Lecture 12 - Webstaff.kmutt.ac.th - kmutt
Lecture 12 - Webstaff.kmutt.ac.th - kmutt
Lecture 12 - Webstaff.kmutt.ac.th - kmutt
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Summary<br />
The 74LS93A Asynchronous Counter<br />
The 74LS93A has one independent toggle J-K flip-flop<br />
driven by CLK A and <strong>th</strong>ree toggle J-K flip-flops <strong>th</strong>at form<br />
an asynchronous counter driven by CLK B.<br />
The counter can be extended to form a 4-bit counter by connecting<br />
Q 0 to <strong>th</strong>e CLK B input. Two inputs are provided <strong>th</strong>at clear <strong>th</strong>e count.<br />
CLK B<br />
(1)<br />
All J and K inputs<br />
are connected<br />
internally HIGH<br />
CLK A<br />
RO (1)<br />
RO (2)<br />
(14)<br />
(2)<br />
(3)<br />
J<br />
0<br />
K 0<br />
Q 0<br />
J 1 J 2<br />
C C C<br />
C<br />
K 1 K 2<br />
K 3<br />
(<strong>12</strong>) (9)<br />
(8) (11)<br />
Q 1 Q 2<br />
Q 3<br />
J 3<br />
Floyd, Digital Fundamentals, 10 <strong>th</strong> ed<br />
© 2009 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved
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