R-S Latch

-
R-S latch

R-S Latch

  • Latchs is a basic building element in sequential circuits. Latches do not have clock signal, that is, they are asynchronous sequential circuits
  • Latches are made up of static gates and are bi-stable i.e. it has two stable states and can switch between these states. Latches will have a feedback path from the output. Thus they change their output at any instant using the previous and present states of the signals

    • R-S latch bloack diagram

    Where S=SET Input R=RESET Input Q=Output Qbar=Complemented Output
  • RS latchimplemented using NOR gates and we can store either a 0 ar a 1 in this circuit depending upon the vlaue of R and S
    1. When R=0, S=0 we don't have a change in the output in the circuit. Hence Q and Qbar remains in the previous state
    2. When R=0, S= 1 we have ouput as Q=1 and Qbar=0. This as SET state.
    3. When R=1, S=0 we have the output Q = 0, Qbar= 1. This state is called as reset state.
    4. When R=1 and S=1, both R and S make outputs of their NOR gates 0. Hence we have Q=0, and Qbar= 0 which is not a valid case as Q&Qbar should be compliment of each other and hence we don't consider this case. This is called RACE CONDITION
  • All these cases can be collactively represented in the truth table above

Comments

Post a Comment

Popular posts from this blog

Miller Crystal Oscillator

-
Image
Miller Crystal Oscillator Miller Crystal Oscillator Similar to modifications in Colpitt's oscillator, the Hartley oscillator circuit can be modified, to get Miller crystal Oscillator In Hartley oscillator circuit, two inductors and one capacitor is required in the tank circuit. One inductor is replaced by the crystal which acts as an inductor for the frequencies slightly greater then the series resonant frequency. The tuned circuit of L1 and C is offtuned to behave as an inductor i.e. L1. The crystal behaves as other inductance L2 between base and ground. the Internal capacitance of the transistor acts as a capacitor required to fullfill the elements of the tank circuit The crystal decides the operating frequency of the oscillator.
Read more

Electronic oscillator division types and use

-
Image
Electronic oscillator division types and use Electronic oscillator division types and use Introduction to oscillator An oscillator is a amplifier and it is a close loop circuit or network. It uses the Positive feedback. It is not require the externel signel and generate the a desired frequency A oscillatpr acts like generator, It oscillates the constant amplitude and frequency. Oscillator can generate the frequency upto gigahertz. Classification of the Oscillators Oscillators are classified based on the type of waveforms generate from the oscillator, range, frequency, parameters used. Based on Output waveforms. Based on circuit components. Range of operating frequency. Based on feedback uses or not uses Types of oscillatprs LC Oscillator Har...
Read more

Distence Measurment using Arduion

-
Image
Distence measurment using arduino How to make distence measurment using arduino Distence measurment using the arduino is easy just need to fallowing componets and connect the shown in the connection diagram Arduino Ultrasonic sensore 1 10k Potentiometer Bread Board Connecting wire LCD display Breaboard First take the breadboard and conect the wires as shown in the diagram connections connect the red and black wire for +5Vcc amd ground in arduino connect the display vss to ground and vdd to ground connecth the display V0 to center of the potentiometer display RS pin to arduino pin 2 Disply RW pin to Arduino ground Display E pin to Arduino pin 3 Display pin D4 to Arduino pin 4 Display pin D5 to Arduino pin 5 Display pin D6 to Arduino pin 6 Display pin D7 to Arduino pin 7 Displa...
Read more