ISPLSI 5256VE-125LT128

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-125LT128 is a high-density, in-system programmable logic device from Lattice Semiconductor's ispLSI 5000VE family. It features 256 macrocells and supports up to 144 I/O pins within a 128-pin TQFP package. The device operates on a 3.3V supply with user-selectable 3.3V or 2.5V I/O levels. Key electrical specifications include a maximum operating frequency of 165 MHz and a propagation delay of 6.0 ns. It utilizes E2CMOS technology for non-volatile configuration and includes 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
• In-system programmability via IEEE 1149.1 JTAG interface for manufacturing yield improvement and debugging
• Generic Logic Blocks (GLBs) with Product Term Sharing Array allowing up to 35 product terms per function
• Programmable speed/power optimization for individual product term groups to balance performance and power consumption

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast counters and address decoders
• Systems requiring reprogrammable logic for post-manufacturing field updates
• Interfaces between standard 5V TTL devices and 3.3V/2.5V logic families
• Applications necessitating boundary scan testing for PCB assembly verification

Complex Programmable Logic Devices Procurement Notes

Verify the specific suffix 'LT128' corresponds to the 128-pin Thin Quad Flat Package (TQFP) with 0.4 mm lead pitch as documented in the datasheet pin configurations. Confirm that the '-125' speed grade matches the required 6.0 ns propagation delay specification for the target design timing constraints.

Complex Programmable Logic Devices Selection Notes

Select this component when designs require high density (256 macrocells) combined with in-system reprogrammability. Ensure the application can accommodate the 3.3V core voltage while managing the separate VCCIO supply for I/O levels. Consider the 128-pin TQFP footprint if space allows, noting that BGA options are available for higher I/O counts in smaller footprints.

Complex Programmable Logic Devices Part Context

This device belongs to the second-generation SuperWIDE ispLSI 5000VE family. It shares architectural similarities with the ispLSI 5000VA but removes certain features like the T-type flip-flop option and programmable output-delay skew to optimize efficiency. It is not JEDEC compatible with the VA series due to these architectural differences, although pinouts for programming and power remain consistent across packages.

Complex Programmable Logic Devices Replacement Considerations

Direct replacement with ispLSI 5000VA devices is not guaranteed due to architectural differences and lack of JEDEC compatibility. Verify pinout compatibility for specific packages before substitution. Other Lattice PLD families such as ispMACH 4000 offer different architectures and may require significant design retargeting.