Synchronous and Asynchronous Counters in Digital Electronics
Counters:
Two types
of
counters:
Synchronous (parallel) counters
Asynchronous (ripple)
counters
Ripple counters
allow
some
flip-flop
outputs to be used
as a source of
clock
for
other flip-flops.
Synchronous counters apply
the
same clock to all
flip-flops.
Example 1:
Design
a
J-K
counter that goes through states
2, 4, 5, 7, 2, 4……
is
the
counter-self
starting.
Ans.
"State Excitation
Table"
25
K
-
m
aps
:
Circuit
Diagram:
26
Example 2:
Design
an
up-down counter using
JK
Flip-flop
to
count
0, 2, 3, 6,
4,
0….
Ans.
Up-down counter counts
as
(0,
2, 3, 6, 4,
0,......).
"State Ecitation
Table"
K
-
m
aps
:
27
Circuit
diagram
:
Explore the concepts of synchronous (parallel) and asynchronous (ripple) counters in digital electronics, where ripple counters enable clock sharing among flip-flops and synchronous counters apply the same clock to all. Learn to design J-K and up-down counters using flip-flops with examples and state excitation tables. Discover K-maps and circuit diagrams for better visualization of the circuits. Dive into the world of counters with practical applications and functionalities.
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Presentation Transcript
Counters: Two types of counters: Synchronous (parallel) counters Asynchronous (ripple) counters Ripple counters allow some flip-flop outputs to be used as a source of clock for other flip-flops. Synchronous counters apply the same clock to all flip-flops. Example 1: Design a J-K counter that goes through states 2, 4, 5, 7, 2, 4 is the counter-selfstarting. Ans. "State ExcitationTable" 25
K-maps: Circuit Diagram: 26
Example 2: Design an up-down counter using JK Flip-flop to count 0, 2, 3, 6, 4, 0 . Ans. Up-down counter counts as (0, 2, 3, 6, 4, 0,......). "State EcitationTable" K-maps: 27
