HTL to TTL conversion

Lots of missing info:

HTL logic level... what levels? Seems a "non-standard" "standard"

Speed? If slow, just use a comparator.

...Jim Thompson

Hi Jim,

I'm not sure about the "levels" for HTL - I have searched but not turned up anything useful. The outputs are square waves 0 to 11.9V

There are 3 signals - A,B and Index and the maximum frequency will be

Mike

If you are certain about those output levels then you can use the 74HC4050.

Can't we do something more interesting here? For example, for a nice HTL logic threshold, near 6V, we could use a PNP transistor in a level-shifter stage with a 6V-threshold:

Yep, that'll do it. Looks like it's sized to have a relatively low input threshold to accommodate quite a range of input levels.

...Jim Thompson

Sure, use 18 components, when one will do ;-)

...Jim Thompson

So how many components are there in that single chip Fred recommended hmmm?

Tim

-- Deep Fryer: A very philosophical monk. Website @

Which would you rather assemble ?:-)

...Jim Thompson

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Le Sun, 26 Aug 2007 10:53:09 -0700, Jim Thompson a écrit:

The former. There's no assembly to speak about for *one* component.

I said it was more interesting, as opposed to _boring_ and if we're counting, that's three channels or 9 parts, not 18. And that's a 6V threshold, instead of 1.35V (worst-case) for the hc4050, improving signal noise immunity by over 4x.

Nine components with 21 solder connections, instead of sixteen. OK, that's 31% more.

Sure I'd use the '4050 (hey, it's an oldtime favorite of mine and tens of thousands were used in my designs years ago), but I'd first cast an admiring glance at alternate ideas.

Thanks to all who replied.

Regards, Mike