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14 June, 19:23

On the 74ls74 d flip-flop, the clk input has a small triangle. the pr (preset) and clr (clear) inputs have a circle. what do these symbols mean?

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  1. 14 June, 21:35
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    The triangle indicates that the clock signal is an edge-triggered signal.

    The circle indicates that the signal is low-active (ie., inverted).

    The 74LS74 has a positive-edge trigger clock (low to high).
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