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Wired OR
Posted: Sat Jul 11, 2015 3:09 am
by TomasL
I am trying to do some design where I need to tie several outputs together, using wired-or technology
I am using ECL hence Open Emiter, and by default all inputs is pulled down to low with resistors.
Now it seems that all output symbols only can have two states High or Low, is it possible to create an output that can have High and High-Z instead.
Re: Wired OR
Posted: Sat Jul 11, 2015 11:26 am
by admin
Hi,
Of course, it’s possible. There are two tristate elements available for you they are between Not and And elements.
Re: Wired OR
Posted: Sat Jul 18, 2015 10:56 am
by TomasL
Well, Tristate is not what I am, looking for, since they require an extra control-signal.
Re: Wired OR
Posted: Sat Jul 18, 2015 11:33 am
by admin
Is it what you are looking for?
- High-HighZ.Jpeg (4.22 KiB) Viewed 15160 times
Please look at the circuit attached
The dash in the probe means high impedance.
Re: Wired OR
Posted: Mon Jul 20, 2015 9:47 am
by TomasL
Ok, that might be usable, what happens to the inputs when the connected outputs is HiZ, are they pulled low by default.
Re: Wired OR
Posted: Mon Jul 20, 2015 11:08 am
by admin
It the same as just disconnect the input. For And it treated as 1 for Or as 0.
Re: Wired OR
Posted: Mon Jul 20, 2015 11:28 am
by TomasL
Ok, so in the ORgate the input is pulled low.