SN74HC165QDRQ1

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Logic-Shift Registers are often used to accomplish a task quickly and easily. The SN74HC165QDRQ1 is an integrated circuit that is part of this category of devices. This component is a parallel-in/serial-out 8-bit asynchronous shift register with built-in logic allowing for cascading or daisy-chaining with other similar devices.

The SN74HC165QDRQ1 will convert 8-bit parallel data into entire 8-bit serial data shift output. The innovation here make the function simpler and reduce component cost by eliminating the factorial circuit of classic serial-in/serial-out type. Overall, it employs the same principles and characteristics of any other shift registers.

The device works by first loading the data from the 8 bytes into the buffer register located internal to the 74HC165QDRQ1. The data is then loaded into the 8-bit storage register which shifts them into the serial-out terminal, Q0. This process continues until all of the data has been processed, each eight bits having been shifted out of the register as 8 serial bits.

Applications for the SN74HC165QDRQ1 include timing applications, computer bus data transmission, semiconductor-to-semiconductor chip interconnections, and other asynchronous data transfer or data reception applications which require the generation of control signals from the shift register\'s outputs. It can also be used as an address decoder to allow multiple ICs on the same bus.

The SN74HC165QDRQ1 has an Enable pin which can be used to inhibit its operation and to allow it to be directly connected to an enable port of a microprocessor, memory, or an expansion bus. The enable pin can be used to prevent data from entering or shifting out of the register when the enable pin is de-asserted. The device also has an asynchronous clear input to reset the shift register.

The SN74HC165QDRQ1\'s output is Low when the loading is enabled. This load input is used to enable the 8-bit storage register. Under normal operation, the Load input is constantly high, so data is always loaded into the register on the parallel data inputs. When the load input is input with a Low, the data present at the parallel inputs is loaded into the 8-bit storage register.

The device also has a shift input that causes the SN74HC165QDRQ1 to take the contents of the 8-bit storage register and to shift it out on its serial output, Q0. If a Low is applied to the shift input, the contents of the 8-bit storage register shifts out through the Q0 output. The data remains in the register until the next rising edge of the shift clock.

In summary, the SN74HC165QDRQ1 is a logic-shift register used to convert 8-bit parallel data into 8-bit serial data shift output. It has an Enable pin, a Load input, and a Shift button to facilitate a shift of data and data loading. The device is primarily used in timing applications, computer bus data transmission, semiconductor-to-semiconductor chip interconnections, and other asynchronous data transfer or data reception.

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