23 Dec
2008
23 Dec
'08
5:30 p.m.
Roy J. Tellason wrote:
On Monday 22 December 2008 04:07:10 am Mike Hatch
wrote:
As will tying the D input back to not-Q, which most of them have. The
advantage to using the D-type over the J-K is two fewer package pins needed,
which may or may not be important to somebody.
And what the heck does that J-K stand for, anyway?
J(am) and K(lear) ?
BTW Lets not forget the early computers used pulses not logic levels.
That was fun timing !
A simple
example of the differnce. If you take a D-type flip-flop and
connect the output to a NOT gate and the output of that back to the D
input, then you get a divide-by-2-circuit. Feed in a regular clock at one
frequency and the Q output will toggle at half that frequency. But if you
A
clocked JK with the JK held high will perform the same function.