SN74LVT16245A: About a input signal frequency.

Kengo.Y

Guru 10710 points

Part Number: SN74LVT16245A

Hi team.

I'd like to know how much signal frequency can it input.

Can I refer to ''Input transition rise or fall rate'' in the data sheet?

∆t/∆v = 10ns/V

Input = 5V

10(ns/V) / 5(V) = 2(ns)

F(Hz) = 1 / (2(ns)* 2) = 0.25 * 10^9 = 25MHz

Is it correct ?

Sincerely.

Kengo.

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 275410 points

The rise/fall rate describes how fast the voltage changes from 0 V to 5 V, or from 5 V to 0 V, at a signal edge. This limit is a minimum, i.e., the input signal transitions must be at least that fast. This value is completely independent from the time between edges, so you cannot describe it with a frequency.

Digital inputs must have either a low or a high voltage to be valid. This limit prevents the voltage being in an invalid range for too long; see [FAQ] How does a slow or floating input affect a CMOS device?

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SN74LVT16245A: About a input signal frequency.