This document provides an introduction and overview of flip flops and RS latches. It defines a flip flop as a circuit that has two stable states and can store state information. It describes the main types of flip flops as asynchronous and synchronous, and lists some examples like the RS latch and JK flip flop. It then explains the key differences between asynchronous and synchronous circuits. The document proceeds to describe the RS latch in more detail, including providing its block diagram, logical diagram using NAND gates, truth table, and descriptions of its inputs, outputs, operation, and states.

1. Flip Flop Introduction and RS Latch
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2. Flip Flop
• In electronics, a flip-flop or latch is a circuit that has
two stable states and can be used to store state
information. (Wikipedia)

3. Types of Flip Flop
Flip Flop
(Known as Latch ) (Known as F/F)
Asynchronous Synchronous
RS Latch Clock RS F/F
JK Flip Flop

4. Difference Between Synchronous & Asynchronous
Asynchronous:
• Output change immediately when input changes.
• Its event driven.
.
Synchronous:
• Output change but according to clock pulse not Immediately in
many times.
• Its clock pulse driven.

5. RS Latch
• It’s a block diagram of RS Latch.

6. Logical Diagram for RS Latch
• Active Low Latch (Using Nand Gates)

7. Truth Table for RS Latch
• It’s a truth table for RS Latch using Nand Gates.

8. Description about RS Latch
• It has two Inputs S and R
• Input S means set & input R means reset
• It has two outputs Q and Q’
• No clock pulse are used in a latch
• It can store 1 bit of data (either 1 or 0)
• It has two states whether set or reset
• In set condition it store 1 bit
• And in reset condition it store 0 bit

9. Description about RS Latch (Cont..)
• Its asynchronous device
• Inputs change output immediately when input changes.
• When S=1 and R=0 0n input then it will reset (store 0 bit)
• When S=0 and R=1 on input then it will set (store 1 bit)

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