Re: 3.3V-5V level ****fters

On Wed, 24 Sep 2008 17:26:32 -0700, Joerg
<notthisjoergsch@[EMAIL PROTECTED]
> wrote:

>What's the jelly-bean level ****fter du jour, the most popular?
>
>Need to ****ft three sigs 3.3V to 5V and another three 5V to 3.3V. Stuff 
>us analog dudes normally don't do. The TXB0104 looks ok, so does the 
>74LVC4245. But the specs for both are horrible, incomplete at best. Not 
>much in drive levels mentioned, or just for one direction.
>
>The topper is a comment in the TXB spec, "OE should be tied to GND 
>through a pulldown resistor; the minimum value of the resistor is 
>determined by the current-sourcing capability of the driver" That driver 
>is obviously on the chip. Duh! Of course they also forgot what to do if 
>not needed. Pull up? Leave open? Who knows. Well, maybe they had a 
>kegger the night before ...
>
>Here's what seems to qualify as a datasheet these days:
>http://focus.ti.com/lit/ds/symlink/txb0104.pdf
>
>VOH and VOL at 20uA. Microamperes! Couldn't believe it.

Going from 5v to 3.3v is easy with Fairchild 74LCX541 and other parts
in the family. I've found that Fairchild seems to have more
interesting parts in jellybean digital, power FETs, and analog
switches.

Mark