Re: The ultimate clock-problem (74LS42)

From: Rikard Bosnjakovic (bos_at_REMOVETHIShack.org)
Date: 03/27/05 

Date: Sun, 27 Mar 2005 14:01:47 GMT

After 6 straight hours of finding the problem, I think I've found a
possible problem of why my circuit won't work. The 74LS192 is not a
74LS192. It's a 74C192, which I take is a CMOS-circuit. I recall someone
saying that you can't control a CMOS-circuit with a TTL-circuit (or was
it the other way around?), but I'm not 100% sure of that fact.

So, to conclude the problem: 74C192 controls the 74LS42, which sends a
signal to the inverter-NOR 74LS02, which sends a reset-signal back to
the 74C192. So I guess it looks something like this:

    CMOS -> TTL -> TTL
      ^ |
       \----------------/

I do not have any other (TTL) 192-ICs and no other (CMOS) 42-ICs, but I
have one CMOS-NOR if that is of any help. 

-- 
Rikard Bosnjakovic                         http://bos.hack.org/cv/
Anyone sending unwanted advertising e-mail to my address will be
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