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.

What's not to like about the 74LCX245?

                                        ...Jim Thompson
-- 
| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     et      |
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