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Re: PSpice Logic Levels

Jim Thomps>> >>

>>> Jim Thomps>>>> Along the lines of the question regarding LTspice logic levels... >>>> >>>> PSpice has a number of nice digital stimulus "parts", but they kick >>>> out _very_fast_ edges at 0-5V logic levels when connected to analog >>>> parts. >>>> >>> Can't you set trise and tfall as one can in LTSpice? I just didn't know >>> where but one kind reader and Helmut explained it. >> >> I think they were talking of _sources_. I'm talking of interfaces >> between digital and analog, so that the extensive _stimulus_ tools can >> be used at the device level. >> >>> >>>> So, in this past week, I have created some stimulus-level-to-analog >>>> parts with adjustable levels and rise and fall. >>>> >>>> Likewise analog back to 5V logic. >>>> >>>> That way I can patch in 74HC stuff just for behavioral analysis... >>>> speeds things up before I go full device-level in the chip design. >>>> >>> I wish the behaviorals could have Rdson in there. But I guess one can't >>> have everything in life. Well, at least my flu is gone except for a >>> hacking cough so I'm happy. >>> >>> >>>> Any PSpice users that are interested, I'll send you copies for your >>>> symbol libraries... PSpice Schematics only... Capture sucks the big >>>> lemon ;-) >>>> >>> So what's your favorite schematic entry tool du jour? Meantime I kicked >>> the tires on some of them. Big ones like Bartels BAE, small ones like >>> TinyCad etc., but wasn't too enthused. Then again the BAE is probably >>> more geared towards chip designers and high-density digital. >>> >>> If Eagle offered a hierarchical sheet structure I'd say. But it doesn't :-( >> >> Ancient, but VERY user-friendly, PSpice Schematics does hierarchical >> designs far better than OrCAD Capture. >> > >OrCad SDT was very good. I am more and more tempted to go back to that. >None of the "new and improved" high-faluting Windows CAD packages has >ever reached its robustness. > >But I want to change only one more time because every time you switch >it's new libraries, new schematic file formats, new everything.

OrCAD SDT can _easily_ be converted to PSpice Schematics; and PSpice Schematics can be relatively easily converted to Capture... as long as you are aware of the potential netlisting anomalies.

...Jim Thompson

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| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     et      |
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Jim Thompson
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Yes, I remember going from SDT to PSpice with ease although back then I entered Spice via a text editor. Main reason was that my first laptop used less power when not in graphics mode so the battery would last. In the 80's/90's laptops had a really useful battery lifetime.

I wonder how many people and maybe companies stuck to this old DSO-OrCad. The Yahoo group appeared to be very paltry last time I checked.

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Regards, Joerg

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Joerg

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