74LVC4245A alternative with individual direction?
in [Design]
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From: Philipp Klaus Krause on 29 Jun 2010 10:40 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
From: whit3rd on 29 Jun 2010 15:50 On Jun 29, 7:40 am, Philipp Klaus Krause <p...(a)spth.de> wrote: > 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? How about a whole bunch of 74LVC2T45 and 74LVC1T45?
From: krw on 29 Jun 2010 19:27 On Tue, 29 Jun 2010 16:40:47 +0200, Philipp Klaus Krause <pkk(a)spth.de> wrote: >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.
From: Philipp Klaus Krause on 30 Jun 2010 04:21 Am 30.06.2010 01:27, schrieb krw(a)att.bizzzzzzzzzzzz: > On Tue, 29 Jun 2010 16:40:47 +0200, Philipp Klaus Krause <pkk(a)spth.de> wrote: > >> 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. 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
From: Philipp Klaus Krause on 30 Jun 2010 04:23
Am 29.06.2010 21:50, schrieb whit3rd: > On Jun 29, 7:40 am, Philipp Klaus Krause <p...(a)spth.de> wrote: >> 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? > > 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 |