On 27/01/2011 12:36, Wouter van Ooijen wrote:
> On 27/1/2011 12:07 PM, Geo wrote:
>> Wouter van Ooijen wrote:
>>
>>> Now it would be nice if there were a similar chip with 4 in each
>>> direction, fixed direction would be OK.
>> Would the 74LVC241 work?
> nice chip! solves the 5 ->  3v3 part.
>
> why didn't I even see it when searching? probably because it isn't
> called a level shifter :(
>
Old 74LS chips in theory (many of them) have logic 1 and 0 output levels=20
that are more compatible with 3.3V logic than 5V cmos logic.
I think the CMOS HCT series is TTL in compatible and 5V out so would do=20
reverse?

LS TTL levels are not 5V for logic "1" more like 2.7V?

I'd need to re-read the old data sheets :-)
--=20
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