Flip Flop & RS Latch

An Introduction

1. Flip Flop Introduction and RS Latch Special Slides for BSIT 3rd Morning And Evening Made by:Israr Ahmed BSIT 5 th Evening University of Education Lahore Okara campus ( Renala Khurd ) Ask Your Queries at.. [email protected]

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 m eans r eset 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)

10. 3 rd Semester Should Say Thanks to Resp. Sir Inam ul Haq