Digital Electronics - Flip-Flops - Discussion
Discussion Forum : Flip-Flops - Filling the Blanks (Q.No. 27)
27.
The inputs on a 7474 D flip-flop are S, R, D, and CLK ________ is/are synchronous.
Discussion:
2 comments Page 1 of 1.
Wraadf said:
8 years ago
Why would there be SR in a D flipflop D FF only has one D input?
Gia said:
2 weeks ago
S (Preset/Set): Asynchronous. Overrides everything immediately.
If you activate S (LOW), Q goes to 1 instantly, ignoring the clock and D.
R (Clear/Reset): Asynchronous. Overrides everything immediately.
If you activate R (LOW), Q goes to 0 instantly, ignoring the clock and D.
If you activate S (LOW), Q goes to 1 instantly, ignoring the clock and D.
R (Clear/Reset): Asynchronous. Overrides everything immediately.
If you activate R (LOW), Q goes to 0 instantly, ignoring the clock and D.
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