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'[EE]: Low current RS485 drivers'
2002\03\07@210409 by Edson Brusque

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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

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2002\03\07@224707 by Jinx

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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

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2002\03\07@232744 by Ashley Roll

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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.

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> {Original Message removed}

2002\03\08@020206 by Spehro Pefhany

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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"
speffspamKILLspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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2002\03\08@115543 by Harold M Hallikainen
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       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 <.....ebrusqueKILLspamspam.....TERRA.COM.BR>
writes:
{Quote hidden}

FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com


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