Prerequisite – Flip-flop

**1. S-R Flip-Flop :**

S-R flip-flop is similar to S-R latch expect clock signal and two AND gates. The circuit responds to the positive edge of clock pulse to the inputs S and R.

**2. D Flip-Flop :**

D Flip-Flop is a modified SR flip-flop which has an additional inverter. It prevents the inputs from becoming the same value.

**Conversion of S-R Flip-Flop into D Flip-Flop :**

**Step-1:**

We construct the characteristic table of D flip-flop and excitation table of S-R flip-flop.

**Step-2:**

Using the K-map we find the boolean expression of S and R in terms of D.S = D R = D'

**Step-3:**

We construct the circuit diagram of the conversion of S-R flip-flop into D flip-flop.

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