ISPLSI 5256VE-125LF256I

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-125LF256I is a high-density, in-system programmable logic device from the Lattice ispLSI 5000VE family. 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 up to 144 I/O pins and includes 256 registers. Key electrical specifications include a maximum operating frequency of 165 MHz and a propagation delay of 6.0 ns. The component utilizes E2CMOS technology for non-volatile storage and offers 10,000 erase/reprogram cycles.

Complex Programmable Logic Devices Feature Summary

• High Density Architecture: Contains 12,000 PLD gates, 256 macrocells, and 8 GLBs with SuperWIDE generic logic blocks.
• In-System Programmability: Supports IEEE 1149.1 boundary scan testing and reprogramming via JTAG interface.
• Flexible I/O Configuration: User-selectable 3.3V or 2.5V output levels with independent VCCIO reference.
• High Performance: Achieves fmax of 165 MHz and tpd of 6.0 ns using E2CMOS technology.

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 field updates via JTAG.
• Interface bridging between standard 5V TTL devices and 3.3V/2.5V logic families.

Complex Programmable Logic Devices Procurement Notes

Verify that the specific ordering suffix LF256 corresponds to the 256-pin fpBGA package type as defined in the datasheet package options. Confirm the -125 speed grade matches the required 6.0 ns propagation delay and 165 MHz frequency targets for the design. Ensure programming hardware supports the IEEE 1149.1 JTAG interface for in-system configuration.

Complex Programmable Logic Devices Selection Notes

Select this device when designs require high pin counts (up to 144) combined with substantial logic density (256 macrocells). The 5000VE family is suitable for applications needing flexible I/O voltage translation between 3.3V and 2.5V domains. Consider the 256 fpBGA package if space efficiency and thermal performance are priorities over the TQFP options.

Complex Programmable Logic Devices Part Context

The ispLSI 5256VE belongs to the second-generation SuperWIDE high-density PLD family. It shares architectural similarities with the ispLSI 5000VA but removes certain features like T-type flip-flops and programmable output-delay skew to optimize fit efficiency. It is not JEDEC compatible with the VA series, though power and ground pin locations remain consistent across packages.

Complex Programmable Logic Devices Replacement Considerations

Direct functional replacements within the same family include the ispLSI 5128VE (128 macrocells), ispLSI 5384VE (384 macrocells), and ispLSI 5512VE (512 macrocells). Pinouts may differ between these members even in identical packages; verify pin compatibility carefully before substitution.