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Logic - Latches

74ABT573APW,112 application field and working principle

Logic latches are electronic circuit components used in digital logic systems to store data temporarily. A logic latch is a two-inputs device which, when set, retains its output until a reset signal is received. It can be classified as a level-sensitive device, meaning that the output state is determined by the current input conditions. A logic latch typically consists of two CMOS inverters connected together in a positive feedback loop so that the output of one inverter is connected to the input of the other.The 74ABT573APW,112 is an 8-bit low-input-capacitance buffer and latch which can be used in a variety of logic circuits. It is an asynchronous device, meaning that the inputs and output are not synchronized with a system clock. The device features three control inputs: Latch Enable (LE), Data In (DI) and Data Out (DO). Each of the eight bits is latched independently, with the least significant bit located at pin 1 and the most significant bit located at pin 8.When LE is high, the data will be latched and whatever data is currently supplied in the DI will be retained in the latch until the LE is set low, at which point the output of the latch will be released and the data will be available at the DO pin. The device is powered by a single 2.5V to 5.5V power supply and can operate over a -55°C to +125°C temperature range.The 74ABT573APW,112 can be used to create synchronous and asynchronous circuits where data can be stored, retrieved and changed quickly. A typical application of a latch like the 74ABT573APW,112 is in a flip flop circuit, where it can be used to store a single bit of data, such as a 1 or a 0. It can also be used in arithmetic circuits, where it can store and release large numbers, as well as in logic circuits, where it can be used to store the results of a calculation or a logical operation.In addition to its simple functionality, the device also has a number of features which make it particularly attractive for use in digital logic circuits. These features include a Schmitt trigger input for improved noise immunity, an active low output enable option, and an integrated power-on reset to ensure reliable startup. It also includes low quiescent power consumption, making it ideal for use in battery operated or otherwise power-constrained systems.In summary, the 74ABT573APW,112 is a robust and versatile 8-bit buffer and latch which is widely employed in digital logic circuits. It is ideal for highest-speed applications and due to its low power consumption, it is also suitable for battery operated systems. Featuring additional features such as Schmitt-trigger input and active-low output enable, it provides greater flexibility and reliability than other similar latch devices.

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