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Re: Driving optocouplers

Cross-posted to 2 groups.

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On 08/06/2015 11:16 PM, DaveC wrote:
> On 6 Aug 2015, Tim Wescott wrote
>
>> but it'll probably pull
>> the enable input down low enough.
>
> Thanks Tim. Good to know.
>
> How would I determine in future whether or not such a OC is appropriate?
> What’s the thought process?
>
> Thanks again,
> Dave
>

Many of the OCs specify if they are TTL or CMOS compatible. That would 
help as long as you know the ON/OFF voltages for the devices you are 
trying to control.

Speed is next, are you passing data or just signal levels? Data would 
require (depending on the rate) a much faster OC than something that is 
just isolating a signal to a relay, etc. In other words, what is the 
clock speed and is Rise Time important?

Hope this helps...

John :-#)#
-- 
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Thread

Driving optocouplers DaveC <not@home.cow> - 2015-08-06 22:52 -0700
  Re: Driving optocouplers Tim Wescott <tim@seemywebsite.com> - 2015-08-07 01:08 -0500
    Re: Driving optocouplers DaveC <not@home.cow> - 2015-08-06 23:16 -0700
      Re: Driving optocouplers John Robertson <spam@flippers.com> - 2015-08-06 23:53 -0700
        Re: Driving optocouplers upsidedown@downunder.com - 2015-08-07 13:03 +0300
      Re: Driving optocouplers Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2015-08-07 08:21 -0400
  Re: Driving optocouplers John Larkin <jlarkin@highlandtechnology.com> - 2015-08-07 07:17 -0700
  Re: Driving optocouplers John S <Sophi.2@invalid.org> - 2015-08-07 09:29 -0500
    Re: Driving optocouplers "Ralph Mowery" <rmowery28146@earthlink.net> - 2015-08-07 11:59 -0400
      Re: Driving optocouplers John S <Sophi.2@invalid.org> - 2015-08-07 11:17 -0500
  Re: Driving optocouplers WangoTango <Asgard24@mindspring.com> - 2015-08-07 17:59 -0400
    Re: Driving optocouplers M Philbrook <jamie_ka1lpa@charter.net> - 2015-08-07 18:49 -0400
      Re: Driving optocouplers WangoTango <Asgard24@mindspring.com> - 2015-08-10 17:42 -0400

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