[SI-LIST] Re: Curve Tracing IO pins at high state
- From: Gian YK-r58635 <yeekoy.gian@xxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 20 Nov 2003 17:33:01 +0800
Andy, Patrick, Tom and all,
This time I tried curve tracing a simple HC02(NOR gate) device to get a feel
how the curve would look like before proceeding to more complex device.
However, I am getting a similar result to what I've seen earlier. I am pretty
sure that:-
1) the curve tracer is connected to the output pin
2) I've tried changing the current scale from uA to A
Any other ideas?
Appreciate your help.
YK Gian
-----Original Message-----
From: Ingraham, Andrew [mailto:a.ingraham@xxxxxxxx]
Sent: Wednesday, November 12, 2003 2:34 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Curve Tracing IO pins at high state
You're trying to sweep an output pin that is driving high.
My guess is either: (1) you connected the curve tracer to a 5V power pin by
mistake; or (2) the current scale on the curve tracer is set much too
sensitive.
If it's set to show you nanoamps or microamps full-scale, the voltage is not
going to move noticeably from 5V. Set the curve tracer so that it shows you
at least tens of milliamps full-scale.
Regards,
Andy
> Sounds like you may have a slight current leak or resistive pullup in your
> device. The DMM, being very hi impedance will read a high. Putting the
> curve tracer on it shows no current. Try loading the output with a 1K
> resistor when using the DMM. This will tell you if you really have a
high.
...
>> I am a newbie to the world of IBIS modelling. Recently, I've tried to
curve
>> trace an I/O at a high state. When verified using a multimeter the pin
>> confirms to output high. However when I try to curve trace this
particular
>> pin, I get a dead straight line at 5V (Vdd is powered at 5V). Where did I
go
>> wrong?
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