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LT SPICE need help

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Parth86

Member
Hello
Just I have downloaded LT spice software. I am beginner. I tried to make circuit. Can someone tell me how to set correct parameters for d flip flop. I wanted to see timing diagram LT spice.png
 

Daniel Wood

Member
Right click on the flip flop to open the component attribute editor.
In there, goto SpiceLine and enter the following string

Vhigh 5 Trise 1u Tfall 1u

This will set the flip flop to 5v.. The rise/fall time to 1 microsecond.

There are more parameters you can add but this is the bare minimum you would need to get things running =]
 

ronsimpson

Well-Known Member
Most Helpful Member
Vead,
Save and attached you file and one of us can help more. (.ASC)
I think you want to see the wave forms. Push the button that looks like a man running. Then hold the cursor over the wire "output". Click.
I think you need to set up V1 and V2.
 

Parth86

Member
Vead,
Save and attached you file and one of us can help more. (.ASC)
I think you want to see the wave forms. Push the button that looks like a man running. Then hold the cursor over the wire "output". Click.
I think you need to set up V1 and V2.
I have attached my file.
 

Attachments

ronsimpson

Well-Known Member
Most Helpful Member
Down load dff-ron.
Push run (man running button)
click on Q, D, CLOCK.
I changed your V1 and V2 so the on voltage is 0.9 and 0.95 so it is easy to see on the graph.
I named the nets with names like "D" so it is easy in my head.
upload_2016-9-12_9-54-42.png
 

Attachments

Parth86

Member
Hello
Thank you for helping me, but when I run your file. I get different result I think I am doing something wrong
dff.jpg
 

ronsimpson

Well-Known Member
Most Helpful Member
There is a keystroke that I can not remember......
-Right click on .RAW window.
-Add Plot Plain---click
-move mouse to new area---click
-move mouse to .ASC window and click on net. (wire, trace,)
upload_2016-9-12_12-54-55.png
 

Parth86

Member
Hello
I am looking 74ls163 simulation model. I have downloaded lib part 1, part2, and part 3 From LTspice yahoo group. I don't see model for 74ls163. Also please tell me how to add components in LTspice directory.
 

Gatonegro

New Member
Right click on the flip flop to open the component attribute editor.
In there, goto SpiceLine and enter the following string

Vhigh 5 Trise 1u Tfall 1u

This will set the flip flop to 5v.. The rise/fall time to 1 microsecond.
There are more parameters you can add but this is the bare minimum you would need to get things running =]
Great tip- I tried setting both Vhigh and clock V to 5 and to 1 volt. Both worked. Thank you
 
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