Little logic jitter

What voltage and what drive strength do you need?

In general, you get the smallest jitter with a device that has the smalled possible propagation delay. So you probably want a buffer from the AUC family, or AUP1T/LVC for higher voltages.

Thanks for your reply.

The TCXO supply is 3.3V:

LVCMOS Output (Square Wave)
VOH 2.4 V Min @ Output Load=15pF
VOL 0.4 V Output Max @ Load=15pF
Duty Cycle 45 min 55 max % @( VOH - VOL)/2
Rise/Fall Time 6 ns Max @ Output Load=15pF

It looks like the minimum propagation delay choices are SN74AUC1GU04 and SN74LVC1GU04.

I will AC couple the inverter's output to a few hundred ohms in series with the grounded primary of a 1:1 impedance broadband rf transformer whose secondary is terminated in 100 ohms. The peak current should be less than 10mA. The TCXO frequency will be either 10MHz or 25MHz.

Will the SN74AUC1GU04, supplied by 3.3V, be OK to use in this arrangement?

Thanks,

Mark

The SN74AUC1GU04 must not be supplied with 3.3 V. It can tolerate 3.3 V at its inputs, but the maximum supply voltage is 2.5 V.
And when driving 10 mA, its volage drop would probably be too high.

The SN74LVC1GU04 at 3.3 V works, if you assume that your TCXO's output actually is LVCMOS (if the V_OH value were correct, it would indicate LVTTL).

Thanks for your reply.

To overcome the TCXO output swing issue would it be acceptable to AC couple the TCXO to an SN74LVC1GU04 with a resistor (~100K?) from its output to its input?

Would this arrangement degrade jitter performance?

Regards,

Mark

Is there actually an output swing issue? Does the unloaded output go up to 3.3 V?

How exactly would you use a resistor for AC coupling?