Flip Flops Edited

8/13/2019 Flip Flops Edited

1/7

Name:_________________________________________ Date:_____________________

Section:_______________________

Flip Flops

I. OBJECTIVE

To familiarize with the input/output characteristics of RS, D, T and JK flip-flop deices and theconersion amon! them"

II.BACKGROUND INFORMATION

# flip-flop, as stated earlier, is a $i-sta$le circuit" %oth of its output states are sta$le" The circuit remainsin a particular output state indefinitel& until somethin! is done to chan!e that output status" 'o!ic circuit whoseoutputs depend upon circuit inputs as well as preious alues of circuit outputs descri$ed as their present states are(nown as se)uential lo!ic circuits" # se)uential s&stem can $e defined in terms of its inputs and present state" Thatis, the ne*t state of the se)uential s&stem can $e determined from these two )uantities" The +cloc(ed RS, D, JK andT flip-flops are characterized $& the followin! state ta$les"

The . in the RS flip-flop state ta$le means that when R 0 1 and S 0 1 then the ne*t state is notdetermined e*plicitl&"

S Qt Qt+12 2 2

2 1 1


2/7

1 2 1

1 1 1

222

2 1 2

1 2 .

1 1 .

III. MATERIALS REQUIRED

Sl"No" 34564N7NT S6738983#T84N T;"

1" S" D8=8T#'

4S38''4S3467D?#' D

9'869'46

74LS74 TTL IC 1

@" Dual JK 9lip 9lop 74LS76 TTL IC 1

A" 6#T3< 34RDS - >2

IV. EXERIMENTAL ROCEDURE

1.3onstruct the cross-coupled N#ND !ate $asic RS flip-flop depicted in the fi!ure $elow and erif& its se)uentialoperation $& completin! the timin! dia!ram shown"

>" 3onstruct the

cloc(ed RS flip flop of fi!@" Determine itsstate ta$le" ?se mono-sta$le circuit as&our cloc( source"3omplete the timin!dia!ram $elow"


3/7

@" Simultaneousl& application of ones to R and S of the cloc(ed RS flip flop, o$sere the outputs"

4) Since the constructed cloc(ed RS flip flop is s&mmetric, we can chan!e the position of R B S, and and C" 8t isstill a cloc(ed RS flip flop"Repeat step @, see what has happened" =ie &our conclusion"

" ?sin! the EA'SEA dual D flip flop, inesti!ate the operation of the D flip-flop " 3ompare &our result with the stateta$le !ien a$oe" 6a& attention to the chan!e in state of the deice as the cloc( si!nal is risin! or fallin!"3ompare the followin! timin! dia!ram"


4/7

F" 'et input R open, !round the input S, watch the output and then let S open, !round R, watch the output"Determine the usa!e of R and S"

E"?sin! the EA'SEF dual JK flip flop, determine its lo!ical operation" The circuit dia!ram is shown in fi! F " 6a&attention to the chan!e in state of the deice as the cloc( si!nal is risin! or fallin!" 3ompare the followin! timin!

dia!ram"


5/7

G" The flip flop can simulate each other" 3onstruct the circuit shown $elow" Herif& its se)uential operation as a D flip flop"3omplete the followin! timin! dia!ram" 3ompare it with the timin! dia!ram of procedure E"

I"Wiring the circuit shown in figure below, verify that it is a T fli flo! Co"lete the ti"ing #iagra"!

V. Co!"l#sio!$


6/7

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%.

VI. Q#&stio! '!( A!s)&*$

1" hat is a cloc(ed J-K flip-flop. hat improement does it hae oer a cloc(ed R-S flip-flop.

______________________________________________________________________________________

__________________________________________________________________________________________________________________________________________________________________________"

>" hat is meant $& the race pro$lem in flip-flops.


7/7

" ith the help of a suita$le circuit, $riefl& e*plain how a D flip-flop can $e used to detect the se)uence ofoccurrence of ed!es of s&nchronous inputs"

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________"

Documents

Flip Flops Edited