SN74AVC1T45 output rise/fall time

Hello,

t(pd) depends on the operating voltage. The datasheet lists several tables of switching characteristics at different voltages for Va/Vb.

Regards,

Lo

Isn't this the propagation delay? I'm interested in the rise/fall times of the edges of the output or slew rates or fine too.

True, that's the propagation delay which can, depending on the voltages, be far above 6ns.

The maximum rise time is given in ns/V, (p.4, here 5ns/V) so it depends on your operating voltage.

That is at the input: the input transition rise/fall rate. Explained here: http://e2e.ti.com/support/logic/f/150/t/15642.aspx

I'm interested in the maximum rise/fall time of the output drivers.

Is there an answer for this question? Are these parameters specified somewhere?

May I suggest using the data rates as a guideline to reassure you that the rise/fall time is sufficiently fast?

Although the rise and fall time depend on the load capacitance (see page 13 on the datasheet for the test load), the front page of the datasheet says the maximum data rate achieved at different voltage translation levels.

The lowest data rate shown is 240Mbps.

Your 6ns rise/fall time corresponds to a total time period of at least 12ns, or a maximum frequency of 83MHz.

If the part can pass data at a rate of 240Mbps under the tested loading conditions, it has a frequency of at 120MHz and therefore a rise and fall time must be less than 6ns.

Please ensure the load being driven by the SN74AVC1T45 is approximately the same as the test loading condition. If the load capacitance is too high, rise/fall times will be longer.

-Brian

Ok, this is clear.