ISPLSI 5256VE-165LT128

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-165LT128 is a high-density, in-system programmable logic device from Lattice Semiconductor's ispLSI 5000VE family. It features 12,000 PLD gates and 256 macrocells organized into eight Generic Logic Blocks (GLBs). The device operates at a maximum frequency of 165 MHz with a propagation delay of 6.0 ns. It utilizes E2CMOS technology for non-volatile configuration and supports 3.3V power supply with user-selectable 3.3V or 2.5V I/O levels. The component includes 256 registers, four dedicated clock pins, and full IEEE 1149.1 boundary scan testability.

Complex Programmable Logic Devices Feature Summary

• High-performance E2CMOS technology supporting 165 MHz operation and 6.0 ns propagation delay
• Architecture comprising 256 macrocells within eight 32-macrocell Generic Logic Blocks (GLBs)
• In-system programmability via IEEE 1149.1 JTAG interface for manufacturing yield improvement
• Flexible I/O configuration allowing independent selection of 3.3V or 2.5V output levels

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 reprogrammable logic for post-manufacturing debugging
• Interfaces between standard 5V TTL devices and lower voltage logic families

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix (-165) matches the required 165 MHz operating frequency. Confirm the LT128 package designation corresponds to the 128-pin Thin Quad Flat Package (TQFP) with 0.4 mm lead pitch. Ensure design tools support the ispLSI 5000VE architecture, noting it is not JEDEC compatible with the older ispLSI 5000VA family.

Complex Programmable Logic Devices Selection Notes

Select this model when designs require 256 registered macrocells and high-speed performance up to 165 MHz. The 128-pin TQFP package is suitable for applications needing 144 I/O pins within a surface-mount form factor. Consider the -165 speed grade only if the system timing budget allows for the specified 6.0 ns propagation delay; slower grades are available for lower power requirements.

Complex Programmable Logic Devices Part Context

This component belongs to the ispLSI 5000VE family, which enhances the previous ispLSI 5000VA series with optimized macrocells and an improved Global Routing Pool (GRP). Unlike the VA series, the VE family removes the T-type flip-flop option and simplifies product term reset logic. It maintains pinout compatibility for programming and power/ground connections despite architectural differences.

Complex Programmable Logic Devices Replacement Considerations

Direct replacements must be from the ispLSI 5000VE family to ensure architectural compatibility. The ispLSI 5256VA is functionally similar but not JEDEC compatible due to macrocell differences. Verify that any substitute part number retains the -165 speed grade and LT128 package type to maintain electrical and physical fit.