Was it Martin McCormick who wrote on Monday 30 September 2002 13:38:
> I am attempting to connect a pair of CD4048 8-input
> expandable gates together to form a 16-input nand gate. I did
> not do a very thorough job of writing down some of the notes
> which, as I recall weren't all that good to begin with so I have
> a question or two.
>
> Pin 15 is labeled as Expand. Is this an input or an
> output? What do you do with it on a CD4048 that is being used as
> an 8-input device by itself?
>
> When cascading multiple gates, do you connect the J
> output pin to the Expand pin of the following gate?
>
> The rest, I think I can figure out. Hu rah for wire-wrap!
>
http://www.chipdir.org/giicm/4048.txt
It's an 'or' or a 'nor' gate.
Use OR & invert your main output. Connect 8-16 into any input for a 15 input
gate. To make 16, you'd need an extra 'or' gate. That's how it seems to me.
--
Regards,
Declan Moriarty
Applied Researches - Ireland's Foremost Electronic Hardware Genius
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Author: Declan Moriarty
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