ISPLSI 5256VE-80LF256I

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-80LF256I 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 utilizes E2CMOS technology with a 3.3V core supply and supports user-selectable 3.3V or 2.5V I/O levels via the VCCIO pin. Key electrical specifications include a maximum operating frequency of 165 MHz and a propagation delay as low as 6.0 ns. It integrates 144 I/O pins, four dedicated clock inputs, and full IEEE 1149.1 boundary scan testability.

Complex Programmable Logic Devices Feature Summary

• High Density Architecture: Contains 256 macrocells within eight 32-macrocell Generic Logic Blocks (GLBs) and a Global Routing Pool for efficient signal distribution.
• Flexible I/O Configuration: Supports independent 3.3V or 2.5V output voltage selection per I/O bank while maintaining a single 3.3V core supply.
• In-System Programmability: Allows reprogramming of soldered devices via JTAG interface to improve manufacturing yields and simplify debugging.
• Advanced Timing Performance: Achieves fmax of 165 MHz with a minimum propagation delay of 6.0 ns using high-speed global interconnects.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast global clock distribution.
• Address decoding and high-speed counter circuits utilizing SuperWIDE input gating.
• Systems requiring in-field reconfiguration and non-volatile logic storage.
• Interfaces between standard 5V TTL devices and lower voltage logic families.

Complex Programmable Logic Devices Procurement Notes

Verify that the specific suffix LF256I corresponds to the 256-pin fpBGA package and industrial temperature range (-40°C to +85°C). Confirm that design tools support the ispLSI 5000VE architecture, noting potential differences from the older 5000VA family regarding JEDEC compatibility and feature sets like product term reset logic.

Complex Programmable Logic Devices Selection Notes

Select this component when designs require 256 registered macrocells and high-speed performance under 3.3V power constraints. Ensure the application benefits from the SuperWIDE GLB structure for complex routing. Verify that the 144 available I/O pins meet system interface requirements and that the BGA package footprint is compatible with the PCB layout.

Complex Programmable Logic Devices Part Context

The ispLSI 5256VE belongs to the second-generation SuperWIDE high-density PLD family. It succeeds earlier ispLSI models by offering enhanced pin-locking capabilities and optimized Generic Logic Blocks. This series is designed for applications demanding high logic density, non-volatile configuration, and robust in-system programmability without the complexity of FPGA architectures.

Complex Programmable Logic Devices Replacement Considerations

Direct replacements within the same family include other members of the ispLSI 5000VE series, such as the ispLSI 5128VE, ispLSI 5384VE, or ispLSI 5512VE, depending on macrocell count requirements. Note that the ispLSI 5000VA family is not JEDEC compatible and may have different pinouts or feature availability.

Complex Programmable Logic Devices FAQ

What is the difference between the ispLSI 5000VE and 5000VA families?

The ispLSI 5000VE is not JEDEC compatible with the 5000VA family. The VE family simplifies Product Term Reset Logic, removes the T-type flip-flop option, and eliminates Global Preset and programmable output-delay features to optimize design fit efficiency.

How does the device handle I/O voltage levels?

The device operates on a 3.3V core supply (VCC). Individual I/O pins can be configured for either 3.3V or 2.5V output levels by connecting the VCCIO pin to the desired voltage reference, allowing interoperability with both voltage standards.

Can the device be programmed after soldering?

Yes, the ispLSI 5256VE supports In-System Programming (ISP) via the IEEE 1149.1-compliant JTAG interface, allowing logic and interconnect structures to be reprogrammed without removing the device from the board.