Paul said:
Hi i am presently trying to build a counter that counts freq upto 65536 Khz
in less than 1 msec is this possible also has any one any ideas to where i
should start thanks in advance for your help.
Obviously enugh, a counter driven at 65536kHz - I presume you mean
65.536MHz - will accumulate 65536 counts in one millisecond.
You will need a stable local oscillator to define your millisecond -
traditionally divided down from a 10MHz crystal oscillator, but more
precise solutions are available.
A 16-bit wide synchronous counter capable of running at 66MHz isn't
entirely trivial. Just stringing together regular TTL or CMOS parts
won't work, because the freely available 74F and 74ACT and similar
synchronous counters aren't quite fast enough. Making the first stage
of your counter out of a separately packaged JK-flip-flop might be
enough to get you over the hump, but most of the recent programmalbe
logic parts are fast enough and big enough t let you realise a suitable
16-bit synchronous counter in a single package.
I would help if you told us more about what you are trying to do.