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Subject: Re: Mixed Voltage TTL design
Date: Tue, 03 Sep 2002 21:00:45 +0200
Organization: Wanadoo, l'internet avec France Telecom
NNTP-Posting-Date: 3 Sep 2002 19:00:49 GMT
X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.19-rc3 i686)
Eric Simmerman wrote:
> I'm designing a TTL circuit to interface with a I/O circuit that runs
> at 12 volts. I've got experience with logic design, but this is out of
> my area of expertise. I was thinking of slapping a voltage regulator
> circuit in to use the 12volt VCC to provide power to my 5-volt TTL
> components, but I don't know the best way to boost my 5-volt outputs
> back up to 12 volts (I have 6 outputs). I also don't know if this is
> the best general approach. Can anyone point me in the right direction?
> This has to be a fairly common problem right?
If you just need to shift the logic levels back from TTL to "CMOS", take
a look at CD40109. But maybe it's not the best approach - all depends on
the load that you need to drive from your TTL. Then maybe your whole
circuit can be implemented on a logic family that works from 12V. Tell us
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