ISPLSI 2128E-135LT176

Complex Programmable Logic Devices Overview

The ispLSI 2128E-135LT176 is a high-density, in-system programmable logic device (PLD) from Lattice Semiconductor. It features 6000 PLD gates, 128 universal I/O pins, and 128 registers within 32 Generic Logic Blocks (GLBs). Built on E2CMOS technology, the -135 speed grade supports a maximum operating frequency of 135 MHz with a propagation delay of 7.5 ns. The device operates with a 5V logic core and supports user-selectable 3.3V or 5V I/O levels. It includes three dedicated clock inputs, two global output enable pins, and eight dedicated input pins, all interconnected via a Global Routing Pool.

Complex Programmable Logic Devices Feature Summary

• High Density: 6000 PLD gates, 128 I/Os, and 128 registers.
• Performance: 135 MHz max frequency with 7.5 ns propagation delay.
• Mixed Voltage: User-selectable 3.3V or 5V I/O for mixed-voltage systems.
• In-System Programmability: Supports JTAG (IEEE 1149.1) programming.

Complex Programmable Logic Devices Applications

• Complex glue logic replacement
• Address decoding and state machines
• Fast counters implementation

Complex Programmable Logic Devices Procurement Notes

Verify the specific speed grade suffix (-135) matches the required 135 MHz performance specification. Confirm the package type LT176 corresponds to the 176-pin TQFP form factor. Ensure the design toolchain supports the ispLSI family for programming and verification.

Complex Programmable Logic Devices Selection Notes

Select this component for designs requiring high pin count and moderate speed. The -135 grade offers a balance between speed and power compared to the -180 or -100 variants. Consider the 3.3V/5V I/O flexibility when interfacing with different voltage domains in mixed-signal systems.

Complex Programmable Logic Devices Part Context

This device belongs to the ispLSI 2128E family, which is upward compatible with the non-E ispLSI 2128 devices. It utilizes E2CMOS technology for non-volatile reprogrammability. The family is designed to combine the ease of use of PLDs with the density of FPGAs.

Complex Programmable Logic Devices Replacement Considerations

The ispLSI 2128E is electrically and functionally upward compatible with the standard ispLSI 2128. Designers migrating from the non-E version can typically use this part as a drop-in replacement without schematic changes.

Complex Programmable Logic Devices FAQ

What is the difference between the -135 and -180 speed grades?

The -180 grade has a maximum operating frequency of 180 MHz and a propagation delay of 5.0 ns, while the -135 grade has a maximum frequency of 135 MHz and a propagation delay of 7.5 ns.

Can the ispLSI 2128E operate with both 3.3V and 5V I/Os simultaneously?

No, all VCCIO pins must be connected to the same voltage level. However, the device allows user selection between 3.3V and 5V I/O standards to match system requirements.

How many dedicated clock inputs does the device have?

The ispLSI 2128E has three dedicated clock input pins (Y0, Y1, and Y2) that can be selected on a GLB basis.