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Using SN74LVC1G17 to drive 6 foot long 50 ohm transmission line.

Other Parts Discussed in Thread: SN74LVC1G17

I intend to use this buffer for driving clock signal of 4 MHz into transmission line with 50 ohm characteristic impedance. The length of this line is 6 feet. The line termination is thevenin at the end of transmission line where I have one pull up 140 OHM to 3.3V and one pull down 140 OHM to GND. SN74LVC1G17 is powered by 3.3V regulated.

When I calculate output current I end up with +24mA and -24mA.

The chip is designed to sustain these currents but what I see on the scope is that currents are more then 50mA on transitions from low to high and high to low for about 16 nSeconds.

My question is: Is using this chip going to provide reliable operation or should I select buffer with more current driving capability?

Thanks