[sdiy] simple TTL programmable counter question (74LS163)

[Ken Stone]

>> You can see what I was doing in a similar project here. Admittedly I haven't
>> tested this PCB, but my prototype certainly ran fine. I think I also did one
>> using the 161, but I forget!
>>  
>> http://www.cgs.synth.net/modules/cgs20_dco.html
>
>No, you where using 193 and not either of 161 or 163s.

ALSO did one with 161 or 163. The count direction is reversed (i.e. an up
count, so it was pain, and I went back to the 193.

>> Not with LS TTL! they flake at about 25 MHz.
>
>I agree, for those speeds I would use a small CPLD or FPGA today. Cheap and
>fairly easy to get the intended performance.

The HC, ACT, and HCT series can get better frequencies, but I don't recall
how much better. 

Cheers,

Ken
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
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