SN74LVC1T45: Alternative Level translator for SN74LVC1T45

The LSF uses passive switches; it is not a buffer.

The output waveforms in your other thread look OK. What exactly is the problem?

At higher frequencies(up to 20MHZ) I am getting overshoot problem as in the below picture.

20MHZ OUTPUT

20MHZ Input Signal

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I know that the input waveform is not correct form, but can you suggest any tips to reduce overshoot or ringing problems?

As long as your input conforms to the Δt/Δv specification, the waveform is OK.

Overshoot or ringing is typcially caused by the capacitive load and reflections on the output. You can add a series resistor that (together with the 1T45's output impedance) is the same as the line impedance.

Please note that the oscilloscope probe adds a certain amount of ringing.

If your voltages are not higher than 3.3 V, consider using a translator from the AVC/AXC families.

Thank you for your reply.

I have included 100R Resistor in series at the output

Thank you for your reply.

Can you suggest any specific Resistor value to include along with impedance matching resistor?. The voltages I am using are higher than the 3.3V hence I need to stick with LVC devices.

Can you recommend any other alternative devices for SN74LVC1T45?

The resistor value depends on the impedance of your trace (or whatever you have connected to the output). If you do not know it, just try several values.

I will try different resistor values. 

Can you recommend any other alternative devices for SN74LVC1T45?

In the present PCB, Input trace to the chip from the input connector is longer and the same with the output trace. I think that is also a major reason for the overshoot and ringing effect.