74LVC4245A alternative with individual direction?

[Philipp Klaus Krause]

I'm looking for a level shifter that works basically like the
74LVC4245A, but instead of having one common direction control line has
individual direction control lines?
Does anyone know about such a chip?

Philipp

 

[[email protected]]

I'm looking for a level shifter that works basically like the
74LVC4245A, but instead of having one common direction control line has
individual direction control lines?
Does anyone know about such a chip?

You might have a problem finding such a beast. With two direction controls
there is a possibility of latching if both outputs are enabled simultaneously.
Manufacturers don't like to allow mere users to shoot themselves in the foot,
like this so only one set of outputs can be active at a time. Having only DIR
and OE\ pins, rather than two /OE pins is one way to keep field problems to a
minimum.

 

[Philipp Klaus Krause]

Am 30.06.2010 01:27, schrieb [email protected]:

You might have a problem finding such a beast. With two direction controls
there is a possibility of latching if both outputs are enabled simultaneously.
Manufacturers don't like to allow mere users to shoot themselves in the foot,
like this so only one set of outputs can be active at a time. Having only DIR
and OE\ pins, rather than two /OE pins is one way to keep field problems to a
minimum.

Sorry, for not chosing a clearer wording of my question. I'm looking for
a level converter that has one direction / OE line per data input
/output (instead of common lines for all 8 as in the 74LVC4245A).

Philipp

 

[Philipp Klaus Krause]

Am 29.06.2010 21:50, schrieb whit3rd:

How about a whole bunch of 74LVC2T45 and 74LVC1T45?

That would certainly do. I was just wondering if there's something like
a chip that contains multiple 74LVC1T45.

Philipp

 

[Uwe Hercksen]

Sorry, for not chosing a clearer wording of my question. I'm looking for
a level converter that has one direction / OE line per data input
/output (instead of common lines for all 8 as in the 74LVC4245A).

Hello,

you want to have for each of the 8 data bits one direction input, one OE
input and the two A and B IOs? Such a chip would need at least 35 pins,
very strange for a 8 bit bus tranceiver and level converter.

Bye

 

[Philipp Klaus Krause]

Am 30.06.2010 12:35, schrieb Uwe Hercksen:

Hello,

you want to have for each of the 8 data bits one direction input, one OE
input and the two A and B IOs? Such a chip would need at least 35 pins,
very strange for a 8 bit bus tranceiver and level converter.

Ture, but maybe there's a 4-bit one.

Philipp