SN74CBTLV3257: Controlling FET Switch Mux IBIS Model in Hyperlynx SI

Thomas Jamison

Part Number: SN74CBTLV3257

Tool/software:

I've simulated the CBT series FET switch IBIS models just fine, but I am using a FET Switch MUX, and I do not understand how to control the mux select function. It appears to default to the A setting, and I need to simulate the B setting.

1 month ago

0 Clemens Ladisch 1 month ago

Guru 262870 points

IBIS models cannot simulate such functionality.

Anyway, the A and B switches have the same electrical characteristics.

0 Thomas Jamison 1 month ago in reply to Clemens Ladisch

Prodigy 10 points

Sure the mux has the same characteristics on both A and B, but my PC board has completely different trace routes on A and B. Hence the need to simulate B.

I see in the IDT version of the model there appears to be a mechanism, but I still don't see how to control it:

[Series Switch Groups]
|Function Group States
On A /
On B /
Off A B /

I'll keep looking.

0 Thomas Jamison 1 month ago in reply to Thomas Jamison

Prodigy 10 points

OK, It looks like the question was already answered, I just didn't see it when I first looked.

SN74CBTLV3257: IBIS model setting

Thanks!

Switches & multiplexers

Switches & multiplexers forum

SN74CBTLV3257: Controlling FET Switch Mux IBIS Model in Hyperlynx SI

SN74CBTLV3257: IBIS model setting