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SN74LVC1G34: SN74LVC1G34 and SN74LV1T125

Part Number: SN74LVC1G34
Other Parts Discussed in Thread: SN74LV1T125, SN74AHC1G125

Hi there,

I would like to use the SN74LVC1G34 between 2 devices which communicate via UART (3.3V).

The devices will be separated by a long cable of 5 - 10 m and the max speed is 115200 bps.

My concern is the fast edges of this device. Does the device generate fast edges even for a low current drive?

Do you advise this device for this application?

How can I reduce the slew rate? Should I add a capacitor to the output or/and a ferrite?

Is the part SN74LV1T125 more suitable since the driving capability is just 8 mA which helps to reduce line reflections, overshoot and undershoot?

Kind regards,


  • LVC outputs indeed generate fast edges.

    Instead of the LV1T, use the cheaper SN74AHC1G125.

    The most common way to prevent ringing is to add a series resistor so that the total output impedance of the driver matches the characteristic impedance of the trace (source termination).