[oopic] Re: Angle of attack VII - any help appreciated

--- In oopic@yahoogroups.com, "Nick Mulder" <nick.mulder@...> wrote:
>
> Hi,
>
> turns out i was mistaken with the locally available chip I linked and
> it didn't have synchronous LOAD after all, but another dig around the
> shops here in New Zealand I found this:
>
> 74LS169 ...
> http://pdfdata.datasheetsite.com/web/59361/74LS168.pdf
>

Looks right! CEP' and CET' need to be '0', decode Q3 NAND Q2 and
connect to PE', U/D' needs to be '1'.

Use the PE' signal (output of NAND) to clock a 74LS74 with the D input
connected to its' own Q' output. This will toggle the flop every time
the PE' signal goes high which is when the count is set to either 0 or 1.

Apply '0' to P1, P2, P3 and apply the Q output of the flop to P0.

It should work!

Don't worry about having a bunch of 'not currently required' chips.
They will come in handy some day.

Richard

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