SN74HC165D

The SN74HC165D is a parallel-input/serial-output shift register that is categorized as a logic - shift register. It is useful in applications that require the input of eight signals simultaneously and the output of serialized versions of these signals, one at a time.

Widely used in logic circuits, the SN74HC165D is an 8-bit, zero serial-to-parallel shift register. It is able to recognize logic high and low levels, enabling it to store 8 bits of information simultaneously. Its mode enables the device to shift bits in the direction of its serial output while using its parallel input/output line as a parallel data load port.

The SN74HC165D is made up of eight toggle flip flops, a parallel load input (PLI), an enable input (EI), and a clock input (Clock). It operates under two different modes - the parallel load mode wherein a logic low signal enters through the Enable input (EI) and Parallel Load Input (PLI) pads, and is shifted into the storage element after a logic high pulse is sent to the clock. The clock triggers the register of the SN74HC165D, which in turn shifts all of the data stored within it one data bit to the right.

The SN74HC165D also has a serial load mode, which is triggered when a logic high signal is sent through the EI and the PLI pads. In this mode, the SN74HC165D shifts the data stored in its storage element one bit to the left. This allows data to be shifted into the register, or loaded, bit by bit. After every high pulse is sent to the clock, the register shifts the data stored in its storage element one bit to the left. The SN74HC165D can receive up to eight bits of data through this method and the input is usually used for data loading purposes.

The output of the SN74HC165D is in serial form, LSB first. All outputs are active when the enable input is at logical high. All outputs are in a high-impedance state when the enable input is at a low logic level. It is important to note that the serial output of the SN74HC165D is in two’s complement form, making it important for the user to understand how two’s complement works.

The SN74HC165D is popular in various electronic electronics applications, such as those involving memory expansion, logic keyboards, robotic operation systems, and digital signal processing. It is also a popular choice for small-scale projects, such as those involving small microcontrollers, Arduino boards, and Raspberry Pis.

In conclusion, the SN74HC165D is a logic - shift register that is used in a variety of electronic applications. Its parallel-input/serial-output design makes it useful for applications requiring simultaneous input of eight signals and serialized output of these signals, one at a time. Its two modes, parallel load mode and serial load mode, give it added versatility. Last but not least, understanding two’s complement form is essential when working with the device’s output.