IBIS model

soichiro kikuchi

Other Parts Discussed in Thread: SN74HC74, SN74HC14, SN74HC00, SN74AC244, SN74HCT244, CD74HC03, SN74HCT138, CD74HC4049, SN74HCT245, SN74HCT595

Though I got the answer in "CS1205357",the file format was different I expected.

I specify "XX.ibis" format.

Please answer again.

over 2 years ago

0 LeonardEllis over 2 years ago

TI__Guru 71526 points

Soichiro-san,

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

Thank you,

~Leonard

0 soichiro kikuchi over 2 years ago in reply to LeonardEllis

Prodigy 140 points

I show below.

・SN74HC74

・SN74HC14

・SN74HC00

・SN74AC244

・SN74HCT244

+1 Owen Westfall over 2 years ago in reply to soichiro kikuchi

TI__Expert 8911 points

Hi Soichiro,

For parts SN74HC74, SN74HC14, and SN74HC00 you could substitute it with the IBIS Model from CD74HC03

soichiro kikuchi said:
SN74AC244

For this part you could substitute with SN74AC245 IBIS model.

soichiro kikuchi said:
SN74HCT244

For this part you could substitute with SN74HCT245 IBIS model.

If you don't feel comfortable substituting let me know, but it will probably take me about 2 weeks to create the new ones.

Regards,

Owen

0 soichiro kikuchi over 2 years ago in reply to Owen Westfall

Prodigy 140 points

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.

+1 Owen Westfall over 2 years ago in reply to soichiro kikuchi

TI__Expert 8911 points

Hi Soichiro,

I'm sorry about that I missed the change in output type. CD74HC4049 will have push-pull output and standard cmos inputs.

Regards,

Owen

0 soichiro kikuchi over 2 years ago in reply to Owen Westfall

Prodigy 140 points

Hi Owen,

Do you have an IBIS model of SN74HCT138?

The purpose of use is the same as above.

+1 Owen Westfall over 2 years ago in reply to soichiro kikuchi

TI__Expert 8911 points

Hi Soichi,

We don't, but you can substitute it with SN74HCT165. It is TTL compatible inputs and Push-Pull outputs.

Regards,

Owen

0 soichiro kikuchi over 2 years ago in reply to Owen Westfall

Prodigy 140 points

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?

0 Owen Westfall over 2 years ago in reply to soichiro kikuchi

TI__Expert 8911 points

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

0 soichiro kikuchi over 2 years ago in reply to Owen Westfall

Prodigy 140 points

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?

0 Owen Westfall over 2 years ago in reply to soichiro kikuchi

TI__Expert 8911 points

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

0 Ryoma Ohashi over 2 years ago in reply to Owen Westfall

TI__Expert 3720 points

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

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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