ISPLSI 5256VE-125LF256

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-125LF256 is a high-density, in-system programmable logic device from the Lattice ispLSI 5000VE family. It features E2CMOS technology with 12,000 PLD gates and 256 macrocells organized into eight Generic Logic Blocks (GLBs). The device supports up to 144 I/O pins and operates on a single 3.3V supply. Key electrical specifications include a maximum operating frequency of 165 MHz and a propagation delay of 6.0 ns. It offers user-selectable 3.3V or 2.5V I/O levels via an independent VCCIO pin.

Complex Programmable Logic Devices Feature Summary

• Second-generation SuperWIDE architecture with 8 GLBs containing 32 registered macrocells each.
• E2CMOS non-volatile technology enabling in-system programming via IEEE 1149.1 Boundary Scan.
• High-speed performance with fmax = 165 MHz and tpd = 6.0 ns.
• Programmable speed/power optimization for product terms to balance performance and power consumption.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast global interconnect.
• Address decoding and high-speed counter circuits utilizing SuperWIDE input gating.
• Systems requiring in-circuit debugging and reprogramming capabilities.
• Interfaces between standard 5V TTL devices and 3.3V/2.5V logic domains.

Complex Programmable Logic Devices Procurement Notes

Verify that the LF256 suffix corresponds to the 256-pin fpBGA package option as specified in the datasheet package matrix. Confirm the -125 speed grade matches the required 6.0 ns propagation delay specification. Ensure design files are compatible with the ispLSI 5000VE architecture, noting it is not JEDEC compatible with the older ispLSI 5000VA family.

Complex Programmable Logic Devices Selection Notes

Select this component when designs require 256 macrocells and high-speed routing efficiency. The SuperWIDE GLB structure provides 68 inputs per block for complex logic functions. Consider the 256 fpBGA package for PCB space efficiency if the design requires up to 144 I/Os. Verify thermal management requirements, as power consumption scales with the number of active product terms and operating frequency.

Complex Programmable Logic Devices Part Context

This part belongs to the ispLSI 5000VE family, which enhances the previous 5000VA series with optimized macrocells and improved pin-locking through the Global Routing Pool. Unlike the VA series, the VE family removes T-type flip-flop options and programmable output-delay skew features to improve design fit efficiency while maintaining non-volatile in-system programmability.

Complex Programmable Logic Devices Replacement Considerations

The ispLSI 5256VE is not functionally or pinout-compatible with the ispLSI 5000VA family due to architectural differences in macrocell configuration and product term sharing. Direct replacement requires redesigning the logic implementation and verifying package footprint compatibility.