IBIS model

Soichiro-san,

Please specify what device you are requesting the ibis model for.

Thank you,

~Leonard  

I show below.

・SN74HC74

・SN74HC14

・SN74HC00

・SN74AC244

・SN74HCT244

Hi Owen,

CD74HC03 requires a pull-up resistor to change the output to Hi/Low.

Do you have models  that can be substituted without a pull-up resistor?

The purpose is to predict overshoot/undershoots.

So the drive ability to equal a model is desirable.

Hi Owen,

Do you have an IBIS model of SN74HCT138?

The purpose of use is the same as above.

Hi Owen,

I tried to use IBIS models shown below.

・CD74HC4049

・SN74HCT245

But they didn't move I expected. I show below the part of use.

model：HC4049_OUT_50

Model_type：output

model：HCT245_IO

Model_type：I/O

Would you check them correct?

Hi Soichiro,

I'm sorry that these seemed to have errors while I check them out you could try SN74HCT595 to replace HCT245_IO. As for HC4049_OUT_50 we don't appear to have any other HC family devices with push-pull outputs models. Could you explain more clearly why it isn't what you would expect?

Regards,

Owen

FIG.pdf

Hi Owen,

SN74HCT595 moved I expected.I created a chart of the data from IBIS models.

I attach them to this thread. Is glaph of HC4049 correct? 

Hi Soichi,

Here's what I see on the IBIS model.

It looks very similar to what you showed. Could you explain in more detail what you say you're expecting versus what the IBIS is showing?

Regards,

Owen

Hi Owen

I have started a new thread about this issue in the logic forum.

"CD74HC4049: IBIS model: HC4049_OUT_50"

Could you move to the new thread and reply to that question?

Regards,

Ohashi