ISPLSI 5256VE-100LT128

Complex Programmable Logic Devices Overview

The ispLSI 5256VE-100LT128 is a high-density, in-system programmable logic device from the Lattice ispLSI 5000VE family. It features 12,000 PLD gates and 256 macrocells within SuperWIDE Generic Logic Blocks. The -100 speed grade supports a maximum operating frequency of 165 MHz with a propagation delay of 6.0 ns. Powered by a single 3.3V supply, it offers user-selectable 3.3V or 2.5V I/O levels via an independent VCCIO pin. The LT128 suffix indicates a 128-pin Thin Quad Flat Package (TQFP) with 0.4 mm lead pitch, providing up to 144 I/O pins.

Complex Programmable Logic Devices Feature Summary

• SuperWIDE Architecture: 256 macrocells organized into eight 32-macrocell Generic Logic Blocks (GLBs) with a Global Routing Pool for fast interconnect.
• High Performance: E2CMOS technology achieves fmax = 165 MHz and tpd = 6.0 ns at 3.3V.
• Flexible I/O: Supports TTL/3.3V/2.5V compatible thresholds; output drivers source 4mA and sink 8mA.
• In-System Programmability: Non-volatile configuration allows reprogramming via IEEE 1149.1 JTAG boundary scan interface.

Complex Programmable Logic Devices Applications

• Complex state machine implementations requiring high-speed global clocking.
• Address decoding and counter circuits utilizing SuperWIDE Input Gating.
• Interface bridging between 5V TTL legacy systems and modern 3.3V/2.5V logic.
• Prototyping and final production designs requiring field reconfigurability.

Complex Programmable Logic Devices Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product status documentation. The ispLSI 5000VE family is a mature product line; confirm availability and any potential lifecycle notices such as discontinuance or alternate assembly qualifications before procurement.

Complex Programmable Logic Devices Selection Notes

Select the -100 speed grade for designs requiring 165 MHz operation. Ensure the design fits within the 12,000 gate capacity and 256 macrocell limit. For designs needing lower power consumption, utilize the fuse-selectable speed/power tradeoff settings available on the product terms.

Complex Programmable Logic Devices Part Context

This component belongs to the ispLSI 5000VE family, which succeeded the ispLSI 5000VA series. While pinouts are similar, the 5000VE family removes certain features like T-type flip-flops and programmable output-delay skew, making it distinct from earlier generations despite physical compatibility.

Complex Programmable Logic Devices Replacement Considerations

Direct functional replacements within the same package may include other members of the ispLSI 5000VE family, such as the ispLSI 5128VE or ispLSI 5384VE, provided they support the required I/O count and timing constraints. Note that these devices have different gate counts and macrocell distributions.

Complex Programmable Logic Devices FAQ

What is the difference between VCC and VCCIO?

VCC powers the internal logic array, while VCCIO provides the reference voltage for the I/O output drivers. This allows individual I/Os to operate at either 3.3V (connected to VCC) or 2.5V (connected to VCCIO).

How many dedicated clock pins are available?

There are four dedicated clock input pins: CLK0 and CLK1 are dedicated pins, while CLK2 and CLK3 can be shared with general-purpose I/O pins.

Is the device electrically erasable?

Yes, the ispLSI 5256VE is non-volatile and electrically erasable/reprogrammable up to 10,000 cycles using the JTAG interface.