LC5256MB-5F256C Equivalent & Substitute Parts

Part Overview

The LC5256MB-5F256C is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispXPLD® 5000MB series. This device features 256 macrocells, 141 I/O pins, and a maximum propagation delay of 5 ns, housed in a 256-pin BGA package. The product is classified as obsolete, necessitating identification of functionally compatible alternatives for new designs and ongoing system support.

Substiute Parts

LC5256MB-5F256C

Lattice Semiconductor CorporationIn Stock: 1794LC5256MB-5F256C Datasheet

Current PartRFQ

LCMXO2-1200UHC-6FTG256I

Lattice Semiconductor CorporationIn Stock: 1141LCMXO2-1200UHC-6FTG256I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC5256MB-5F256C is determined by the following critical parameters:

• Package Compatibility: Both devices must use 256-pin BGA packaging (17x17 footprint) to ensure PCB-level compatibility
• I/O Pin Count: The substitute must provide sufficient I/O pins to accommodate the original design's signal routing requirements
• Logic Capacity: The substitute must meet or exceed the macrocell or logic element count to support the original design's functional complexity
• Voltage Supply Range: The substitute's supply voltage must be compatible with the system's power distribution architecture
• Operating Temperature Range: The substitute must support the thermal environment of the target application
• Programmability: Both devices must support in-system programming capability
• Product Status: Active product status ensures ongoing availability and manufacturer support

The LCMXO2-1200UHC-6FTG256I qualifies as a substitute based on these parameters, offering enhanced logic capacity, expanded I/O capability, and active product status with modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LCMXO2-1200UHC-6FTG256I is the qualified substitute for the obsolete LC5256MB-5F256C. Selection of this alternative is justified by:

• Product Availability: The substitute maintains active product status with manufacturer support, ensuring long-term supply chain stability
• Regulatory Compliance: The LCMXO2-1200UHC-6FTG256I meets ROHS3 compliance requirements, addressing modern environmental and regulatory standards that the original device does not satisfy
• Package Compatibility: Both devices utilize identical 256-pin BGA packaging (17x17 footprint), enabling direct PCB-level substitution without layout modifications
• Enhanced Capability: The substitute provides 1280 logic elements and 206 I/O pins, exceeding the original device's 256 macrocells and 141 I/O pins, ensuring functional compatibility with existing designs
• Thermal Range: The expanded operating temperature range (-40°C to 100°C) accommodates broader application environments compared to the original specification (0°C to 90°C)
• In-System Programmability: Both devices support in-system programming, maintaining design flexibility and field reconfiguration capability

Frequently Asked Questions (FAQ)

Q: Can the LCMXO2-1200UHC-6FTG256I be used as a direct replacement for the LC5256MB-5F256C?

A: Yes, the LCMXO2-1200UHC-6FTG256I is compatible as a substitute. Both devices use identical 256-pin BGA packaging (17x17 footprint), enabling direct PCB-level substitution. The substitute provides greater logic capacity (1280 logic elements versus 256 macrocells) and additional I/O pins (206 versus 141), ensuring functional compatibility with designs originally targeting the LC5256MB-5F256C.

Q: What are the key differences in electrical specifications?

A: The primary electrical differences are the supply voltage range and operating temperature range. The LC5256MB-5F256C operates at 2.3V to 2.7V internal supply, while the LCMXO2-1200UHC-6FTG256I operates at 2.375V to 3.465V. The substitute supports an extended operating temperature range of -40°C to 100°C compared to the original's 0°C to 90°C specification.

Q: Are there compliance differences between these devices?

A: Yes. The LC5256MB-5F256C is RoHS non-compliant, while the LCMXO2-1200UHC-6FTG256I is ROHS3 compliant. For applications requiring modern environmental compliance certifications, the substitute is the appropriate choice.

Q: Does the substitute support in-system programming like the original?

A: Yes, both devices support in-system programmability, maintaining design flexibility and field reconfiguration capability.

Q: What is the impact of the increased I/O pin count?

A: The substitute provides 206 I/O pins compared to the original's 141 pins. This additional I/O capacity does not create compatibility issues; designs utilizing fewer I/O pins can operate without modification, while new designs can leverage the expanded I/O capability.

Q: Are there any package or footprint considerations?

A: Both devices use 256-pin BGA packaging with identical 17x17 footprint dimensions. No PCB layout modifications are required for substitution.