ISPLSI 5256VE-125LT100I

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-125LT100I is a high-density, in-system programmable complex programmable logic device (CPLD) from Lattice Semiconductor. It features 12,000 PLD gates and 256 macrocells organized into eight Generic Logic Blocks (GLBs). The device operates on a 3.3V supply with user-selectable 3.3V or 2.5V I/O levels. It supports a maximum operating frequency of 165 MHz and offers a typical propagation delay of 6.0 ns. The component includes 144 I/O pins, four dedicated clock inputs, and IEEE 1149.1 boundary scan testability. It utilizes E2CMOS technology for non-volatile storage and is housed in a 100-pin TQFP package.

Complex Programmable Logic Devices Feature Summary

• High Density Architecture: Contains 12,000 PLD gates, 256 macrocells, and 256 registers within eight SuperWIDE Generic Logic Blocks.
• High Performance: Achieves up to 165 MHz maximum operating frequency with a 6.0 ns propagation delay using E2CMOS technology.
• Flexible I/O Configuration: Supports user-selectable 3.3V or 2.5V I/O levels via the VCCIO pin, compatible with standard 5V TTL devices.
• In-System Programmability: Features non-volatile EEPROM technology allowing reprogramming of soldered devices via IEEE 1149.1 JTAG interface.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast global interconnect.
• Address decoding and high-speed counter circuits utilizing SuperWIDE input gating.
• Interface bridging between 5V TTL systems and 3.3V/2.5V logic domains.
• Prototyping and low-volume production of digital control logic.

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix (-125) matches the required timing constraints against the datasheet specifications. Confirm that the 100-pin TQFP package dimensions align with the target PCB footprint. Ensure design tools support the ispLSI 5000VE family architecture, noting potential differences from older or newer Lattice families.

Complex Programmable Logic Devices Selection Notes

Select this model when designs require 256 macrocells and high-speed performance up to 165 MHz. The -125 speed grade indicates specific timing characteristics; verify against system clock requirements. Consider the 100-pin TQFP package if board space allows for larger footprints compared to BGA options. Ensure the application leverages the 3.3V core voltage while managing I/O voltage levels appropriately.

Complex Programmable Logic Devices Part Context

This component belongs to the ispLSI 5000VE family, which succeeded the ispLSI 5000VA series. It shares programming and power/ground pin locations with the VA family but differs in JEDEC compatibility and internal architecture optimizations. The 5256VE variant specifically provides the mid-range density of 256 macrocells within the VE product line.

Complex Programmable Logic Devices Replacement Considerations

Direct functional replacement requires matching the 256 macrocell count and 100-pin TQFP package. Verify timing compatibility with the -125 speed grade. Note that the ispLSI 5000VA family is not JEDEC compatible; cross-referencing pinouts and logic resources is necessary for any family migration.