ISPLSI 5256VA-70LB272

Complex Programmable Logic Devices Overview

The ispLSI 5256VA-70LB272 is a high-density, in-system programmable logic device from Lattice Semiconductor. It features 12,000 PLD gates and 256 macrocells within a 272-ball BGA package. Operating on a 3.3V supply with user-selectable 3.3V/2.5V I/O levels, it delivers a maximum operating frequency of 125 MHz and a propagation delay of 7.5 ns. The architecture utilizes SuperWIDE Generic Logic Blocks (GLBs) and a Global Routing Pool for efficient interconnects. Key electrical characteristics include TTL/3.3V/2.5V compatible input thresholds and output drivers capable of sourcing 4mA and sinking 8mA.

Complex Programmable Logic Devices Feature Summary

• SuperWIDE Architecture: 32 GLBs with up to 35 shared product terms per macrocell and 68 inputs per GLB.
• High Performance: E2CMOS technology supports fmax of 125 MHz and tpd of 7.5 ns.
• In-System Programmability: Non-volatile, electrically erasable/reprogrammable via IEEE 1149.1 JTAG interface.
• Flexible I/O: User-selectable 3.3V or 2.5V I/O levels with programmable slew rates, bus hold, and pull-ups.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring fast counters and address decoders.
• High-speed data buffering and protocol bridging in industrial systems.
• Replacement for legacy GAL/CPLD devices in PCB designs requiring reconfigurability.
• Secure boot logic and control interfaces utilizing built-in security features.

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix (-70) matches the required timing constraints of 7.5 ns propagation delay. Confirm the LB272 package designation corresponds to the 272-ball BGA form factor. Ensure design tools support the ispLSI 5000V family for programming and boundary scan testing. Check for end-of-life status as this datasheet dates from 2002.

Complex Programmable Logic Devices Selection Notes

Select this component when 256 macrocells and 192 I/O pins are required in a compact BGA footprint. The -70 speed grade is suitable for applications needing up to 125 MHz performance. Consider the SuperWIDE GLB structure for complex logic functions requiring extensive product term sharing. Verify voltage compatibility if interfacing with both 3.3V and 2.5V domains using the VCCIO pin.

Complex Programmable Logic Devices Part Context

This device belongs to the ispLSI 5000V family, which offers high-density PLD capabilities with non-volatile in-system programmability. It shares architectural similarities with the ispLSI 1000, 2000, and 3000 families but features an enhanced Global Routing Pool and SuperWIDE GLBs for improved pin locking and routing efficiency. It serves as a bridge between traditional CPLDs and modern FPGAs.

Complex Programmable Logic Devices Replacement Considerations

Direct replacements may be limited due to the age of the ispLSI 5000V family. Review Lattice's MachXO3 or ispMACH 4000Z series for equivalent gate counts and I/O flexibility, though pinouts and toolchains will differ significantly. Functional equivalence requires careful timing analysis and resource mapping.