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Type D Flip Flops

A D flip flop is like a transistor. The D flip flop has a data input,output, and a clockline. The when the flip flops clock line is brough from low to high it takes a snap shot of the input. Then it outputs that "snap shot" until a new picture is taken. Some D flip flops have two outputs, the same as the input and the inverse. A D flip flop can be though of as basic memory.

For example, if the data line is high but the clock stays low the output,shown as Q, will stay what it was until the clock line is set.
Inputs Outputs
CLK DQ
L to H HH
L to H LL
H or L XQ0*
*Does not change