ISPLSI 1048E-50LTN

Complex Programmable Logic Devices Overview

The ispLSI 1048E-50LT is a high-density, in-system programmable logic device (PLD) from Lattice Semiconductor. It utilizes E2CMOS technology to provide 8,000 PLD gates, 96 universal I/O pins, and 288 registers within a non-volatile architecture. The -50 speed grade supports a maximum operating frequency of 90 MHz with a typical propagation delay of 20 ns. Key features include four dedicated clock inputs, two global output enable pins, and TTL-compatible voltage levels. The device operates on a single 5V supply and offers flexible pin placement with programmable output slew rate control.

Complex Programmable Logic Devices Feature Summary

• High Density: Contains 8,000 PLD gates, 48 Generic Logic Blocks (GLBs), and 288 registers.
• In-System Programmability: Supports ISP via a 5V-only serial interface for reprogramming soldered devices.
• Performance: Maximum operating frequency of 90 MHz with a worst-case propagation delay of 20 ns.
• Architecture: Features a Global Routing Pool (GRP) for complete interconnectivity and four dedicated clock input pins.

Complex Programmable Logic Devices Applications

• Complex glue logic replacement
• Address decoding and state machine implementation
• Fast counter designs utilizing wide input gating

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix (-50) corresponds to the required 90 MHz performance and 20 ns delay. Confirm the package type 'LT' indicates the 128-pin Thin Quad Flat Package (TQFP). Ensure design compatibility with the recommended successor model, ispLSI 1048EA, if new procurement is feasible.

Complex Programmable Logic Devices Selection Notes

Select the -50 variant when a 90 MHz maximum frequency and 20 ns propagation delay are sufficient for the system timing requirements. This speed grade offers a balance between performance and power consumption compared to faster grades like -70 or -125. Verify that the 128-pin TQFP package fits the board layout constraints.

Complex Programmable Logic Devices Part Context

The ispLSI 1048E series represents a generation of high-density CPLDs designed to bridge the gap between traditional PLDs and FPGAs. The -50LT specifically denotes the commercial temperature range version packaged in a 128-pin TQFP. It is functionally compatible with the earlier ispLSI 1048C but includes enhanced features such as additional dedicated inputs and global output enables.

Complex Programmable Logic Devices Replacement Considerations

Lattice recommends using the ispLSI 1048EA for new designs. The ispLSI 1048EA is a functional superset with improved performance and features. Direct pin-to-pin replacements may require verification of timing parameters and package availability.