[sdiy] 8 bit up/down counter?

[David Moylan]

The problem with CPLD is I'd need to tool up and learn the programming. 
  I'm looking for small quantity, just something I can find easily.

The 74LS469 seems good.  Though, I'd prefer the 779 since I don't need 
the extra pins, but I can't seem to find them at Mouser nor Digikey.

On 7/17/11 2:12 PM, Matthew Smith wrote:
> Quoth David Moylan at 18/07/11 05:33...
>> Anyone know of a current production 8 bit (or more) up/down counter
>> preferably in DIP? I need to stack a few of them so would prefer not
>> to have to use 4-bit units.
>
> How many stages do you want to end up with?
>
> If it were me, I'd be looking at programmable logic. One CPLD could give
> you lots of stages. If you don't specifically want DIP and just want
> non-SMD, a PLCC package in a through-hole socket could do the job for you.
>
> I'm assuming (possibly incorrectly) that, when you ask for current
> production, you're looking to make a number of these and want reliable
> supply.
>
> Only slight caveat with CPLDs is that there is a move away from 5V parts
> (at least with the Xilinx ones I use) to 3.3V. Whilst some of these have
> 5V-tolerant IO, they would need a supply regulator if the rest of your
> logic is 5V. I've noted that the 5V XC95xx parts are starting to go UP
> in price whilst, at the other end of things, I picked up 5 x XC95144XL
> (144 pin QFP, 3.3V) for $18 USD delivered on eBay yesterday.
>
> If you need more stages (say, 64,) than will fit in a regular PLCC
> device, there is always QFP. They really aren't that hard to
> drag-solder. (Could even have a SIP-mounted QFP on its own tiny little
> board with regulator to plug into a row of 0.1" pitch holes/socket.)
>
> I'd be more than happy to write the couple of dozen lines of Verilog
> required to implement something like this on a CPLD :-)
>
> Cheers
>
> M
>