LC4256B-5F256BI

Complex Programmable Logic Devices Overview

The LC4256B-5F256BI is a Complex Programmable Logic Device (CPLD) belonging to the Lattice ispMACH 4000B family. It features 16 macrocells and 256 usable macrocells for logic implementation, housed in a 256-pin FineLine BGA package. The device supports system-in-programmability (ISP) via JTAG and operates with an internal supply voltage range of 3V to 3.6V. Key electrical specifications include a maximum propagation delay of 5 ns and an operating temperature range of -40°C to +85°C.

Complex Programmable Logic Devices Feature Summary

• ispMACH 4000B architecture providing non-volatile configuration retention
• System-in-programmability capability allowing field updates via JTAG
• High-density I/O with 192 available pins in a 256-pin FBGA package
• Low power consumption suitable for battery-operated applications

Complex Programmable Logic Devices Applications

• Protocol conversion between legacy and modern interface standards
• Address decoding and bus bridging in embedded systems
• State machine implementation for industrial control logic
• Glue logic replacement in mixed-signal designs

Complex Programmable Logic Devices Procurement Notes

Verify the specific suffix 'BI' against official Lattice documentation to confirm the extended industrial temperature grade (-40°C to +85°C). Ensure that the 256-pin FineLine BGA footprint matches the target PCB design constraints. Confirm RoHS compliance status for the specific manufacturing lot prior to integration.

Complex Programmable Logic Devices Selection Notes

Select this component when non-volatile storage is required without external flash memory. Compare the 256 macrocell capacity against project requirements; if higher density is needed, consider the LC4512V series. Verify that the 5 ns speed grade meets the timing constraints of the target clock frequencies.

Complex Programmable Logic Devices Part Context

This part is part of the ispMACH 4000B family, which succeeded the earlier ispMACH 4000A series. It offers improved performance and lower power compared to previous generations while maintaining pin-to-pin compatibility with certain legacy devices. The family is designed for cost-sensitive applications requiring moderate logic density.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same package may be limited. Check for LC4256B variants with different speed grades or temperature ranges. For upward migration, evaluate the LC4512V series for increased macrocell count.