At 04:13 PM 8/7/01 +1200, you wrote:

>I think you could be a bit more generous with the capacitance. A
>single HC series input is typically 50-100pF.

This is high by 10:1. Here, check it out (Cin, page 3):
http://www.fairchildsemi.com/ds/MM/MM74HC00.pdf

Best regards,
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