CMOS/LSTTL fan out

Howdy;

Looks like my potential DRO circuit is going to have to go with a mixed system.
In part thats due to timing, availability, and/or pricing concerns. Now my old,
perhaps I should say, ancient data says that the TTL, and LSTTL families have a
fan out of 10, i.e., that one output will drive 10 inputs, and that the old
standard CMOS chips should be kept under a fan out of 50. The families I'll be
going with however are 74LS TTL, and 74HC CMOS. Everything I've seen so far
says that one family will drive only one input of the other. Does anyone have
more recent fan out data for these, and what it might be for either family to
the other? I also need the under what conditions data, (pull up/down resistors,
or using buffer gates, etc.).

Thanks in advance.

Bill

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