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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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18.2 FLIP-FLOPS

The bistable multivibrator is generally termed as a flip-flop. Flip-Flop is a one-bit memory element. A flip-flop can be triggered symmetrically (synchronously) or unsymmetrically (asynchronously). Various variations in flip-flops are considered here.

18.2.1 The Basic RS-latch

An RS-latch is the simplest possible memory element. It is constructed by feeding the outputs of NOR gates back to the input of the other NOR gates. These cross connections act as feedback, as shown in Fig. 18.3.

The inputs R and S are referred to as the Reset and Set inputs, respectively. To understand the operation of the RS-latch, consider the following cases: For the NOR gate when any one of the inputs is 1 the output is 0. The outputs Q and are complement ...

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