SN74AVC4T245: output jitter

Naizeng Wang

Part Number: SN74AVC4T245

Tool/software:

Hi team,

Below is the transimition waveform. The blue curve is input, the red curve is output. But you can find there is jitter on output. Could you please explain the waveform? Is it caused by the slow input slew rate?

2 days ago

0 Clemens Ladisch 2 days ago

Guru 317350 points

The slow edge of the input signal violates the specified Δt/Δv limit.

A buffer with Schmitt-trigger input can clean up the signal. But I guess there is a reason why the circuit slows it down to begin with.

0 Joshua Salinas 2 days ago

TI__Mastermind 23560 points

Hello Naizeng,

I agree with Clemens. The reason why your output is oscillating is due to slow input transitions. See FAQ below for more information:

[FAQ] How does a slow or floating input affect a CMOS device?

Regards,

Josh

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SN74AVC4T245: output jitter