ISPLSI 1048-50LQ

Complex Programmable Logic Devices Overview

The ispLSI 1048-50LQ is a discontinued high-density programmable logic device from Lattice Semiconductor, manufactured using non-volatile E2CMOS technology. It features 8000 PLD gates, 48 Generic Logic Blocks (GLBs), and 288 registers within a 120-pin PQFP package. The device provides 96 universal I/O pins and ten dedicated inputs, supporting in-system programming at 5 volts. Key electrical specifications include a maximum operating frequency of 50 MHz for the industrial grade variant and a typical propagation delay of 15 ns. It operates with a supply voltage range of 4.75V to 5.25V.

Complex Programmable Logic Devices Feature Summary

• High-density architecture with 8000 PLD gates, 48 GLBs, and 288 registers.
• Non-volatile E2CMOS technology enabling electrically erasable and reprogrammable logic.
• In-system programmable (ISP) via 5-volt interface for manufacturing and debugging flexibility.
• TTL-compatible inputs and outputs with 4 mA source and 8 mA sink drive capability.

Complex Programmable Logic Devices Applications

• Complex glue logic replacement in digital systems.
• State machine implementation requiring synchronous and asynchronous clocking.
• Address decoding and fast counter applications utilizing wide input gating.
• Prototyping structured designs before ASIC implementation.

Complex Programmable Logic Devices Procurement Notes

All devices in the ispLSI 1048 family are officially discontinued per Product Change Notification #13-10. Verification of availability should focus on surplus or secondary market sources rather than direct manufacturer distribution. Designers must account for end-of-life status when planning long-term production cycles.

Complex Programmable Logic Devices Selection Notes

Select the -50 speed grade for applications requiring a maximum operating frequency of 50 MHz. Ensure the design utilizes the 120-pin PQFP package format compatible with the specified pinout. Verify that the system power supply strictly adheres to the 4.75V to 5.25V range to maintain TTL compatibility and electrical characteristics.

Complex Programmable Logic Devices Part Context

The ispLSI 1048 belongs to the ispLSI series of complex programmable logic devices. It combines the ease of use of PLDs with the density of FPGAs. The device is organized into six Megablocks, each containing eight GLBs and sixteen I/O cells, interconnected by a Global Routing Pool (GRP) to ensure complete interconnectivity between all logic elements.

Complex Programmable Logic Devices Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation due to the discontinuation status. Designers should evaluate modern Lattice low-power FPGA or CPLD families for functional equivalents, considering differences in I/O voltage levels and programming interfaces.