number of Macrocells | 128 | 128 | Identical |
| Number of I/O | 68 | 80 | Substitute exceeds requirement |
| Delay Time tpd(1) Max | 7.5 ns | 7.5 ns | Identical |
| Voltage Supply - Internal | 4.75V ~ 5.25V | 4.75V ~ 5.25V | Identical |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | Identical |
| Package / Case | 100-LQFP | 100-TQFP | Equivalent (14x14 mm) |
| Programmable Type | In System Programmable | In System Programmable (min 10K program/erase cycles) | Compatible |
| Mounting Type | Surface Mount | Surface Mount | Identical |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) | Identical |
Engineering Selection Recommendations
The ATF1508AS-7AX100 is the direct functional equivalent for the obsolete M5-128/68-7VC/1. Selection of this substitute is supported by:
- Product Status Alignment: The ATF1508AS-7AX100 is classified as Active, ensuring continued availability and manufacturing support.
- Compliance Advantage: The substitute is ROHS3 compliant, addressing regulatory requirements that the original part does not meet.
- Electrical Equivalence: All critical electrical parameters—macrocell count, propagation delay, voltage supply, and operating temperature—are identical.
- Physical Compatibility: Both devices use 100-pin surface-mount packages with identical 14x14 mm footprints, enabling direct PCB layout compatibility.
- I/O Capacity: The 80 I/O pins of the substitute provide additional design flexibility beyond the 68-pin requirement of the original part.
- Inventory Availability: The ATF1508AS-7AX100 maintains substantial stock levels (3154 units), supporting immediate procurement.
Frequently Asked Questions (FAQ)
Q: Can the ATF1508AS-7AX100 directly replace the M5-128/68-7VC/1 on existing PCBs?
A: Yes. Both devices use identical 100-pin LQFP packages with 14x14 mm footprints. Pin-to-pin compatibility is maintained for all functional signals. The substitute's 80 I/O pins accommodate the original part's 68-pin requirement without modification.
Q: Are there timing differences between these devices?
A: No. Both devices specify 7.5 ns maximum propagation delay (tpd). Timing performance is equivalent for all logic operations.
Q: What is the significance of the ATF1508AS-7AX100 having 80 I/O pins versus 68?
A: The additional 12 I/O pins provide design flexibility for future enhancements or alternative signal routing. Existing designs using 68 I/O pins operate without constraint; unused pins remain unconnected.
Q: Does the substitute support in-system programming like the original part?
A: Yes. The ATF1508AS-7AX100 is In System Programmable with a minimum of 10,000 program/erase cycles, supporting field updates and reconfiguration identical to the original part.
Q: What compliance advantages does the substitute offer?
A: The ATF1508AS-7AX100 is ROHS3 compliant, whereas the M5-128/68-7VC/1 is RoHS non-compliant. This addresses regulatory requirements for new designs and systems subject to RoHS directives.
Q: Are voltage supply requirements identical?
A: Yes. Both devices operate within the 4.75V ~ 5.25V internal supply range and share identical operating temperature specifications (0°C ~ 70°C).
Q: What is the moisture sensitivity classification?
A: Both devices are classified as MSL 3 with a 168-hour moisture sensitivity window, requiring identical handling and storage protocols.
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