SN74AVC6T622: About input transition rise or fall rate

Zhe Ming Zhuang

Prodigy 20 points

Part Number: SN74AVC6T622

Dear Mr./ Mrs.

In the spec. , 5ns/V is the max value for input transition rise or fall rate.

If this parameter must be followed or there has a tolerance depends on different conditions ?

And if there has any risk that the transition rate slower than this value ? EX: oscillation

Thanks,
Jimmy

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 281890 points

Shoot-through currents, oscillations, and damage. See [FAQ] How does a slow or floating input affect a CMOS device?

The B-side inputs are Schmitt triggers (see the logic diagram on p. 5). If you put the translator near the controller (see figure 1), there should be no problem.

0 Zhe Ming Zhuang over 1 year ago in reply to Clemens Ladisch

Prodigy 20 points

Hi Clemens,

Thanks for your reply !

By the way, the transition time should be measured from 0.35VCCI (VIL) to 0.65VCCI (VIH), right ?

Thanks,
Jimmy

0 Clemens Ladisch over 1 year ago in reply to Zhe Ming Zhuang

Guru 281890 points

No. Δt/Δv measures the slope of the edge; it must no be slower than the limit at any point of the edge.

Logic

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SN74AVC6T622: About input transition rise or fall rate