DM74LS175N

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The DM74LS175N is a 4-bit D-type Register with three state enable outputs. This register has a latch enable (LE) and an enable (EN) input. It is designed for general purpose storage and data transfer applications and is composed of four identical data flip-flops with outputs connected in parallel.

This device is especially useful in applications where storage of data is required, such as in temporary register storage or intermediate storage of an incoming data word under control of an enable input. Enable inputs LE and EN are provided for easy connection of a multiplexer, with LE input providing data flow in one direction and EN in the other direction.

Application Field:

The DM74LS175N is primarily used in applications requiring register storage and data transfer, such as in data processing systems and as intermediate storage of an incoming data word. Further applications include logic circuits, shift registers, counters, accumulators, RAMs and ROMs. They are also useful in displaying numbers on seven-segment displays, conversion of 8-bit data to 4-bit data, signal control and in data demultiplexing.

Working Principle:

The DM74LS175N uses two inputs: LE and EN. The LE input enables data flow in one direction, while the EN input enables data flow in the other direction. When LE is at its active low state and EN is at its active high state, the DM74LS175N acts as a standard D-Type Register, storing data on each clock cycle. When LE and EN are both in the active high state, the DM74LS175N operates in a three-state mode, which means that data is not transferred and the register output is placed in a high impedance state. This allows multiplexing of data Words, which is useful in applications such as displaying numbers on seven-segment displays.

The data in the DM74LS175N is stored in the form of four latches, which can be set and reset independently. This makes the register ideal for applications such as conversion of 8-Bit data to 4-Bit data, signal control and data demultiplexing. Furthermore, the device itself can be used as a logic circuit, as the four latches are tied together in parallel, and thus the output can be accessed by logic elements such as OR and NOR gates.

The DM74LS175N is a relatively fast device. It features a propagation delay of 55 ns MAX, making it suitable for high-speed applications. Like all digital devices, the DM74LS175N draws very little power, typically ranging from 3.2mA to 10mA.

Conclusion:

The DM74LS175N is an ideal device for applications such as storage and data transfer, logic circuits, shift registers, counters, accumulators, RAMs, ROMs and data demultiplexing. It features two inputs – LE and EN – which allow data to flow in either direction and a fast propagation delay of 55 ns MAX. Furthermore, it draws very little power and is thus suitable for a wide variety of applications.

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