On 3/10/06, Michael Rigby-Jones wrote: > > > >-----Original Message----- > >From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] > >Sent: 10 March 2006 15:12 > >To: Microcontroller discussion list - Public. > >Subject: Re: [PIC] ENC28J60 Power Consumption > > > > > >On 3/10/06, Olin Lathrop wrote: > >> Vasile Surducan wrote: > >> > Maybe the problem is that a small chip like this can eat 825mW. > >> > >> It's not that small. These things only come in the 28 pin SOIC > >> package as far as I know. It should be able to dissipate 825mW > >> without even getting so hot as to burn your finger. > > > >Olin, these days there are DSP cores running at 2400MHz (4 x > >600MHz parallel core) without any radiators with package > >temperature below 50C. Do you think a damn ethernet chip which > >is near 1W "is not that small" ? All ethernet chips on the > >market are sourcing maxim 150mA (some very old below 50mA), so > >250mA in Microchip datasheet is ok for you ? Why they stopped > >production a while ago on this chip? > > Olin stated that the package is not particularly small and should be capable of dissipating that power, he didn't say that the power dissipation was small! > > I think you are comparing apples and oranges anyway, devices that need to drive long cables at high speed do tend to have high power requirements. Mike, Why are you so sure about my comparations ? Maybe if you compare aples with aples, so Ethernet chip from Microchip with other older ethernet chips on the market (having the same internal arhitecture, but with parallel and/or I2C IO ) you'll se the ENC is one of the power hungriest one (I didn't compare it only with three others) About driving cables, I know devices with 5000V/uS slew rate which are driving cables t 400Mhz and are sourcing half from this power, so maybe this is irrelevant. best regards, Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist