74HC165D

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74HC165D is a logic device that belongs to the Shift Registers family. This device is a synchronous, serial-to-parallel converter which utilizes advanced silicon-gate CMOS technology to store data between shifts. It can store up to 8 data bits on 8 Flip-Flop stages, making it an ideal device for applications that require information to be processed in stages.

The 74HC165D device has two main application fields. Firstly, it can be used as a part of a shift register to convert serial data into parallel data. This makes the 74HC165D suitable for applications such as microcontroller interfacing, data acquisition, communication interface and more. Secondly, it can be used as an 8-bit latch to store data temporarily.

The 74HC165D works by connecting all of the serial data and parallel outputs, and connects the serial input to a shift register clock. The shift register clock\'s job is to perform serial-to-parallel conversion. The shift clock\'s output is connected to the Data Input pin of the 74HC165D. The clock is also connected to the Clock Enable pin to control the data flow.

The first rising edge of the shift clock triggers the Data Input pin of the 74HC165D. When the Data Input pin receives a high-level signal, it triggers the Data Output pin and a high-level signal appears on the Data Output pin. This signal is stored in the internal 8 Flip-Flop stages and can be read out of the latch via the Parallel Outputs. The storage remains boosted until the prior low-level signal appears on the Data Input pin.

The 74HC165D device has a few control pins. These include the Load/Shift, Parallel/Serial Mode, and Clock Enable/Disable pins. The Load/Shift pin determines whether the data is loaded into the 74HC165D (by sending a high-level signal) or shifted serially from the Data Input pin (by sending a low-level signal). In Parallel/Serial Mode, the user can select whether the parallel outputs or serial outputs are placed on the Data Output pin.

The Clock Enable/Disable pin is an active-high input. Its purpose is to enable or disable the shift clock, depending on the user\'s data transferring needs. It should be noted that when the Clock Enable/Disable pin is driven by a low-level signal, no new data is loaded or shifted, but any data that is already stored in the latch remains until it is cleared.

The 74HC165D device is a useful logic device for applications that require data conversion and temporary storage. The flexible control pins make it an ideal device for transferring and storing data between stages. By load and shifting data in synchronization, it can be used for a wide range of applications, including microcontroller interfacing, data acquisition, and communication interfaces.

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