Re: Repair of HP Logic Clips
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Those were made when I was at HP-Santa Clara. That is indeed a custom chip. My group made the photomasks.
Jeremy ?
There's no listed equivalent in the HP cross references, so it's almost
certainly a custom chip.? You could do that when you owned your own fab.
I'm not aware of any off the shelf part that can automatically connect
itself to the correct power rails.
If you skipped that part, it would be easy enough to duplicate using
smd parts.
On Sat, Nov 02, 2024 at 08:25:17PM +0000, Tom Gardner wrote:
> Based on the little information in that manual, it could be no more than a
> 74LSxx plus input pull up resistor, optionally with a schmitt trigger
> input. That's based on the absence of a spec for what happens when the
> input is below 2V
>
> But the input might also be a comparator, with the decision voltage being
> 2V.
>
--
Paul Amaranth, GCIH? ? ? ? ? ? ?| Manchester MI, USA? ? ? ? ? ? ?
Aurora Group of Michigan, LLC? ?|? ?Security, Systems & Software
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Jeremy Nichols