We have a problem in master-slave flip-flops. Consider a RS Master-Slave Flip-flop and following waveforms are the expected output of RS flip-flop While when we actually give the above inputs to RS master-slave flip-flop, we get the following outputs And we see that at the 4th and 5th edge we have the wrong transitions. Why so? Before […]
Tag: flip flop
Master slave Flip flop
We use 2 separate latches to construct a master-slave flip-flop. One latch acts as a Master and other acts as a Slave. Both are level triggered latches but one is latched on positive level and other on negative level. Diagram of the RS master-slave flip-flop is as: First latch acts as a master and 2nd latch acts as […]
Edge Sensitive Latch (i.e. FLIP-FLOP)
Latches which are activated by the edge of the clock are called Flip-flops. If it is a positive edged flip-flop then inputs are accepted only when a LOW to HIGH transition occurs in the clock and if it is a negative edged flip-flop then inputs are accepted only when there is a HIGH to LOW transition in the clock […]
QUESTIONS: Flip flops/Latch
Q-What is the difference between LATCH & FLIP-Flop? Ans: We can easily find the answer after going through the theory given: Latches are level sensitive while flip-flops are edge sensitive devices Hence latches faces problems like glitches in the output while no such problem occurs in flip-flops. As we can see from different circuits given […]
JK Latch
This is very similar to RS latch but the ambiguous state has been eliminated and output is fed back to the AND gates. Also in this latch we get a complimented output when both the inputs are 1. Inputs are designated as J and K. The circuit diagram is as follow: Let’s now try to […]
D Latch
As we have already discussed that when ever we have both R & S equal to 1 we witness an ambiguous state. Hence to avoid this we have made an arrangement in which we’ll never have both R & S equal. We connect the two inputs with an inverter between them as shown below: This […]
Clocking RS latch
We can control RS Latch with clock by ANDing both inputs with clock separately as: Hence when we have CLK (OR E) = 1, R & S gets passed to the RS latch circuit and hence the output is affected by the inputs only when CLK (OR E) = 1 and when CLK (OR E)=0, […]
Deriving the circuit of Flip flop
DERIVING THE CIRCUIT OF FLIPFLOP (from digital components): To understand the logic let’s consider a basic circuit of an inverter with a feedback as below: Now what would be the output of the circuit? We know what ever is at input, we’ll get inverse of that at output and as output is fed back to input […]
Bistable Multivibrator/Flip flop
FLIP-FLOP is another name of Bi-stable Multi-vibrator. A flip-flop is the basic element of sequential circuit. It has the capability of storing 1 bit. The circuit of the Bi-stable Multi- vibrator using transistors is as follow: The two transistors are used to store a single bit and they can hold data without external assistance as far as power is […]