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For external clock source, which PAD is the best choice?

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Jerry Yau

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clock pad

Sir,
Followings are TSMC 0.35 I/O PAD, I would like to know which one the the best choice for external clock signal generated by a 48MHz Oscillator:
PDCHxSM : Very Fast Schmitt Trigger Non-Inverting Clock Input Pad,5V-Tolerant, Connecting VDD5V Power Ring
PDCHxSZ : High Drive, Schmitt Trigger Input Clock Pad, 5V-Tolerant
PDCHxTZ : High Drive, TTL Input Clock Pad, 5V-Tolerant
PDCxTZ : Very Fast TTL Non-Inverting Clock Driver, 5V-Tolerant
PDIM : Input Pad, 5V-Tolerant, Connecting VDD5V Power Ring
PDISM : Schmitt Trigger Input Pad, 5V-Tolerant, Connecting VDD5V Power

PDCHxSM,PDCHxSZ,PDCHxTZ need 2 PAD windows. Others just need one PAD windows.
And chip is PAD limit

Thanks
 

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