74HC574D,652

Series:	74HC
Packaging:	Tube
Part Status:	Active
Function:	Standard
Type:	D-Type
Output Type:	Tri-State, Non-Inverted
Number of Elements:	1
Number of Bits per Element:	8
Clock Frequency:	133MHz
Max Propagation Delay @ V, Max CL:	26ns @ 6V, 50pF
Trigger Type:	Positive Edge
Current - Output High, Low:	7.8mA, 7.8mA
Voltage - Supply:	2 V ~ 6 V
Current - Quiescent (Iq):	8µA
Input Capacitance:	3.5pF
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Base Part Number:	74HC574

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Logic - Flip Flops

Flip Flops are logical devices used to control the flow of data within a system. In particular, Flip Flops work by receiving a pattern of electrical signals (inputs) and then outputting a similar pattern of signals (outputs) in response. An important type of Flip Flop are known as the 74HC574D and 652. In this article, we will explore what these Flip Flops are, their application field and the working principle behind them.The 74HC574D and 652 are register-based Flip Flops, otherwise known as ‘shift registers’. These types of Flip Flop use a clocking signal to toggle between two different output states. They can be used to control the flow of data by storing a set of binary values which can then be accessed sequentially by the clock signal. This makes them a useful tool in circuit design, especially where data needs to be sequentially read out.The 74HC574D is a type of 8-bit shift register, while the 652 is a 16-bit shift register. Both of these Flip Flops have their own specific application fields. For example, the 74HC574D is especially useful for buffering and combining data from multiple sources. It can also be used for constructing logic functions, or for sequencing the order of operations within a circuit.The 652 on the other hand, is more suited towards controlling large amounts of data. It is commonly used for low-speed serial-input applications, like LCD display controllers or timing units. Its 16-bit nature makes it capable of transmitting and receiving data at a much higher speed than the 74HC574D.No matter which type of Flip Flop you are using however, the basic operating principles remain the same. A Flip Flop works by receiving an input signal (often provided by an oscillator), and then outputting a similar signal one ‘clock’ later. This can be interpreted as a shift, or ‘flip’, in the state of the Flip Flop.The data stored within the register is then shifted to the next register element, and so on and so forth, until all data has been transferred. This is where the name ‘shift register’ comes from, as each ‘shift’ of the Flip Flop successfully outputs or ‘shifts’ all data one place forward.In conclusion, the 74HC574D and 652 are both register-based Flip Flops, capable of shifting data within a system. These Flip Flops differ from each other in terms of their application field, as the 74HC574D is better suited for logical operations like buffering and combining data, while the 652 is more geared towards larger data transfers (e.g. LCD controllers).Despite their differences, all types of Flip Flops fundamentally operate by using a clock signal to shift the state of the register, thereby controlling the flow of data within a system.

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