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The key difference between a D latch and an SR latch is in how they are triggered to change their output.

In an SR latch, the output changes based on the state of the S (set) and R (reset) inputs. When both inputs are low, the latch holds its current state. When S is high and R is low, the output is set to high. When R is high and S is low, the output is set to low. However, when both S and R are high, it can lead to unpredictable behavior.

On the other hand, a D latch changes its output based on the state of the D (data) input. When the clock signal transitions from low to high, the D latch captures the input data and updates its output accordingly.

These variances impact their functionality in digital circuits as the D latch is more commonly used for data storage and synchronization, while the SR latch is more prone to issues like race conditions and unpredictable behavior due to its set and reset inputs.

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