[Diy_efi] Continuing the chip switcher "problem"

[mbelloli at speedymotorsports.com]

I'm glad I asked.  I didn't drive the unused inputs of my 374 to anything.
 I'll add that this morning.  I'm understanding.  All digital stuff is
like the Pic. Doesn't want any wondering circuits.  If not used pull to a
fixed state.  The worst part is my friend took the car to the races for
the weekend, so I won't be trying it on a real car until next week! 
Ahhhhh.  So close.

Marcello

> Hi Marcello,
>
> Way to go!  To answer your questions:
>
> 1.    Correct.  No pullups needed from output of  373 to the memory.
>
> 2.    No series resistors needed between PIC outputs  and 373 inputs.  BUT
> I
> would use pullups on the PIC outputs, because  otherwise they will be in
> an
> indeterminate state until your PIC software asserts  itself and configures
> the
> port concerned.
>
> 3.    Don't forget to tie the INPUTS of all UNUSED  devices in the 374
> either
> high or low - it doesn't matter which.  You can  leave the outputs
> unconnected.  You can connect pins like "Output enable"  on the 374
> directly to Vss or
> Vcc without difficulty.
>
> We are all waiting with bated breath to see if you are successful - but I
> know where my money is!
>
> Will Cowell
> G0OPL
>
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