LC4256B-5TN176I

Complex Programmable Logic Devices Overview

The LC4256B-5TN176I is a Complex Programmable Logic Device (CPLD) from the ispMACH 4000B family, manufactured by Lattice Semiconductor. It features 256 macrocells and supports up to 96 I/Os within a 176-pin Thin Quad Flat Package (TQFP). The device operates at a maximum frequency of 322 MHz with a typical propagation delay of 5 ns. Designed for high-density applications, it utilizes In-System Programmability (ISP) via JTAG. The component functions on a 3.3 V supply voltage and is rated for industrial temperature ranges.

Complex Programmable Logic Devices Feature Summary

• 256 Macrocells with high-speed performance up to 322 MHz
• Supports up to 96 user I/Os in a 176-pin TQFP package
• In-System Programmability (ISP) capability via JTAG interface
• Industrial temperature range operation (-40°C to +85°C)

Complex Programmable Logic Devices Applications

• High-density logic replacement in industrial control systems
• Protocol conversion and bus bridging in communication equipment
• Address decoding and glue logic in embedded computing platforms

Complex Programmable Logic Devices Part Context

This component belongs to the ispMACH 4000B family, an evolution of the popular ispMACH 4000 series. The 'B' suffix denotes the second generation, offering improved speed and density over the original 'V' series while maintaining pin compatibility with certain legacy designs. It serves as a non-volatile CPLD solution for designers requiring deterministic timing and low power consumption.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same package include the LC4256V-5TN176I, though the V-series may have slightly lower maximum frequencies. For upgraded performance, the LC4256B-7TN176I offers a slower speed grade but similar functionality. Designers should verify timing constraints when substituting between speed grades.