voltage divider calcs
in [Design]
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From: krw on 26 Apr 2010 18:18 On Mon, 26 Apr 2010 10:40:43 +0100, "Nial Stewart" <nial*REMOVE_THIS*@nialstewartdevelopments.co.uk> wrote: >>>I dunno about 'crappy I/O', >> I do. That's the point. > > >Details? 5V/3.3V only. I needed more like 1.2V, though could get away with 1.5V (Virtex I/Os worked at 1.2V anyway). Altera's were slow, too (if you couldn't infer that by the 5V capability). >I haven't had, or heard of any problems with Altera devices (at least wrt >adhering to the the data sheets). They were broken as designed.
From: krw on 26 Apr 2010 18:19 On Mon, 26 Apr 2010 17:18:20 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Mon, 26 Apr 2010 10:40:43 +0100, "Nial Stewart" ><nial*REMOVE_THIS*@nialstewartdevelopments.co.uk> wrote: > >>>>I dunno about 'crappy I/O', >>> I do. That's the point. >> >> >>Details? > >5V/3.3V only. I needed more like 1.2V, though could get away with 1.5V >(Virtex I/Os worked at 1.2V anyway). Altera's were slow, too (if you couldn't ^^^^^^ Virtex/E (sorry) >infer that by the 5V capability). > >>I haven't had, or heard of any problems with Altera devices (at least wrt >>adhering to the the data sheets). > >They were broken as designed.
From: Nial Stewart on 27 Apr 2010 04:42 > 5V/3.3V only. I presume this was a while ago? > I needed more like 1.2V, though could get away with 1.5V > (Virtex I/Os worked at 1.2V anyway). Altera's were slow, too (if you couldn't > infer that by the 5V capability). "Crappy" is an odd way to describe "didn't have the input range I was looking for". At the time perhaps there were more people looking for 5V input capability? Nial
From: krw on 27 Apr 2010 19:04 On Tue, 27 Apr 2010 09:42:31 +0100, "Nial Stewart" <nial*REMOVE_THIS*@nialstewartdevelopments.co.uk> wrote: >> 5V/3.3V only. > >I presume this was a while ago? > >> I needed more like 1.2V, though could get away with 1.5V >> (Virtex I/Os worked at 1.2V anyway). Altera's were slow, too (if you couldn't >> infer that by the 5V capability). > > >"Crappy" is an odd way to describe "didn't have the input range I was looking for". Crappy, as in three years out of date. >At the time perhaps there were more people looking for 5V input capability? Are you related to DimBulb? Altera was way behind the curve in I/O capability. Xilinx was too, but bought the IP (company) for the Virtex line. Altera sat there looking stupid.
From: Nial Stewart on 28 Apr 2010 05:52
> Crappy, as in three years out of date. Three years out of data for leading edge performance perhaps, but what % of users wanted that over 5V compatability (in 1998)? You said "Altera crappy I/Os weren't fixable", but they were as spec'd in the data sheet. I.e. not 'broken'. Nial. |