LC4256B-5T176C

Series:	ispMACH® 4000B
Packaging:	Tray
Part Status:	Obsolete
Programmable Type:	In System Programmable
Delay Time tpd(1) Max:	5.0ns
Voltage Supply - Internal:	2.3 V ~ 2.7 V
Number of Logic Elements/Blocks:	16
Number of Macrocells:	256
Number of I/O:	128
Operating Temperature:	0°C ~ 90°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	176-LQFP
Supplier Device Package:	176-TQFP (24x24)
Base Part Number:	LC4256

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Introduction to Embedded-CPLDs

Complex Programmable Logic Devices (CPLDs) form a key component in the embedded systems industry, providing a bridge between the simple, hardwired logic circuits of the past and the increasingly complex state machines used in modern systems. CPLDs enable the integration of complex functionality within a single, standardised package, providing a powerful alternative to microprocessors, memory, and other discrete logic components.The LC4256B-5T176C is a typical example of an Embedded-CPLD. It is a single-chip device which combines 178 configurable and interconnected blocks, each comprising up to 24 levels of combinatorial logic gates, along with 36 dedicated I/O pins. The LC4256B-5T176C also offers internal RAM and ROM, along with counters and simple shift registers. This provides an unprecedented level of integration for embedded systems designers, who often have limited space available for their hardware.

Application Field of the LC4256B-5T176C

The LC4256B-5T176C is suitable for a wide range of applications. In industrial and automotive systems, it can be used to bridge the gap between factory automation equipment, motor controllers, and other discrete logic components. It is also ideal for use in consumer electronics, such as TV satellite receivers, where it can implement complex signal processing functions.The LC4256B-5T176C is also well suited to small form-factor designs. Its small size and convenient packaging make it particularly suitable for use in computers, peripherals, and hand-held electronics. In addition, the device offers a considerable reduction in power consumption compared to traditional discrete logic, meaning it is perfect for battery-powered systems.

Working Principle of the LC4256B-5T176C

At the heart of the device is the PLD, or Programmable Logic Device. This is a specially-designed integrated circuit which can be programmed to perform a wide range of different logical operations.The PLD works by comparing the input signals that are present at its various ‘inputs’ with the values ‘set’ at its outputs. Each time it detects a match between the two sets, it generates an appropriate output signal, as defined by its programming.In the case of the LC4256B-5T176C, all of the logic operations are programmed into the device, so there is no need to modify any of the underlying circuitry. This makes the device ideal for applications where re-programming is not an option, such as industrial automation and consumer electronics.

Conclusion

The LC4256B-5T176C is an example of a Complex Programmable Logic Device, or CPLD, and is a powerful alternative to traditional logic circuits and memories. Its 178 configurable and interconnected blocks and 36 dedicated I/O pins make it ideal for use in compact embedded systems, and its wide range of applications demonstrate its versatility. All of the logic operations can be programmed into the device, making it ideal for applications where re-programming is not an option. The LC4256B-5T176C is an excellent choice for designers looking for an integrated component which combines versatility, performance, and low power consumption.

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