SN74LVC1T45: when uart TX 3.3V level shift to 5.0V，then overshoot and undershoot is large.how to impove it.

user6323669

Prodigy 20 points

Part Number: SN74LVC1T45
Other Parts Discussed in Thread: SN74LV1T34

the waveform as below：

the schematic circuit diagram as below：

over 5 years ago

0 user6323669 over 5 years ago

Prodigy 20 points

the schematic circuit diagram as below：

0 Clemens Ladisch over 5 years ago

Guru 318920 points

You could reduce the ringing with a level shifter that has weaker output drivers, like the SN74LV1T34. But the ringing is caused by signal reflections on the trace, so you should properly terminate the output; see page 1-27 of the LVC Designer's Guide.

Logic

Logic forum

SN74LVC1T45: when uart TX 3.3V level shift to 5.0V，then overshoot and undershoot is large.how to impove it.