LC4256B-75TN100C

Complex Programmable Logic Devices Overview

The LC4256B-75TN100C is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor's ispMACH 4000B family. It features 256 macrocells organized into 16 Logic Array Blocks (LABs) and provides 64 I/O pins. The device operates within a supply voltage range of 3V to 3.6V and supports system-in-programmability. It is housed in a 100-TQFP package with dimensions of 14x14 mm. The maximum propagation delay is specified at 7.5 ns, supporting operation up to 322 MHz. The component is designed for industrial temperature ranges, typically spanning -40°C to +85°C or +105°C depending on the specific suffix variant.

Complex Programmable Logic Devices Feature Summary

• 256 Macrocells across 16 LABs for high-density logic implementation
• 64 User I/O Pins with flexible input/output configuration
• System-in-Programmability (SIP) capability for field updates
• 7.5 ns maximum propagation delay supporting frequencies up to 322 MHz

Complex Programmable Logic Devices Applications

• High-performance control applications requiring deterministic timing
• Address decoding and data routing in embedded systems
• Interface bridging between legacy protocols and modern digital components
• Boot loader execution for FPGA configuration initialization

Complex Programmable Logic Devices Part Context

This part belongs to the ispMACH 4000B series, which utilizes non-volatile EEPROM technology. Unlike SRAM-based FPGAs, this CPLD executes code immediately upon power-up without external configuration memory. The 'B' suffix denotes the specific generation within the 4000 family, offering improved performance over earlier variants while maintaining pin compatibility with other devices in the same package footprint.

Complex Programmable Logic Devices Replacement Considerations

Direct pin-compatible replacements within the same package include other members of the ispMACH 4000B family such as the LC4256B-75FT256BC (different package) or higher-capacity devices like the LC4512B if more macrocells are required. Verify that the replacement device maintains the same voltage range and speed grade (-75) to ensure signal integrity.