74HC595PW,118 Integrated Circuits (ICs)

Logic - Shift Registers

Shift registers are a type of digital circuit used for data storage and manipulation. They are often used for serial-to-parallel conversions and can be used to construct counters and other sequential logic circuits. Shift registers have multiple stages, each of which is capable of storing one bit of data. In this article, we will discuss the application field and working principle of 74HC595PW, 118.

Application Field

The 74HC595PW , 118 is a 8-bit serial-in/serial or parallel-out shift register with output latches. It features an asynchronous reset and can be used to increase the number of bits handled by a single device. Output latches allow for cascading multiple devices without needing additional logic to control the outputs. Additionally, the device can be used to drive a 7-segment display at high frequency or with low power. The 74HC595PW , 118 is available in 14-pin SOIC, 8-pin SOIC, and 8-pin PDIP packages.

Working Principle

The 74HC595PW, 118 is essentially composed of eight D-type flip-flops connected in serial. Each flip-flop has a data input (D) and a clock input (C). When rising edge an input clock signal is applied to C, data present at D is then loaded into the flip-flop. As the load moves from one flip-flop to the next, the application of the clock signal at each flip-flop causes it to load data present at its D input. This process is analogous to sequentially loading data into an 8-byte shift register, where data is loaded one byte at a time.

The stored data can be parallel-out using the 8 outputs, or it can be serial-out using the QH output. Additionally, each flip-flop also includes a reset (R) pin to reset the flip-flop to a known state. When reset is applied, a logic high or low is loaded into the flip-flop based on the current level of the R pin.

Conclusion

The 74HC595PW, 118 is an 8-bit serial-in/parallel-out shift register with output latches that is commonly used to increase the number of bits handled by a single device. It can be used to drive a 7-segment display at high frequencies or with low power. Its relatively low power consumption and cascading capabilities make it a popular choice for low-power and low-cost applications.