Re: [oc] Output loading in digital circuit

[John Sheahan <jrsheahan@optushome.com.au>]

On Wed, Apr 03, 2002 at 09:02:27AM +0800, Kenneth Hung wrote:
> It's just from the datasheet I am working on.
> No application for me as it is a usual practice for
> all companies like TI, FairChild, Phillips, IDT.
> If you want, you might take a look at www.ti.com
> and search PI74LVC245A part number and from
> there you will see what I mean the loading circuit.

ah - a tristate driver.

the resistors are necessary to measure the rate the device goes into the
high impedance state. 

if its too high in value then all you do is check the time constant
of the RC.   actually its pretty hard not to do that.

john

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