ISPLSI 5256VE-100LT100

Complex Programmable Logic Devices Overview

The ispLSI 5256VE is a second-generation SuperWIDE high-density in-system programmable logic device from Lattice Semiconductor. Operating on a 3.3V supply, it features 12,000 PLD gates and 256 macrocells organized into eight Generic Logic Blocks (GLBs). The architecture includes a Global Routing Pool for high-speed interconnect and supports up to 144 I/O pins with user-selectable 3.3V or 2.5V levels. Utilizing E2CMOS technology, the device achieves a maximum operating frequency of 165 MHz with a propagation delay as low as 6.0 ns. It offers non-volatile reprogrammability via IEEE 1149.1 Boundary Scan.

Complex Programmable Logic Devices Feature Summary

• SuperWIDE Architecture: Eight GLBs with 32 macrocells each, featuring a Product Term Sharing Array supporting up to 35 product terms per function.
• High Performance: E2CMOS technology delivers fmax of 165 MHz and tpd of 6.0 ns.
• Flexible I/O: Supports 144 I/O pins with independent VCCIO selection for 3.3V or 2.5V output levels.
• In-System Programmability: Non-volatile Flash-based programming allows reconfiguration without removing the device from the PCB.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast counters and address decoders.
• High-speed interface bridging between standard 5V TTL devices and 3.3V/2.5V systems.
• Prototyping and final production designs requiring field-upgradable logic functions.

Complex Programmable Logic Devices Procurement Notes

Verify package availability for the ISPLSI 5256VE-100LT100 variant, specifically the 100-pin TQFP configuration. Confirm that design tools support the ispLSI 5000VE family, noting potential compatibility differences with the older ispLSI 5000VA series due to architectural changes in the macrocell and routing structure.

Complex Programmable Logic Devices Selection Notes

Select the -100 speed grade for applications requiring a maximum frequency of 165 MHz. Ensure the design utilizes the dedicated clock inputs (CLK0-CLK3) effectively, as CLK0 provides the lowest skew. Consider the 100 TQFP package only if pin count requirements fit within its 72 I/O limit; otherwise, larger packages like 256 fpBGA are necessary for higher I/O counts.

Complex Programmable Logic Devices Part Context

The ispLSI 5256VE belongs to the ispLSI 5000VE family, which succeeded the ispLSI 5000VA series. It shares similar power and ground pin locations but is not JEDEC compatible with the VA series due to optimized macrocells and simplified reset logic. This family bridges the gap between lower-density CPLDs and high-end FPGAs, offering dense logic in a compact form factor.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same density class include other members of the ispLSI 5000VE family, such as the ispLSI 5128VE or ispLSI 5384VE, provided the I/O count and macrocell requirements align. Note that functional equivalence with the ispLSI 5000VA series is not guaranteed due to architectural differences.