SN74LVC3G34: Oscillation at the output

Antony Lin

Part Number: SN74LVC3G34

Hi,

Customer is using SN74LVC3G34DCTR with schematics as below now with R69=0Ohm, C55=0.01uF

They tried to measure input and output with waveform plots as below. You can see some oscillation at the output signal. The questions here would be:

THanks!

Antony

0 Emrys Maier over 7 years ago

Hi Antony,

This input signal is absolutely too slow for a CMOS input, and the oscillations are definitely expected behavior.

This is one of our most commonly asked questions, which is answered in our Logic FAQ.

Use this button at the top right of the logic forum to reach our FAQ (or click this image):

On this page, the section you want is "Input Parameters" and the specific question is regarding input transition rates:

Logic forum