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?

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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MrRoyal MrRoyal · Answer 2 · 2021-11-17T17:23:40+01:00

A flip-flop is a device that stores a single binary digit of data.

The small triangle means that the clock signal is an edge-triggered signal, while the circles mean that the signal of the flip-flop is low-active

The shapes used in flip-flops are:

Triangles
Circles
Bubbles

Triangles are used to indicate the trigger of the flip-flop, while circles are used to represent the signal

From the question, we understand that:

The flip-flop has a small triangle
And it has a circle

The small triangle represents an edge-triggered clock signal, while the circles represent that the signal of the flip-flop is low-active