Post by thread:[EE]: Low current RS485 drivers

Hello, I always used 75176 RS485 drivers on my products, but they uses more than 20mA when outputs are disabled. This is way more than I like. What are you using when you need low power consumption? Best regards, Brusque ----------------------------------------------------------------- Edson Brusque C.I.Tronics Lighting Designers Ltda Researcher and Developer Blumenau - SC - Brazil Say NO to HTML mail http://www.citronics.com.br ----------------------------------------------------------------- -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

I found this parametric search very useful for finding 485 parts http://para.maxim-ic.com/ss.asp?Fam=RS485&Tree=Interface&HP=Interface.cfm example low power results MAX1484 Full-Duplex, 12Mbps, RS-485/RS-422 Transceiver, 1Tx + 1Rx, 300uA, 256 Nodes $1.25 MAX1486 Software-Selectable Half-/Full Duplex, 12Mbps, RS-485/RS-422 Transceiver, 1Tx + 1Rx, 300uA, 256 Nodes, $1.25 http://www.maxim-ic.com -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam@spam@mitvma.mit.edu

Hi Brusque, Not sure if this will help, but ST (http://www.st.com) make a part called the ST485 which supports 64 nodes @ 300-500uA with driver disabled and 400-900uA enabled - according to the datasheet.. I'm not doing low power stuff, so there might be a better solution out there. Cheers, Ash. --- Ashley Roll Digital Nemesis Pty Ltd http://www.digitalnemesis.com Mobile: +61 (0)417 705 718 > {Original Message removed}

At 11:01 PM 3/7/02 -0300, you wrote: >Hello, > > I always used 75176 RS485 drivers on my products, but they uses more >than 20mA when outputs are disabled. This is way more than I like. > > What are you using when you need low power consumption? LTC485 300uA/500uA typ/max with outputs disabled. LTC has many others, if you need really low Iq for battery power something else might be better. about $1.25 The LTC1334 is an interesting multiprotocol driver with 10uA Iq in shutdown. Expensive (and big unless you use the TSSOP package). about $7 Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speffKILLspaminterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Haven't used them, but I've got a datasheet on the Maxim series of low power 485/482 drivers. They have quiescent currents of: 120uA for MAX483, 487, 488, 489 230uA for MAX1487 300uA for MAX481,485,490,491 These are also slew rate limited and low input loading (up to 128 devices on bus). Harold On Thu, 7 Mar 2002 23:01:04 -0300 Edson Brusque <.....ebrusqueKILLspam.....TERRA.COM.BR> writes: {Quote hidden}> Hello, > > I always used 75176 RS485 drivers on my products, but they uses > more > than 20mA when outputs are disabled. This is way more than I like. > > What are you using when you need low power consumption? > > Best regards, > > Brusque > > ----------------------------------------------------------------- > Edson Brusque C.I.Tronics Lighting Designers Ltda > Researcher and Developer Blumenau - SC - Brazil > Say NO to HTML mail http://www.citronics.com.br > ----------------------------------------------------------------- > > -- > http://www.piclist.com hint: To leave the PICList > EraseMEpiclist-unsubscribe-requestspam_OUTTakeThisOuTmitvma.mit.edu > > FCC Rules Online at http://hallikainen.com/FccRules Lighting control for theatre and television at http://www.dovesystems.com ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: dl.http://www.juno.com/get/web/. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads