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Digital Electronics
NUMBER SYSTEM
BINARY CODES
BOOLEAN ALGEBRA
K MAPS
COMBINATIONAL CKT
SEQUENTIAL CIRCUITS
INTRODUCTION
CLOCK
BISTABLE MULTIVIBRATOR
DERIVATION of FLIPFLOP circuit
RS FLIPFLOP
RS FLIPFLOP(NAND IMPLEMENTATION)
R'S' FLIPFLOP
Clocking RS LATCH
Other LATCHes
Timing problem in LATCHES
MORE QUESTIONS
TIMING CIRCUITS

 

QUESTION

Q- Design the ripple counter whose output sequence is represented by the following state diagram.

Ans: As we can see that it is a down counter so we’ll be using Q bar of all flip-flops as clock to next flip-flops (negative edged FFs). We draw the table as

 Q2         Q1          Q0                          OUTPUT

0              0              0                              0

0              0              1                              0

0              1              0                              1

0              1              1                              1

1              0              0                              1

1              0              1                              1

1              1              0                              1

1              1              1                              1

 

And using K-map we get the combinational circuit as:

 

And the equation we get is

Z= Q2 + Q1

 

 

 

And the whole circuit is as:

 

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