LC4256B-5FT256AC

Complex Programmable Logic Devices Overview

The LC4256B-5FT256AC is a Complex Programmable Logic Device (CPLD) belonging to the ispMACH 4000 family. It features 256 macrocells and supports In-System Programming via JTAG. The device operates with supply voltages of 3.3V, 2.5V, or 1.8V for I/O interfaces. Key electrical parameters include a maximum propagation delay of 5 ns and a maximum operating frequency of 400 MHz. It is housed in a 256-pin FineLine BGA package and supports commercial temperature ranges.

Complex Programmable Logic Devices Feature Summary

• 256 Macrocells with enhanced functionality including individual clock, reset, preset, and clock enable controls per macrocell.
• High performance with a maximum propagation delay of 5 ns and maximum operating frequency of 400 MHz.
• Supports multiple voltage levels: 3.3V, 2.5V, and 1.8V LVCMOS I/O standards.
• In-System Programmability (ISP) capability allowing updates without removing the device from the circuit.

Complex Programmable Logic Devices Applications

• High-density logic replacement in industrial control systems.
• Address decoding and bus bridging in embedded systems.
• State machine implementation for automated manufacturing equipment.
• Interface translation between different voltage domains in consumer electronics.

Complex Programmable Logic Devices Procurement Notes

Verify the specific suffix 'A' against the manufacturer's datasheet to confirm if it denotes an extended temperature range or specific packaging variant, as standard LC4256B devices typically cover commercial temperatures. Ensure the 256-pin FBGA footprint matches the target PCB design constraints. Confirm RoHS compliance status for the specific production batch.

Complex Programmable Logic Devices Selection Notes

Select this component when designs require high pin counts and moderate logic density within a compact BGA footprint. Compare against the LC4256V series if lower power consumption is critical, as the V-series offers reduced static power. Verify that the 5 ns speed grade meets the timing requirements of the target application logic.

Complex Programmable Logic Devices Part Context

This part belongs to the Lattice ispMACH 4000 family, which bridges the gap between simple PLDs and complex FPGAs. The family is characterized by non-volatile configuration, allowing instant-on operation. The LC4256B variant specifically targets applications needing robust logic capacity with established ISP infrastructure.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same package may include other members of the ispMACH 4000 family with similar macrocell counts, such as the LC4256V-5FT256C, provided voltage and speed grades are compatible. Always verify electrical characteristics before substitution.