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Logic - Latches

As part of the 74xx family of integrated circuits, the 74ACT573MTC is a latched register chip containing two 32-bit registers and two asynchronous clear inputs. It is used as a temporary storage medium in computer systems, containing data until processing can be completed. This article is an overview of the application field and working principle of the 74ACT573MTC register.

Application Field

The 74ACT573MTC is a logic-level latch which is intended for medium speed, low power applications in wide range of logic designs. It contains two 32-bit registers, each capable of storing up to 15 bits of data. The 74ACT573MTC is used for temporary data storage in a variety of computer systems including embedded designs, microprocessor-based systems, and FPGAs. It is also commonly used in combinational logic circuits, providing fast access to data.

Working Principle

The 74ACT573MTC contains two asynchronous clear inputs, CLEARL and CLEARR, that are used to clear the registers. When high logic levels are applied to these inputs, the registers are cleared to their all zeros states. If either clear input is left open, the registers will remain in their currently active state. When the clear inputs are low, the registers cannot be cleared due to the open-collector nature of the 74ACT573MTC. They must be connected to a logic 0 level in order for the clear operation to take effect.

The 74ACT573MTC is further comprised of two data inputs and two data outputs, labeled DINL and DINR, and DOUTL and DOUTR. When a new set of data is presented on the data inputs, the chip will store it in the registers. As long as the clear inputs are both low, the stored data will remain in the registers until new data is applied to the inputs or the registers are cleared.

To read the data stored in a register, the contents of the register must first be enabled by the appropriate ENABLEp input, either ENABLEL or ENABLER. Once enabled, the data will be presented on the corresponding data output. The 74ACT573MTC also contains an UNUSED input, which is not typically connected to the data bus. This input is used to ensure the ENABLEp lines are connected to a logic 0 level if not enabled, preventing the data from being output.

Conclusion

The 74ACT573MTC is a versatile latched register chip used to store and transfer data in a variety of logic designs. It is a member of the 74xx family and contains two 32-bit registers, two asynchronous clear inputs, two data inputs, and two data outputs. Through its clear and enable inputs, the 74ACT573MTC is capable of storing and retrieving data on demand while still keeping low-level power consumption and medium speeds.

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